Annotations: 9SQN

Structure of a disulfide-bridged complex between HLA-A*02:01-K127N/Y84C and ERp57/tapasin-K16C - State 1

External Resource: Annotation

Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Protein Modification Annotation

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A [auth B]	PF07654	Immunoglobulin C1-set domain (C1-set)	Immunoglobulin C1-set domain		Domain
B [auth D]	PF07654	Immunoglobulin C1-set domain (C1-set)	Immunoglobulin C1-set domain		Domain
C [auth E]	PF13848	Thioredoxin-like domain (Thioredoxin_6)	Thioredoxin-like domain		Domain
C [auth E]	PF00085	Thioredoxin (Thioredoxin)	Thioredoxin	Thioredoxins are small enzymes that participate in redox reactions, via the reversible oxidation of an active centre disulfide bond. Some members with only the active site are not separated from the noise.	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A [auth B]	Beta-2-microglobulin	binding antigen binding peptide antigen binding peptide binding protein-containing complex binding MHC protein complex binding MHC class II protein complex binding identical protein binding protein binding protein homodimerization activity protein dimerization activity structural molecule activity	intracellular iron ion homeostasis inorganic ion homeostasis cellular homeostasis chemical homeostasis homeostatic process intracellular monoatomic cation homeostasis monoatomic ion homeostasis intracellular chemical homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains multicellular organismal process regulation of immune effector process lymphocyte mediated immunity intracellular iron ion homeostasis inorganic ion homeostasis cellular homeostasis chemical homeostasis homeostatic process intracellular monoatomic cation homeostasis monoatomic ion homeostasis intracellular chemical homeostasis monoatomic cation homeostasis intracellular monoatomic ion homeostasis adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains multicellular organismal process regulation of immune effector process lymphocyte mediated immunity T cell mediated immunity positive regulation of leukocyte mediated immunity regulation of cellular process response to stimulus T cell cytokine production positive regulation of macromolecule biosynthetic process positive regulation of metabolic process positive regulation of immune response cytokine production leukocyte mediated immunity regulation of immune system process positive regulation of macromolecule metabolic process positive regulation of adaptive immune response positive regulation of T cell cytokine production positive regulation of immune system process regulation of T cell mediated immunity regulation of biological process regulation of cytokine production involved in immune response immune response regulation of adaptive immune response immune effector process regulation of gene expression regulation of leukocyte mediated immunity biosynthetic process regulation of response to stimulus positive regulation of production of molecular mediator of immune response positive regulation of multicellular organismal process regulation of immune response metabolic process regulation of macromolecule biosynthetic process macromolecule metabolic process regulation of production of molecular mediator of immune response positive regulation of cytokine production regulation of metabolic process positive regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains positive regulation of lymphocyte mediated immunity positive regulation of biological process positive regulation of response to stimulus regulation of T cell cytokine production regulation of adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains positive regulation of biosynthetic process regulation of cytokine production positive regulation of immune effector process regulation of multicellular organismal process cytokine production involved in immune response positive regulation of cellular process production of molecular mediator of immune response regulation of biosynthetic process biological regulation regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process adaptive immune response regulation of lymphocyte mediated immunity positive regulation of gene expression immune system process positive regulation of T cell mediated immunity positive regulation of cytokine production involved in immune response cellular process cellular response to stimulus cellular response to iron ion cellular response to metal ion cellular response to chemical stimulus response to metal ion response to iron ion response to chemical regulation of localization import into cell regulation of cellular component organization transport negative regulation of biological process negative regulation of transport negative regulation of endocytosis vesicle-mediated transport cellular component organization localization negative regulation of cellular process cellular component organization or biogenesis regulation of endocytosis negative regulation of cellular component organization negative regulation of receptor-mediated endocytosis regulation of transport regulation of receptor-mediated endocytosis regulation of vesicle-mediated transport establishment of localization endocytosis receptor-mediated endocytosis positive regulation of cellular component organization positive regulation of endocytosis positive regulation of receptor-mediated endocytosis positive regulation of transport peptide antigen assembly with MHC class I protein complex protein-containing complex organization peptide antigen assembly with MHC protein complex MHC class I protein complex assembly cellular component biogenesis antigen processing and presentation cellular component assembly protein-containing complex assembly antigen processing and presentation of peptide antigen via MHC class I MHC protein complex assembly antigen processing and presentation of peptide antigen regulation of developmental process cellular developmental process cell development regulation of cell differentiation regulation of neurogenesis regulation of cell development regulation of nervous system development negative regulation of neurogenesis multicellular organism development neurogenesis cell differentiation anatomical structure development negative regulation of nervous system development negative regulation of cell differentiation system development developmental process regulation of multicellular organismal development negative regulation of developmental process nervous system development negative regulation of cell development negative regulation of multicellular organismal process animal gross anatomical part developmental process regulation of defense response regulation of response to biotic stimulus biological process involved in interspecies interaction between organisms regulation of response to external stimulus response to biotic stimulus response to stress regulation of response to stress innate immune response response to external biotic stimulus natural killer cell mediated immunity regulation of natural killer cell mediated immunity response to other organism defense response regulation of innate immune response defense response to symbiont response to external stimulus defense response to other organism antigen processing and presentation of peptide antigen via MHC class Ib antigen processing and presentation via MHC class Ib antigen processing and presentation of exogenous peptide antigen via MHC class Ib antigen processing and presentation of exogenous peptide antigen antigen processing and presentation of exogenous antigen negative regulation of cell population proliferation cell population proliferation regulation of cell population proliferation regulation of epithelial cell proliferation epithelial cell proliferation negative regulation of epithelial cell proliferation establishment of protein localization iron ion transport metal ion transport protein transport macromolecule localization transferrin transport transition metal ion transport monoatomic ion transport intracellular protein localization monoatomic cation transport system process sensory perception of chemical stimulus sensory perception nervous system process sensory perception of smell primary metabolic process protein metabolic process supramolecular fiber organization amyloid fibril formation protein homotetramerization protein complex oligomerization protein tetramerization protein homooligomerization antigen processing and presentation of exogenous peptide antigen via MHC class II antigen processing and presentation of peptide or polysaccharide antigen via MHC class II antigen processing and presentation of peptide antigen via MHC class II peptide antigen assembly with MHC class II protein complex MHC class II protein complex assembly cellular response to nicotine response to nicotine regulation of cellular senescence cellular senescence positive regulation of cellular senescence cellular response to stress antigen processing and presentation of endogenous peptide antigen antigen processing and presentation of endogenous antigen antigen processing and presentation of endogenous peptide antigen via MHC class I behavior learning or memory cognition negative regulation of monoatomic ion transport regulation of monoatomic ion transport regulation of iron ion transport regulation of metal ion transport negative regulation of iron ion transport regulation of leukocyte activation regulation of cell activation positive regulation of leukocyte cell-cell adhesion lymphocyte activation leukocyte cell-cell adhesion leukocyte activation positive regulation of cell-cell adhesion positive regulation of lymphocyte activation positive regulation of cell activation cell adhesion cell-cell adhesion T cell activation positive regulation of leukocyte activation regulation of cell-cell adhesion positive regulation of T cell activation positive regulation of cell adhesion regulation of cell adhesion cell activation regulation of T cell activation regulation of leukocyte cell-cell adhesion regulation of lymphocyte activation negative regulation of forebrain neuron differentiation forebrain development regulation of forebrain neuron differentiation central nervous system neuron differentiation neuron differentiation head development forebrain generation of neurons animal organ development brain development generation of neurons central nervous system development forebrain neuron differentiation negative regulation of neuron differentiation regulation of neuron differentiation	cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle vesicle cell periphery cellular anatomical structure cell surface membrane plasma membrane external side of plasma membrane side of membrane extracellular exosome membrane-bounded organelle extracellular vesicle extracellular organelle extracellular region organelle vesicle extracellular membrane-bounded organelle protein-containing complex plasma membrane protein complex plasma membrane signaling receptor complex membrane protein complex signaling receptor complex HFE-transferrin receptor complex MHC class I protein complex MHC protein complex endosome membrane intracellular anatomical structure endosome intracellular vesicle late endosome membrane intracellular membrane-bounded organelle endomembrane system intracellular organelle cytoplasmic vesicle membrane bounding membrane of organelle cytoplasmic vesicle vesicle membrane late endosome cytoplasm organelle membrane phagocytic vesicle phagocytic vesicle membrane endocytic vesicle membrane endocytic vesicle vacuolar membrane lytic vacuole vacuole lytic vacuole membrane lysosomal membrane lysosome Golgi apparatus membrane-enclosed lumen intracellular organelle lumen endoplasmic reticulum lumen organelle lumen endoplasmic reticulum Golgi membrane MHC class I peptide loading complex organelle subcompartment endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum protein-containing complex endoplasmic reticulum membrane vesicle lumen cytoplasmic vesicle lumen secretory granule lumen specific granule lumen secretory granule secretory vesicle specific granule anchoring junction cell junction focal adhesion cell-substrate junction MHC class II protein complex early endosome endosome lumen early endosome lumen recycling endosome recycling endosome membrane tertiary granule lumen tertiary granule early endosome membrane transport vesicle transport vesicle membrane coated vesicle membrane COPII-coated ER to Golgi transport vesicle ER to Golgi transport vesicle membrane coated vesicle
B [auth D]	Tapasin	binding antigen binding peptide antigen binding peptide binding protein-containing complex binding MHC protein complex binding MHC class I protein complex binding TAP1 binding TAP binding protein binding TAP complex binding molecular adaptor activity MHC class I protein binding signaling receptor binding binding antigen binding peptide antigen binding peptide binding protein-containing complex binding MHC protein complex binding MHC class I protein complex binding TAP1 binding TAP binding protein binding TAP complex binding molecular adaptor activity MHC class I protein binding signaling receptor binding MHC protein binding protein folding chaperone TAP2 binding	cellular component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein-containing complex assembly cellular process cellular component organization or biogenesis regulation of protein complex stability biological regulation regulation of biological quality regulation of biosynthetic process regulation of biological process regulation of cellular process regulation of macromolecule metabolic process cellular component organization cellular component biogenesis cellular component assembly protein-containing complex organization protein-containing complex assembly cellular process cellular component organization or biogenesis regulation of protein complex stability biological regulation regulation of biological quality regulation of biosynthetic process regulation of biological process regulation of cellular process regulation of macromolecule metabolic process gene expression macromolecule biosynthetic process regulation of gene expression biosynthetic process regulation of macromolecule biosynthetic process metabolic process macromolecule metabolic process regulation of metabolic process localization transport retrograde vesicle-mediated transport, Golgi to endoplasmic reticulum establishment of localization Golgi vesicle transport vesicle-mediated transport peptide stabilization antigen processing and presentation peptide antigen stabilization immune system process antigen processing and presentation of peptide antigen peptide metabolic process antigen processing and presentation of endogenous peptide antigen antigen processing and presentation of peptide antigen via MHC class I antigen processing and presentation of endogenous antigen antigen processing and presentation of endogenous peptide antigen via MHC class I peptide antigen assembly with MHC class I protein complex peptide antigen assembly with MHC protein complex MHC class I protein complex assembly MHC protein complex assembly MHC class Ib protein complex assembly	membrane-bounded organelle intracellular anatomical structure organelle subcompartment membrane intracellular membrane-bounded organelle endomembrane system endoplasmic reticulum subcompartment intracellular organelle cellular anatomical structure organelle nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum cytoplasm organelle membrane membrane-bounded organelle intracellular anatomical structure organelle subcompartment membrane intracellular membrane-bounded organelle endomembrane system endoplasmic reticulum subcompartment intracellular organelle cellular anatomical structure organelle nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum cytoplasm organelle membrane endoplasmic reticulum membrane lumenal side of endoplasmic reticulum membrane side of membrane lumenal side of membrane intracellular vesicle phagocytic vesicle phagocytic vesicle membrane cytoplasmic vesicle membrane bounding membrane of organelle cytoplasmic vesicle vesicle membrane endocytic vesicle membrane vesicle endocytic vesicle Golgi membrane Golgi apparatus endoplasmic reticulum-Golgi intermediate compartment membrane endoplasmic reticulum-Golgi intermediate compartment protein-containing complex MHC class I peptide loading complex membrane protein complex endoplasmic reticulum protein-containing complex
C [auth E]	Protein disulfide-isomerase A3	RNA binding binding lncRNA binding nucleic acid binding phosphoric ester hydrolase activity phospholipase activity hydrolase activity, acting on ester bonds phosphoric diester hydrolase activity glycerophospholipase activity hydrolase activity C-type glycerophospholipase activity catalytic activity lipase activity cysteine-type peptidase activity RNA binding binding lncRNA binding nucleic acid binding phosphoric ester hydrolase activity phospholipase activity hydrolase activity, acting on ester bonds phosphoric diester hydrolase activity glycerophospholipase activity hydrolase activity C-type glycerophospholipase activity catalytic activity lipase activity cysteine-type peptidase activity peptidase activity catalytic activity, acting on a protein cysteine-type endopeptidase activity endopeptidase activity isomerase activity intramolecular oxidoreductase activity intramolecular oxidoreductase activity, transposing S-S bonds protein disulfide isomerase activity oxidoreductase activity, acting on a sulfur group of donors disulfide oxidoreductase activity oxidoreductase activity protein-disulfide reductase activity protein folding chaperone identical protein binding protein binding	response to stimulus immune response immune system process adaptive immune response protein folding biosynthetic process metabolic process cellular process primary metabolic process protein metabolic process macromolecule metabolic process gene expression macromolecule biosynthetic process protein maturation response to stimulus immune response immune system process adaptive immune response protein folding biosynthetic process metabolic process cellular process primary metabolic process protein metabolic process macromolecule metabolic process gene expression macromolecule biosynthetic process protein maturation protein folding in endoplasmic reticulum peptide antigen assembly with MHC class I protein complex protein-containing complex organization peptide antigen assembly with MHC protein complex MHC class I protein complex assembly cellular component organization cellular component biogenesis antigen processing and presentation cellular component assembly protein-containing complex assembly antigen processing and presentation of peptide antigen via MHC class I MHC protein complex assembly cellular component organization or biogenesis antigen processing and presentation of peptide antigen cellular response to stimulus cellular response to stress response to stress response to endoplasmic reticulum stress	cellular anatomical structure anchoring junction cell junction focal adhesion cell-substrate junction membrane-bounded organelle intracellular anatomical structure pigment granule intracellular vesicle intracellular membrane-bounded organelle intracellular organelle melanosome cytoplasmic vesicle organelle cellular anatomical structure anchoring junction cell junction focal adhesion cell-substrate junction membrane-bounded organelle intracellular anatomical structure pigment granule intracellular vesicle intracellular membrane-bounded organelle intracellular organelle melanosome cytoplasmic vesicle organelle cytoplasm vesicle extracellular exosome extracellular vesicle extracellular organelle extracellular region extracellular membrane-bounded organelle cell surface phagocytic vesicle endocytic vesicle endosome membrane membrane endosome recycling endosome endomembrane system cytoplasmic vesicle membrane bounding membrane of organelle recycling endosome membrane vesicle membrane organelle membrane membrane-enclosed lumen intracellular organelle lumen endoplasmic reticulum lumen organelle lumen endoplasmic reticulum protein-containing complex MHC class I peptide loading complex organelle subcompartment membrane protein complex endoplasmic reticulum subcompartment nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum protein-containing complex endoplasmic reticulum membrane nucleus
D [auth A]	MHC class I antigen	-	response to stimulus immune response immune system process antigen processing and presentation antigen processing and presentation of peptide antigen via MHC class I antigen processing and presentation of peptide antigen	membrane-bounded organelle intracellular anatomical structure organelle subcompartment membrane lumenal side of endoplasmic reticulum membrane intracellular membrane-bounded organelle endomembrane system side of membrane lumenal side of membrane endoplasmic reticulum subcompartment intracellular organelle cellular anatomical structure organelle nuclear outer membrane-endoplasmic reticulum membrane network membrane-bounded organelle intracellular anatomical structure organelle subcompartment membrane lumenal side of endoplasmic reticulum membrane intracellular membrane-bounded organelle endomembrane system side of membrane lumenal side of membrane endoplasmic reticulum subcompartment intracellular organelle cellular anatomical structure organelle nuclear outer membrane-endoplasmic reticulum membrane network endoplasmic reticulum cytoplasm organelle membrane endoplasmic reticulum membrane intracellular vesicle phagocytic vesicle phagocytic vesicle membrane cytoplasmic vesicle membrane bounding membrane of organelle cytoplasmic vesicle vesicle membrane endocytic vesicle membrane vesicle endocytic vesicle endosome membrane endosome recycling endosome recycling endosome membrane Golgi membrane Golgi apparatus early endosome early endosome membrane cell surface MHC class I protein complex MHC protein complex cell periphery protein-containing complex plasma membrane protein complex plasma membrane membrane protein complex transport vesicle transport vesicle membrane coated vesicle membrane COPII-coated ER to Golgi transport vesicle ER to Golgi transport vesicle membrane coated vesicle
E [auth C]	LYS-ILE-LEU-GLY-PHE-VAL-NFA, pKV9	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth B]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
A [auth B]	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site
A [auth B]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A [auth B]	IPR007110	Immunoglobulin-like domain	Domain
A [auth B]	IPR050160	Major Histocompatibility Complex/Immunoglobulin	Family
A [auth B]	IPR003597	Immunoglobulin C1-set	Domain
A [auth B]	IPR015707	Beta-2-Microglobulin	Family
B [auth D]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
B [auth D]	IPR003597	Immunoglobulin C1-set	Domain
B [auth D]	IPR008056	Tapasin	Family
B [auth D]	IPR050380	Immune Recognition and Response Modulators	Family
B [auth D]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
B [auth D]	IPR007110	Immunoglobulin-like domain	Domain
C [auth E]	IPR017937	Thioredoxin, conserved site	Conserved Site
C [auth E]	IPR005788	Protein disulfide-isomerase, thioredoxin-like domain	Domain
C [auth E]	IPR005792	Protein disulphide isomerase	Family
C [auth E]	IPR013766	Thioredoxin domain	Domain
C [auth E]	IPR041868	Protein disulfide-isomerase A3, first redox inactive TRX-like domain b	Domain
C [auth E]	IPR036249	Thioredoxin-like superfamily	Homologous Superfamily
D [auth A]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
D [auth A]	IPR050208	Antigen-presenting and immune regulatory MHC class I-related	Family
D [auth A]	IPR037055	MHC class I-like antigen recognition-like superfamily	Homologous Superfamily
D [auth A]	IPR003597	Immunoglobulin C1-set	Domain
D [auth A]	IPR010579	MHC class I, alpha chain, C-terminal	Domain
D [auth A]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
D [auth A]	IPR011161	MHC class I-like antigen recognition-like	Domain
D [auth A]	IPR011162	MHC classes I/II-like antigen recognition protein	Homologous Superfamily
D [auth A]	IPR007110	Immunoglobulin-like domain	Domain
D [auth A]	IPR001039	MHC class I alpha chain, alpha1 alpha2 domains	Domain
D [auth A]	IPR003006	Immunoglobulin/major histocompatibility complex, conserved site	Conserved Site

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
E [auth C]	NH2	: AA0081 , AA0083 , AA0084 , AA0086 , AA0087 , AA0088 , AA0090 , AA0091 , AA0092 , AA0093 , AA0095 , AA0096 , AA0097 , AA0098 , AA0099 , AA0100 : L-alanine amide MOD:00090 , L-asparagine amide MOD:00092 , L-aspartic acid 1-amide MOD:00093 , L-glutamine amide MOD:00095 , L-glutamic acid 1-amide MOD:00096 , glycine amide MOD:00097 , L-isoleucine amide MOD:00099 , L-leucine amide MOD:00100 , L-lysine amide MOD:00101 , L-methionine amide MOD:00102 , L-proline amide MOD:00104 , L-serine amide MOD:00105 , L-threonine amide MOD:00106 , L-tryptophan amide MOD:00107 , L-tyrosine amide MOD:00108 , L-valine amide MOD:00109

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RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.

9SQN | pdb_00009sqn

Structure of a disulfide-bridged complex between HLA-A*02:01-K127N/Y84C and ERp57/tapasin-K16C - State 1

External Resource: Annotation

Protein Family Annotation Pfam Database Homepage

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

InterPro: Protein Family Classification InterPro Database Homepage

Protein Modification Annotation