Annotations: 7URX

SJ25C1 Fab in complex with soluble CD19

External Resource: Annotation

Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
C [auth H]	PH	e7urxH1	A: beta barrels	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: PH	ECOD (v294.2)
B [auth L]	PH	e7urxL1	A: beta barrels	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: PH	ECOD (v294.2)
A [auth C]	PH	e7urxC1	A: beta barrels	X: RNase A-like	H: Cytochrome P450	T: Cytochrome P450	F: PH	ECOD (v294.2)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
C [auth H]	Heavy Chain	IGHV1	-	b-lymphocyte antigen cd19	SAbDab (2026-05-08)
B [auth L]	Light Chain	IGKV6	Kappa	b-lymphocyte antigen cd19	SAbDab (2026-05-08)

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
C [auth H]	SJ25C1 Fab heavy chain	-	-	-
B [auth L]	SJ25C1 Fab light chain	-	-	-
A [auth C]	B-lymphocyte antigen CD19	-	multicellular organismal process cell population proliferation B cell activation cell activation B cell proliferation lymphocyte activation leukocyte proliferation leukocyte activation mononuclear cell proliferation immune system process lymphocyte proliferation cellular process adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity multicellular organismal process cell population proliferation B cell activation cell activation B cell proliferation lymphocyte activation leukocyte proliferation leukocyte activation mononuclear cell proliferation immune system process lymphocyte proliferation cellular process adaptive immune response based on somatic recombination of immune receptors built from immunoglobulin superfamily domains lymphocyte mediated immunity response to stimulus immune response B cell mediated immunity leukocyte mediated immunity immunoglobulin mediated immune response adaptive immune response immune effector process cellular response to stimulus immune response-regulating cell surface receptor signaling pathway regulation of cellular process signaling positive regulation of biological process cell communication positive regulation of response to stimulus immune response-activating signaling pathway immune response-regulating signaling pathway positive regulation of immune response regulation of immune system process signal transduction positive regulation of immune system process regulation of biological process cell surface receptor signaling pathway immune response-activating cell surface receptor signaling pathway B cell receptor signaling pathway biological regulation regulation of response to stimulus regulation of immune response antigen receptor-mediated signaling pathway activation of immune response developmental process cellular developmental process hemopoiesis cell development mononuclear cell differentiation mature B cell differentiation lymphocyte differentiation B-1 B cell differentiation B cell differentiation cell differentiation anatomical structure development leukocyte differentiation regulation of calcium ion transport regulation of localization positive regulation of cation transmembrane transport positive regulation of calcium ion transport transport monoatomic ion transmembrane transport regulation of monoatomic ion transmembrane transport calcium ion transport metal ion transport regulation of calcium ion transmembrane transport monoatomic cation transmembrane transport localization intercellular transport positive regulation of monoatomic ion transport positive regulation of calcium ion transmembrane transport positive regulation of transmembrane transport monoatomic ion transport positive regulation of monoatomic ion transmembrane transport positive regulation of release of sequestered calcium ion into cytosol monoatomic cation transport regulation of metal ion transport positive regulation of cellular process calcium ion transmembrane import into cytosol regulation of transport regulation of release of sequestered calcium ion into cytosol regulation of monoatomic ion transport establishment of localization transmembrane transport release of sequestered calcium ion into cytosol regulation of transmembrane transport positive regulation of transport regulation of monoatomic cation transmembrane transport calcium ion transmembrane transport B cell proliferation involved in immune response B cell activation involved in immune response cell activation involved in immune response leukocyte activation involved in immune response lymphocyte activation involved in immune response regulation of leukocyte activation regulation of cell activation regulation of B cell activation regulation of multicellular organismal process regulation of lymphocyte activation positive regulation of cell communication regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction positive regulation of signal transduction regulation of signal transduction intracellular signal transduction regulation of intracellular signal transduction intracellular signaling cassette regulation of signaling positive regulation of intracellular signal transduction positive regulation of phosphatidylinositol 3-kinase/protein kinase B signal transduction regulation of cell communication phosphatidylinositol 3-kinase/protein kinase B signal transduction positive regulation of signaling regulation of B cell receptor signaling pathway regulation of antigen receptor-mediated signaling pathway	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 membrane microdomain membrane raft protein-containing complex

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A [auth C]	IPR042341	B-lymphocyte antigen CD19	Family
A [auth C]	IPR036179	Immunoglobulin-like domain superfamily	Homologous Superfamily
A [auth C]	IPR013783	Immunoglobulin-like fold	Homologous Superfamily
A [auth C]	IPR003599	Immunoglobulin domain subtype	Domain
A [auth C]	IPR007110	Immunoglobulin-like domain	Domain

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A [auth C]	: P15391	agammaglobulinemia common variable immunodeficiency immunodeficiency, common variable, 3 lymphatic system disease neuromyelitis optica Pre B-cell acute lymphoblastic leukemia tuberculosis anemia B cell deficiency bone marrow disease diffuse large B-cell lymphoma immunodeficiency, common variable, 2 interstitial cystitis osteosarcoma Sjogren syndrome agammaglobulinemia common variable immunodeficiency immunodeficiency, common variable, 3 lymphatic system disease neuromyelitis optica Pre B-cell acute lymphoblastic leukemia tuberculosis anemia B cell deficiency bone marrow disease diffuse large B-cell lymphoma immunodeficiency, common variable, 2 interstitial cystitis osteosarcoma Sjogren syndrome ulcerative colitis arthritic joint disease B-cell neoplasm cancer leukopenia nasopharyngeal carcinoma periodontitis skin disease autoimmune disease bipolar disorder

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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.