Annotations: 9Q6H

Human Serum Albumin in complex with four nanobodies: nb33, nb77, nb125 & N42

External Resource: Annotation

Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
SAbDab Antibody Annotation
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Pharos: Disease Associations

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Serum albumin-like	8033045	3001552	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Serum albumin-like	8033047	3001552	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Serum albumin-like	8033044	3001552	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	Cofilin_ADF	e9q6hA1	A: alpha arrays	X: HTH	H: HTH	T: Three-helical HTH	F: Cofilin_ADF	ECOD (v295)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
E	Heavy Chain	IGHV1	-	serum albumin	SAbDab (2026-07-31)
D	Heavy Chain	IGHV1	-	serum albumin	SAbDab (2026-07-31)
C	Heavy Chain	IGHV1	-	serum albumin	SAbDab (2026-07-31)
B	Heavy Chain	IGHV1	-	serum albumin	SAbDab (2026-07-31)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF00273	Serum albumin family (Serum_albumin)	Serum albumin family		Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
E	N42	-	-	-
D	nb125	-	-	-
C	nb77	-	-	-
B	nb33	-	-	-
A	Serum albumin	antioxidant activity vitamin binding vitamin B6 binding pyridoxal phosphate binding ion binding binding anion binding heterocyclic compound binding small molecule binding fatty acid binding organic acid binding lipid binding carboxylic acid binding monocarboxylic acid binding antioxidant activity vitamin binding vitamin B6 binding pyridoxal phosphate binding ion binding binding anion binding heterocyclic compound binding small molecule binding fatty acid binding organic acid binding lipid binding carboxylic acid binding monocarboxylic acid binding protein binding exogenous protein binding cation binding transition metal ion binding copper ion binding metal ion binding toxic substance binding macrolide binding enterobactin binding protein-folding chaperone binding DNA binding nucleic acid binding molecular carrier activity tetrapyrrole binding heme binding identical protein binding	regulation of biological process regulation of cellular process regulation of mitochondrial depolarization negative regulation of membrane depolarization biological regulation negative regulation of biological process mitochondrial depolarization regulation of membrane depolarization regulation of mitochondrial membrane potential membrane depolarization cellular process regulation of biological quality negative regulation of mitochondrial depolarization regulation of membrane potential regulation of biological process regulation of cellular process regulation of mitochondrial depolarization negative regulation of membrane depolarization biological regulation negative regulation of biological process mitochondrial depolarization regulation of membrane depolarization regulation of mitochondrial membrane potential membrane depolarization cellular process regulation of biological quality negative regulation of mitochondrial depolarization regulation of membrane potential cellular response to stimulus cellular response to nutrient levels response to nutrient levels response to stimulus cellular response to stress response to stress response to starvation cellular response to calcium ion starvation cellular response to starvation response to oxidative stress cellular response to chemical stimulus response to chemical cellular response to oxidative stress cellular response to chemical stress pigment catabolic process pigment metabolic process heme metabolic process catabolic process tetrapyrrole metabolic process heme catabolic process porphyrin-containing compound catabolic process metabolic process porphyrin-containing compound metabolic process tetrapyrrole catabolic process porphyrin-containing compound biosynthetic process heme biosynthetic process pigment biosynthetic process tetrapyrrole biosynthetic process biosynthetic process organic acid transport localization bilirubin transport nitrogen compound transport carboxylic acid transport transport dicarboxylic acid transport establishment of localization	extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle vesicle extracellular membrane-bounded organelle protein-containing complex blood microparticle intracellular anatomical structure membrane-enclosed lumen intracellular membrane-bounded organelle extracellular exosome membrane-bounded organelle extracellular vesicle cellular anatomical structure extracellular organelle extracellular region organelle vesicle extracellular membrane-bounded organelle protein-containing complex blood microparticle intracellular anatomical structure membrane-enclosed lumen intracellular membrane-bounded organelle endomembrane system intracellular organelle lumen endoplasmic reticulum lumen intracellular organelle organelle lumen endoplasmic reticulum cytoplasm vesicle lumen intracellular vesicle cytoplasmic vesicle lumen secretory granule lumen cytoplasmic vesicle secretory granule secretory vesicle platelet alpha granule platelet alpha granule lumen nucleus

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR020857	Serum albumin, conserved site	Conserved Site
A	IPR000264	ALB/AFP/VDB	Family
A	IPR014760	Serum albumin, N-terminal	Domain
A	IPR020858	Serum albumin-like	Homologous Superfamily
A	IPR021177	Serum albumin/Alpha-fetoprotein/Afamin	Family

Pharos: Disease Associations Pharos Homepage Annotation

Chains	Drug Target	Associated Disease
A	: P02768	thrombocytopenia pancreatitis Stevens-Johnson syndrome allergic disease angioedema hyperthyroxinemia, familial dysalbuminemic myopathy heart disease hemolytic-uremic syndrome adult acute respiratory distress syndrome uveitis membranous glomerulonephritis glomerulonephritis nephrotic syndrome kidney disease thrombocytopenia pancreatitis Stevens-Johnson syndrome allergic disease angioedema hyperthyroxinemia, familial dysalbuminemic myopathy heart disease hemolytic-uremic syndrome adult acute respiratory distress syndrome uveitis membranous glomerulonephritis glomerulonephritis nephrotic syndrome kidney disease HIV infectious disease echinococcosis hypertensive disorder interstitial nephritis Pain diabetic peripheral angiopathy melancholia urticaria congenital analbuminemia nephrosis serum sickness keloid hepatitis brain disease membranoproliferative glomerulonephritis cardiovascular disease cerebrovascular disorder endogenous depression anuria nephritis aseptic meningitis congestive heart failure azoospermia brain ischemia acute liver failure poisoning epilepsy chronic kidney disease proteinuria cirrhosis of liver asthma respiratory failure influenza coronary artery disease neurodegenerative disease autoimmune disease dense deposit disease non-alcoholic fatty liver disease bone marrow disease hepatitis C virus infection toxic epidermal necrolysis lymphatic system disease pancreatic intraductal papillary-mucinous neoplasm breast disease type IV hypersensitivity disease perennial allergic rhinitis cancer peritonitis Ehlers-Danlos syndrome, arthrochalasis type primary biliary cholangitis arthritic joint disease protein-energy malnutrition chronic obstructive pulmonary disease gastric neoplasm psoriasis inborn carbohydrate metabolic disorder atherosclerosis respiratory system disease inherited lipid metabolism disorder COVID-19 neurotic disorder obesity disorder diabetic kidney disease brain injury liver disease diabetic retinopathy pancreatic ductal adenocarcinoma hereditary diffuse gastric adenocarcinoma breast cancer tuberculosis pancreatic intraductal papillary-mucinous neoplasm with low grade dysplasia peripheral neuropathy hyperglycemia pneumonia muscle tissue disease esophageal varices primary membranoproliferative glomerulonephritis cholestasis protein-losing enteropathy hypotensive disorder inflammatory bowel disease heart failure dementia hepatic encephalopathy skin disease depressive disorder hepatitis B virus infection stomach disease leukopenia pancreas disease thrombotic disease lung adenocarcinoma diarrheal disease acute kidney failure pancreatic intraductal papillary-mucinous carcinoma hereditary hyperbilirubinemia breast carcinoma type 2 diabetes mellitus malignant pancreatic neoplasm C1 inhibitor deficiency urinary tract infection drug-induced liver injury peripheral vascular disease hyperparathyroidism varicose disease metabolic acidosis anemia muscular disease extrahepatic cholestasis prostate carcinoma hypoglycemia gastric cancer idiopathic membranous glomerulonephritis nephrosclerosis

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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.