Annotations: 9Q6Z

Human Serum Albumin in complex with four nanobodies: N33, nb139, nb39 & nb104

External Resource: Annotation

Domain Annotation: SCOP2 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	8033047	3001552	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Serum albumin-like	8033045	3001552	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	Serum albumin-like	8033044	3001552	SCOP2B (2022-06-29)

SAbDab Antibody Annotation SAbDab Database Homepage

Chain	Chain Class	Chain Subclass	Chain Type	Antigen Name(s)	Provenance Source
B	Heavy Chain	IGHV1	-	serum albumin	SAbDab (2026-05-29)
C	Heavy Chain	IGHV1	-	serum albumin	SAbDab (2026-05-29)
D	Heavy Chain	IGHV1	-	serum albumin	SAbDab (2026-05-29)
E	Heavy Chain	IGHV1	-	serum albumin	SAbDab (2026-05-29)

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
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 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 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 organelle intracellular anatomical structure Golgi apparatus 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 organelle intracellular anatomical structure Golgi apparatus cytoplasm intracellular membrane-bounded organelle endomembrane system membrane-enclosed lumen intracellular organelle lumen endoplasmic reticulum lumen organelle lumen endoplasmic reticulum vesicle lumen intracellular vesicle cytoplasmic vesicle lumen secretory granule lumen cytoplasmic vesicle secretory granule secretory vesicle platelet alpha granule platelet alpha granule lumen nucleus
B	N33	-	-	-
C	nb139	-	-	-
D	nb39	-	-	-
E	nb104	-	-	-

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

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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.