1QAB

The structure of human retinol binding protein with its carrier protein transthyretin reveals interaction with the carboxy terminus of RBP


Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilyTransthyretin (synonym: prealbumin) 8040289 3000848 SCOP2B (2022-06-29)
BSCOP2B SuperfamilyTransthyretin (synonym: prealbumin) 8040289 3000848 SCOP2B (2022-06-29)
CSCOP2B SuperfamilyTransthyretin (synonym: prealbumin) 8040289 3000848 SCOP2B (2022-06-29)
DSCOP2B SuperfamilyTransthyretin (synonym: prealbumin) 8040289 3000848 SCOP2B (2022-06-29)
ESCOP2B SuperfamilyLipocalins 8042583 3001332 SCOP2B (2022-06-29)
FSCOP2B SuperfamilyLipocalins 8042583 3001332 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ATransthyretine1qabA1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Prealbumin-likeF: TransthyretinECOD (1.6)
BTransthyretine1qabB1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Prealbumin-likeF: TransthyretinECOD (1.6)
CTransthyretine1qabC1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Prealbumin-likeF: TransthyretinECOD (1.6)
DTransthyretine1qabD1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Prealbumin-likeF: TransthyretinECOD (1.6)
ELipocalin_2e1qabE1 A: beta barrelsX: Lipocalins/StreptavidinH: Lipocalins (From Topology)T: LipocalinsF: Lipocalin_2ECOD (1.6)
FLipocalin_2e1qabF1 A: beta barrelsX: Lipocalins/StreptavidinH: Lipocalins (From Topology)T: LipocalinsF: Lipocalin_2ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B, C, D
PF00576HIUase/Transthyretin family (Transthyretin)HIUase/Transthyretin familyThis family includes transthyretin that is a thyroid hormone-binding protein that transports thyroxine from the bloodstream to the brain. However, most of the sequences listed in this family do not bind thyroid hormones. They are actually enzymes of ...This family includes transthyretin that is a thyroid hormone-binding protein that transports thyroxine from the bloodstream to the brain. However, most of the sequences listed in this family do not bind thyroid hormones. They are actually enzymes of the purine catabolism that catalyse the conversion of 5-hydroxyisourate (HIU) to OHCU [2,3]. HIU hydrolysis is the original function of the family and is conserved from bacteria to mammals; transthyretins arose by gene duplications in the vertebrate lineage [4]. HIUases are distinguished in the alignment from the conserved C-terminal YRGS sequence.
Domain
E, F
PF00061Lipocalin / cytosolic fatty-acid binding protein family (Lipocalin)Lipocalin / cytosolic fatty-acid binding protein familyLipocalins are transporters for small hydrophobic molecules, such as lipids, steroid hormones, bilins, and retinoids. The family also encompasses the enzyme prostaglandin D synthase (EC:5.3.99.2). Alignment subsumes both the lipocalin and fatty acid ...Lipocalins are transporters for small hydrophobic molecules, such as lipids, steroid hormones, bilins, and retinoids. The family also encompasses the enzyme prostaglandin D synthase (EC:5.3.99.2). Alignment subsumes both the lipocalin and fatty acid binding protein signatures from PROSITE. This is supported on structural and functional grounds. The structure is an eight-stranded beta barrel.
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B, C, D
PROTEIN (transthyretin)
E, F
PROTEIN (retinol binding protein)

Pharos: Disease Associations Pharos Homepage Annotation

ChainsDrug Target  Associated Disease
A, B, C, D
PharosP02766
E, F
PharosP02753