3BSZ | pdb_00003bsz

Crystal structure of the transthyretin-retinol binding protein-Fab complex


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)
G [auth L]SCOP2B SuperfamilyImmunoglobulin (Ig) domain-like 8091539 3000071 SCOP2B (2022-06-29)
I [auth M]SCOP2B SuperfamilyImmunoglobulin (Ig) domain-like 8091539 3000071 SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
ATransthyretine3bszA1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Prealbumin-likeF: TransthyretinECOD (1.6)
BTransthyretine3bszB1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Prealbumin-likeF: TransthyretinECOD (1.6)
CTransthyretine3bszC1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Prealbumin-likeF: TransthyretinECOD (1.6)
DTransthyretine3bszD1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Prealbumin-likeF: TransthyretinECOD (1.6)
ELipocalin_2e3bszE1 A: beta barrelsX: Lipocalins/StreptavidinH: Lipocalins (From Topology)T: LipocalinsF: Lipocalin_2ECOD (1.6)
FLipocalin_2e3bszF1 A: beta barrelsX: Lipocalins/StreptavidinH: Lipocalins (From Topology)T: LipocalinsF: Lipocalin_2ECOD (1.6)
G [auth L]C1-set_4e3bszL2 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Immunoglobulin/Fibronectin type III/E set domains/PapD-likeF: C1-set_4ECOD (1.6)
G [auth L]V-sete3bszL1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Immunoglobulin/Fibronectin type III/E set domains/PapD-likeF: V-setECOD (1.6)
I [auth M]C1-set_4e3bszM2 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Immunoglobulin/Fibronectin type III/E set domains/PapD-likeF: C1-set_4ECOD (1.6)
I [auth M]V-sete3bszM1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Immunoglobulin/Fibronectin type III/E set domains/PapD-likeF: V-setECOD (1.6)
HV-set_8e3bszH1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Immunoglobulin/Fibronectin type III/E set domains/PapD-likeF: V-set_8ECOD (1.6)
HC1-set_1e3bszH2 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Immunoglobulin/Fibronectin type III/E set domains/PapD-likeF: C1-set_1ECOD (1.6)
J [auth N]V-set_8e3bszN1 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Immunoglobulin/Fibronectin type III/E set domains/PapD-likeF: V-set_8ECOD (1.6)
J [auth N]C1-set_1e3bszN2 A: beta sandwichesX: Immunoglobulin-like beta-sandwichH: Immunoglobulin-relatedT: Immunoglobulin/Fibronectin type III/E set domains/PapD-likeF: C1-set_1ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

IMGT Antibody Annotation IMGT Database Homepage

ChainProtein NameDescriptionOrganism NameGene Allele Name(s)Domain Name(s)Receptor TypeReceptor DescriptionProvenance Source
G [auth L],
I [auth M]
Anti-RBP Fab L-KAPPA Mus musculus (house mouse) IGKV3-5*01, IGKJ1*02, IGKJ2*01, IGKC*01, IGKC*02 V-DOMAIN V-KAPPA, C-DOMAIN C-KAPPA IG FAB-GAMMA-1_KAPPA IMGT (202531-0)
H,
J [auth N]
Anti-RBP Fab VH-CH1 Mus musculus (house mouse) IGHV1-5*01, IGHJ1*01, IGHJ1*02, IGHJ1*03, IGHG1*01 V-DOMAIN VH, C-DOMAIN CH1 IG FAB-GAMMA-1_KAPPA IMGT (202531-0)

SAbDab Antibody Annotation SAbDab Database Homepage

ChainChain ClassChain SubclassChain TypeAntigen Name(s) Provenance Source
G [auth L],
I [auth M]
Light ChainIGKV3 Kappaplasma retinol-binding proteinSAbDab (2025-08-15)
H,
J [auth N]
Heavy ChainIGHV1 -plasma retinol-binding proteinSAbDab (2025-08-15)

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
G [auth L],
I [auth M]
PF07686Immunoglobulin V-set domain (V-set)Immunoglobulin V-set domainThis domain is found in antibodies as well as neural protein P0 and CTL4 amongst others. Domain
G [auth L],
I [auth M]
PF07654Immunoglobulin C1-set domain (C1-set)Immunoglobulin C1-set domainDomain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B, C, D
Transthyretin
E, F
Plasma retinol-binding protein
G [auth L],
I [auth M]
Fab fragment heavy chain-
H,
J [auth N]
Fab fragment light chain---

InterPro: Protein Family Classification InterPro Database Homepage

ChainsAccessionNameType
A, B, C, D
IPR036817Transthyretin/hydroxyisourate hydrolase domain superfamilyHomologous Superfamily
A, B, C, D
IPR023418Transthyretin, thyroxine binding siteBinding Site
A, B, C, D
IPR023419Transthyretin, conserved siteConserved Site
A, B, C, D
IPR023416Transthyretin/hydroxyisourate hydrolase domainDomain
A, B, C, D
IPR000895Transthyretin/hydroxyisourate hydrolaseFamily
E, F
IPR012674CalycinHomologous Superfamily
E, F
IPR000566Lipocalin/cytosolic fatty-acid binding domainDomain
E, F
IPR022272Lipocalin family conserved siteConserved Site
E, F
IPR022271Lipocalin, ApoD typeFamily
E, F
IPR002449Retinol binding protein/PurpurinFamily
G [auth L],
I [auth M]
IPR050150Immunoglobulin Variable Light ChainFamily
G [auth L],
I [auth M]
IPR013783Immunoglobulin-like foldHomologous Superfamily
G [auth L],
I [auth M]
IPR036179Immunoglobulin-like domain superfamilyHomologous Superfamily
G [auth L],
I [auth M]
IPR013106Immunoglobulin V-set domainDomain
G [auth L],
I [auth M]
IPR003599Immunoglobulin domain subtypeDomain
G [auth L],
I [auth M]
IPR007110Immunoglobulin-like domainDomain
G [auth L],
I [auth M]
IPR003597Immunoglobulin C1-setDomain
G [auth L],
I [auth M]
IPR013783Immunoglobulin-like foldHomologous Superfamily
G [auth L],
I [auth M]
IPR036179Immunoglobulin-like domain superfamilyHomologous Superfamily
G [auth L],
I [auth M]
IPR007110Immunoglobulin-like domainDomain
G [auth L],
I [auth M]
IPR050380Immune Recognition and Response ModulatorsFamily
G [auth L],
I [auth M]
IPR003006Immunoglobulin/major histocompatibility complex, conserved siteConserved Site

Pharos: Disease Associations Pharos Homepage Annotation

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