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2BBC

Structure of Cobalamin-complexed Bovine Transcobalamin in trigonal crystal form

Functional Information from GO Data
ChainGOidnamespacecontents
A0005576cellular_componentextracellular region
A0005615cellular_componentextracellular space
A0006811biological_processmonoatomic ion transport
A0006824biological_processcobalt ion transport
A0015889biological_processcobalamin transport
A0031419molecular_functioncobalamin binding
A0046872molecular_functionmetal ion binding
Functional Information from PDB Data
site_idAC1
Number of Residues6
DetailsBINDING SITE FOR RESIDUE CL A 415
ChainResidue
AB120
ATYR229
ATHR267
AGLN269
AASN270
AGLN394

site_idAC2
Number of Residues6
DetailsBINDING SITE FOR RESIDUE CL A 416
ChainResidue
ASER370
ALEU372
AGLY373
AARG356
APHE357
AARG358

site_idAC3
Number of Residues3
DetailsBINDING SITE FOR RESIDUE CL A 417
ChainResidue
AARG108
AGLN112
AARG115

site_idAC4
Number of Residues37
DetailsBINDING SITE FOR RESIDUE B12 A 0
ChainResidue
AGLY85
AGLN86
ATHR134
ATYR137
AGLN138
AHIS175
AASP179
AASN227
ATYR229
ASER230
AASN270
AMET273
AGLN276
ASER362
ALEU363
ASER364
AGLY365
APRO366
APHE367
ALEU368
APHE381
ATRP382
AGLN383
AVAL384
ALEU392
AGLN393
AGLY395
ATRP414
ACL415
AHOH424
AHOH430
AHOH444
AHOH449
AHOH452
AHOH457
AHOH514
AHOH558

Functional Information from PROSITE/UniProt
site_idPS00468
Number of Residues14
DetailsCOBALAMIN_BINDING Eukaryotic cobalamin-binding proteins signature. SVDTMAMAgMAFSC
ChainResidueDetails
ASER177-CYS190

Functional Information from SwissProt/UniProt
site_idSWS_FT_FI1
Number of Residues4
DetailsBINDING: BINDING => ECO:0000269|PubMed:16537422, ECO:0000269|PubMed:17943552
ChainResidueDetails
AGLN86
AASN227
ASER230
AGLN276

site_idSWS_FT_FI2
Number of Residues2
DetailsBINDING:
ChainResidueDetails
ATHR134
ATRP382

site_idSWS_FT_FI3
Number of Residues1
DetailsBINDING: axial binding residue
ChainResidueDetails
AHIS175

site_idSWS_FT_FI4
Number of Residues1
DetailsCARBOHYD: N-linked (GlcNAc...) asparagine => ECO:0000255
ChainResidueDetails
AASN76

237423

PDB entries from 2025-06-11

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