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1NQG

OUTER MEMBRANE COBALAMIN TRANSPORTER (BTUB) FROM E. COLI, WITH BOUND CALCIUM

Functional Information from GO Data
ChainGOidnamespacecontents
A0005509molecular_functioncalcium ion binding
A0005515molecular_functionprotein binding
A0006811biological_processmonoatomic ion transport
A0009279cellular_componentcell outer membrane
A0015288molecular_functionporin activity
A0015420molecular_functionABC-type vitamin B12 transporter activity
A0015889biological_processcobalamin transport
A0016020cellular_componentmembrane
A0019904molecular_functionprotein domain specific binding
A0034220biological_processmonoatomic ion transmembrane transport
A0035461biological_processvitamin transmembrane transport
A0046872molecular_functionmetal ion binding
A0046930cellular_componentpore complex
A0090482molecular_functionvitamin transmembrane transporter activity
A1902495cellular_componenttransmembrane transporter complex
Functional Information from PDB Data
site_idAC1
Number of Residues5
DetailsBINDING SITE FOR RESIDUE CA A 595
ChainResidue
AASP179
AGLN191
AASP193
AASP195
AASP230

site_idAC2
Number of Residues4
DetailsBINDING SITE FOR RESIDUE CA A 596
ChainResidue
AASP193
AASP195
ATYR229
AASP230

site_idAC3
Number of Residues2
DetailsBINDING SITE FOR RESIDUE CA A 597
ChainResidue
AGLU378
AGLU381

site_idAC4
Number of Residues1
DetailsBINDING SITE FOR RESIDUE CA A 598
ChainResidue
AASP447

site_idAC5
Number of Residues10
DetailsBINDING SITE FOR RESIDUE C8E A 800
ChainResidue
AILE340
AALA357
AARG358
AARG367
AGLY369
ATHR370
ATRP371
APHE470
ATHR472
AGLY473

site_idAC6
Number of Residues6
DetailsBINDING SITE FOR RESIDUE C8E A 801
ChainResidue
ATHR338
AASP361
ASER363
ATYR383
APHE422
ATRP431

site_idAC7
Number of Residues10
DetailsBINDING SITE FOR RESIDUE C8E A 802
ChainResidue
AASN302
AVAL304
AALA313
AGLY314
AILE340
AILE433
ATHR467
AALA468
ATYR481
AC8E804

site_idAC8
Number of Residues8
DetailsBINDING SITE FOR RESIDUE C8E A 803
ChainResidue
AGLY344
ALEU345
AGLN346
APHE353
AGLY355
AALA356
ATRP371
ATHR373

site_idAC9
Number of Residues8
DetailsBINDING SITE FOR RESIDUE C8E A 804
ChainResidue
ATRP214
ATYR256
AILE261
ASER263
AASN302
ATYR436
AGLY463
AC8E802

site_idBC1
Number of Residues4
DetailsBINDING SITE FOR RESIDUE C8E A 805
ChainResidue
AALA357
ATRP371
AGLY473
APRO474

Functional Information from PROSITE/UniProt
site_idPS01156
Number of Residues18
DetailsTONB_DEPENDENT_REC_2 TonB-dependent receptor (TBDR) proteins signature 2. YgyqTaGReYtLSGsYtF
ChainResidueDetails
ATYR577-PHE594

Functional Information from SwissProt/UniProt
site_idSWS_FT_FI1
Number of Residues278
DetailsTransmembrane: {"description":"Beta stranded"}
ChainResidueDetails

site_idSWS_FT_FI2
Number of Residues82
DetailsTopological domain: {"description":"Extracellular","evidences":[{"source":"PubMed","id":"12652322","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI3
Number of Residues32
DetailsTopological domain: {"description":"Periplasmic","evidences":[{"source":"PubMed","id":"12652322","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI4
Number of Residues114
DetailsDomain: {"description":"TBDR plug","evidences":[{"source":"PROSITE-ProRule","id":"PRU01360","evidenceCode":"ECO:0000255"}]}
ChainResidueDetails

site_idSWS_FT_FI5
Number of Residues7
DetailsMotif: {"description":"TonB box"}
ChainResidueDetails

site_idSWS_FT_FI6
Number of Residues17
DetailsMotif: {"description":"TonB C-terminal box"}
ChainResidueDetails

site_idSWS_FT_FI7
Number of Residues8
DetailsBinding site: {"evidences":[{"source":"PubMed","id":"12652322","evidenceCode":"ECO:0000269"},{"source":"PDB","id":"1NQH","evidenceCode":"ECO:0007744"}]}
ChainResidueDetails

site_idSWS_FT_FI8
Number of Residues7
DetailsBinding site: {"evidences":[{"source":"PubMed","id":"12652322","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

239149

PDB entries from 2025-07-23

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