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3C1H

Substrate binding, deprotonation and selectivity at the periplasmic entrance of the E. coli ammonia channel AmtB

Functional Information from GO Data
ChainGOidnamespacecontents
A0005515molecular_functionprotein binding
A0005886cellular_componentplasma membrane
A0008519molecular_functionammonium channel activity
A0015670biological_processcarbon dioxide transport
A0016020cellular_componentmembrane
A0042802molecular_functionidentical protein binding
A0072488biological_processammonium transmembrane transport
Functional Information from PDB Data
site_idAC1
Number of Residues5
DetailsBINDING SITE FOR RESIDUE ACT A 425
ChainResidue
AALA158
ALEU159
AASP160
ATYR278
AHOH509

site_idAC2
Number of Residues11
DetailsBINDING SITE FOR RESIDUE LDA A 426
ChainResidue
AHIS168
ATRP212
APHE215
ACYS312
AASP313
AHIS318
AHOH520
AILE28
APHE31
AILE110
AALA162

site_idAC3
Number of Residues5
DetailsBINDING SITE FOR RESIDUE IMD A 427
ChainResidue
AHIS100
APHE103
AGLY218
ASER219
AGLY221

Functional Information from PROSITE/UniProt
site_idPS01219
Number of Residues26
DetailsAMMONIUM_TRANSP Ammonium transporters signature. DFAGGtvVhinAAiaGLvgaYLiGkR
ChainResidueDetails
AASP160-ARG185

Functional Information from SwissProt/UniProt
site_idSWS_FT_FI1
Number of Residues236
DetailsTransmembrane: {"description":"Helical","evidences":[{"source":"PubMed","id":"15361618","evidenceCode":"ECO:0000269"},{"source":"PubMed","id":"15563598","evidenceCode":"ECO:0000269"},{"source":"PubMed","id":"17040913","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI2
Number of Residues18
DetailsTopological domain: {"description":"Cytoplasmic","evidences":[{"source":"PubMed","id":"15361618","evidenceCode":"ECO:0000269"},{"source":"PubMed","id":"15563598","evidenceCode":"ECO:0000269"},{"source":"PubMed","id":"17040913","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI3
Number of Residues62
DetailsTopological domain: {"description":"Periplasmic","evidences":[{"source":"PubMed","id":"15361618","evidenceCode":"ECO:0000269"},{"source":"PubMed","id":"15563598","evidenceCode":"ECO:0000269"},{"source":"PubMed","id":"17040913","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI4
Number of Residues1
DetailsBinding site: {"evidences":[{"source":"PubMed","id":"15361618","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI5
Number of Residues1
DetailsSite: {"description":"Important for the deprotonation of the ammonium cation","evidences":[{"source":"PubMed","id":"19278252","evidenceCode":"ECO:0000269"}]}
ChainResidueDetails

site_idSWS_FT_FI6
Number of Residues2
DetailsSite: {"description":"Twin-His motif. Important for optimum substrate conductance","evidences":[{"source":"PubMed","id":"17040913","evidenceCode":"ECO:0000305"},{"source":"PubMed","id":"23667517","evidenceCode":"ECO:0000305"},{"source":"PubMed","id":"32662768","evidenceCode":"ECO:0000305"}]}
ChainResidueDetails

site_idSWS_FT_FI7
Number of Residues1
DetailsSite: {"description":"Important for optimum substrate conductance","evidences":[{"source":"PubMed","id":"18362341","evidenceCode":"ECO:0000305"}]}
ChainResidueDetails

239492

PDB entries from 2025-07-30

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