AC MF_01531; DC Protein; auto TR HAMAP; MF_01531; -; 1; level=0 XX Names: BtuB XX ID BTUB DE RecName: Full=Vitamin B12 transporter BtuB; DE AltName: Full=Cobalamin receptor; DE AltName: Full=Outer membrane cobalamin translocator; DE Flags: Precursor; GN Name=btuB; XX CC -!- FUNCTION: Involved in the active translocation of vitamin B12 CC (cyanocobalamin) across the outer membrane to the periplasmic space. It CC derives its energy for transport by interacting with the trans- CC periplasmic membrane protein TonB. CC -!- SUBCELLULAR LOCATION: Cell outer membrane; Multi-pass membrane protein. CC -!- SIMILARITY: Belongs to the TonB-dependent receptor family. BtuB (TC CC 1.B.14.3.1) subfamily. XX DR Pfam; PF00593; TonB_dep_Rec; 1; trigger=no DR NCBIfam; TIGR01779; TonB-B12; 1; trigger=no DR PROSITE; PS00430; TONB_DEPENDENT_REC_1; 1; trigger=no DR PROSITE; PS01156; TONB_DEPENDENT_REC_2; 1; trigger=no DR PROSITE; PS52016; TONB_DEPENDENT_REC_3; 1; trigger=yes DR General; Signal; -; 1; trigger=yes XX case KW Calcium KW Metal-binding end case KW Ion transport KW Membrane KW Cell outer membrane KW Porin KW Signal KW TonB box KW Transmembrane KW Transmembrane beta strand KW Transport XX GO GO:0090482; F:vitamin transmembrane transporter activity GO GO:0015889; P:cobalamin transport GO GO:0009279; C:cell outer membrane XX FT From: BTUB_ECOLI (P06129) case FT TRANSMEM 158..165 FT /note="Beta stranded" FT TRANSMEM 169..178 FT /note="Beta stranded" FT TRANSMEM 184..195 FT /note="Beta stranded" FT TRANSMEM 217..227 FT /note="Beta stranded" FT TRANSMEM 232..248 FT /note="Beta stranded" FT TRANSMEM 263..277 FT /note="Beta stranded" FT TRANSMEM 279..296 FT /note="Beta stranded" FT TRANSMEM 309..325 FT /note="Beta stranded" FT TRANSMEM 328..337 FT /note="Beta stranded" FT TRANSMEM 353..369 FT /note="Beta stranded" FT TRANSMEM 371..381 FT /note="Beta stranded" FT TRANSMEM 385..400 FT /note="Beta stranded" FT TRANSMEM 403..417 FT /note="Beta stranded" FT TRANSMEM 434..443 FT /note="Beta stranded" FT TRANSMEM 449..458 FT /note="Beta stranded" FT TRANSMEM 473..490 FT /note="Beta stranded" FT TRANSMEM 494..509 FT /note="Beta stranded" FT TRANSMEM 517..529 FT /note="Beta stranded" FT TRANSMEM 535..550 FT /note="Beta stranded" FT TRANSMEM 558..572 FT /note="Beta stranded" FT TRANSMEM 585..596 FT /note="Beta stranded" FT TRANSMEM 602..614 FT /note="Beta stranded" FT BINDING 110..111 FT /ligand="cyanocob(III)alamin" FT /ligand_id="ChEBI:CHEBI:17439" FT Condition: [VIGL]-[ST] FT BINDING 83 FT /ligand="cyanocob(III)alamin" FT /ligand_id="ChEBI:CHEBI:17439" FT Optional; Condition: L FT BINDING 85 FT /ligand="cyanocob(III)alamin" FT /ligand_id="ChEBI:CHEBI:17439" FT Condition: [ST] FT BINDING 92 FT /ligand="cyanocob(III)alamin" FT /ligand_id="ChEBI:CHEBI:17439" FT Condition: N FT BINDING 251 FT /ligand="cyanocob(III)alamin" FT /ligand_id="ChEBI:CHEBI:17439" FT Condition: [ASG] FT BINDING 309 FT /ligand="cyanocob(III)alamin" FT /ligand_id="ChEBI:CHEBI:17439" FT Condition: [TS] FT BINDING 517 FT /ligand="cyanocob(III)alamin" FT /ligand_id="ChEBI:CHEBI:17439" FT Condition: R FT BINDING 551 FT /ligand="cyanocob(III)alamin" FT /ligand_id="ChEBI:CHEBI:17439" FT Condition: [YF] FT MOTIF 26..33 FT /note="TonB box" FT MOTIF 597..614 FT /note="TonB C-terminal box" FT BINDING 199 FT /ligand="Ca(2+)" FT /ligand_id="ChEBI:CHEBI:29108" FT /ligand_label="1" FT Condition: [DN] FT BINDING 211 FT /ligand="Ca(2+)" FT /ligand_id="ChEBI:CHEBI:29108" FT /ligand_label="1" FT Condition: Q FT BINDING 213 FT /ligand="Ca(2+)" FT /ligand_id="ChEBI:CHEBI:29108" FT /ligand_label="1" FT Condition: D FT BINDING 213 FT /ligand="Ca(2+)" FT /ligand_id="ChEBI:CHEBI:29108" FT /ligand_label="2" FT Condition: D FT BINDING 215 FT /ligand="Ca(2+)" FT /ligand_id="ChEBI:CHEBI:29108" FT /ligand_label="1" FT Condition: D FT BINDING 215 FT /ligand="Ca(2+)" FT /ligand_id="ChEBI:CHEBI:29108" FT /ligand_label="2" FT Condition: D FT BINDING 249 FT /ligand="Ca(2+)" FT /ligand_id="ChEBI:CHEBI:29108" FT /ligand_label="2" FT Condition: Y FT BINDING 250 FT /ligand="Ca(2+)" FT /ligand_id="ChEBI:CHEBI:29108" FT /ligand_label="1" FT Condition: D FT BINDING 250 FT /ligand="Ca(2+)" FT /ligand_id="ChEBI:CHEBI:29108" FT /ligand_label="2" FT Condition: D FT BINDING 261 FT /ligand="Ca(2+)" FT /ligand_id="ChEBI:CHEBI:29108" FT /ligand_label="2" FT Condition: D end case case not FT MOTIF 26..33 FT /note="TonB box" FT MOTIF 597..614 FT /note="TonB C-terminal box" end case XX Size: 606-625; Related: None; Template: P06129; Scope: Bacteria; Gammaproteobacteria Fusion: Nter: None Cter: None Duplicate: None Plasmid: None Comments: None XX # Revision 1.35 2023/06/01 //