ID   LAMB_CITK8              Reviewed;         449 AA.
AC   A8AN92;
DT   26-FEB-2008, integrated into UniProtKB/Swiss-Prot.
DT   26-FEB-2008, sequence version 2.
DT   25-MAY-2022, entry version 76.
DE   RecName: Full=Maltoporin {ECO:0000255|HAMAP-Rule:MF_01301};
DE   AltName: Full=Maltose-inducible porin {ECO:0000255|HAMAP-Rule:MF_01301};
DE   Flags: Precursor;
GN   Name=lamB {ECO:0000255|HAMAP-Rule:MF_01301}; OrderedLocusNames=CKO_03879;
OS   Citrobacter koseri (strain ATCC BAA-895 / CDC 4225-83 / SGSC4696).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Enterobacteriaceae; Citrobacter.
OX   NCBI_TaxID=290338;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-895 / CDC 4225-83 / SGSC4696;
RG   The Citrobacter koseri Genome Sequencing Project;
RA   McClelland M., Sanderson E.K., Porwollik S., Spieth J., Clifton W.S.,
RA   Latreille P., Courtney L., Wang C., Pepin K., Bhonagiri V., Nash W.,
RA   Johnson M., Thiruvilangam P., Wilson R.;
RL   Submitted (AUG-2007) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Involved in the transport of maltose and maltodextrins.
CC       {ECO:0000255|HAMAP-Rule:MF_01301}.
CC   -!- SUBUNIT: Homotrimer formed of three 18-stranded antiparallel beta-
CC       barrels, containing three independent channels. {ECO:0000255|HAMAP-
CC       Rule:MF_01301}.
CC   -!- SUBCELLULAR LOCATION: Cell outer membrane {ECO:0000255|HAMAP-
CC       Rule:MF_01301}; Multi-pass membrane protein {ECO:0000255|HAMAP-
CC       Rule:MF_01301}.
CC   -!- INDUCTION: By maltose. {ECO:0000255|HAMAP-Rule:MF_01301}.
CC   -!- SIMILARITY: Belongs to the porin LamB (TC 1.B.3) family.
CC       {ECO:0000255|HAMAP-Rule:MF_01301}.
CC   -!- SEQUENCE CAUTION:
CC       Sequence=ABV14955.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; CP000822; ABV14955.1; ALT_INIT; Genomic_DNA.
DR   AlphaFoldDB; A8AN92; -.
DR   BMRB; A8AN92; -.
DR   SMR; A8AN92; -.
DR   STRING; 290338.CKO_03879; -.
DR   EnsemblBacteria; ABV14955; ABV14955; CKO_03879.
DR   KEGG; cko:CKO_03879; -.
DR   HOGENOM; CLU_032473_4_1_6; -.
DR   Proteomes; UP000008148; Chromosome.
DR   GO; GO:0009279; C:cell outer membrane; IEA:UniProtKB-SubCell.
DR   GO; GO:0046930; C:pore complex; IEA:UniProtKB-KW.
DR   GO; GO:0042958; F:maltodextrin transmembrane transporter activity; IEA:InterPro.
DR   GO; GO:0015481; F:maltose transporting porin activity; IEA:InterPro.
DR   GO; GO:0006811; P:ion transport; IEA:UniProtKB-KW.
DR   CDD; cd01346; Maltoporin-like; 1.
DR   Gene3D; 2.40.170.10; -; 1.
DR   HAMAP; MF_01301; LamB; 1.
DR   InterPro; IPR023738; Maltoporin.
DR   InterPro; IPR003192; Porin_LamB.
DR   InterPro; IPR036998; Porin_LamB_sf.
DR   Pfam; PF02264; LamB; 1.
PE   3: Inferred from homology;
KW   Cell outer membrane; Ion transport; Membrane; Porin; Reference proteome;
KW   Signal; Sugar transport; Transmembrane; Transmembrane beta strand;
KW   Transport.
FT   SIGNAL          1..24
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
FT   CHAIN           25..449
FT                   /note="Maltoporin"
FT                   /id="PRO_0000322011"
FT   SITE            30
FT                   /note="Greasy slide, important in sugar transport"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
FT   SITE            65
FT                   /note="Greasy slide, important in sugar transport"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
FT   SITE            98
FT                   /note="Greasy slide, important in sugar transport"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
FT   SITE            142
FT                   /note="Important in sugar transport"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
FT   SITE            251
FT                   /note="Greasy slide, important in sugar transport"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
FT   SITE            390
FT                   /note="Greasy slide, important in sugar transport"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
FT   SITE            448
FT                   /note="Greasy slide, important in sugar transport"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
SQ   SEQUENCE   449 AA;  50401 MW;  756A665FA20F9C65 CRC64;
     MITLRKLPLA VAVAAGVMSA QAMAVDFHGY ARSGIGWTGS GGEQQCFQAT GAQSKYRLGN
     ECETYAELKL GQEVWKEGDK SFYFDTNVAY SVAQQNDWEA TDPAFREANV QGKNLIDWLP
     GSTIWAGKRF YQRHDVHMID FYYWDISGPG AGIENIDLGF GKLSLAATRS QEAGGSYTFS
     SQDIYNSSKD TANDVFDVRL AGLETNPDGV LELGVDYGRA NTTDDYRLAD GASKDGWMFT
     AEHTQSMLKG YNKFVVQYAT DAMTTQGKGI PQGSYGSTFD IGEGDDQLHY VDRYVNNNGK
     LWRILDHGAI SLGDRWDLMY VGMFQKQDLD NDLGTDWWTV GVRPMFKWTP IMSTLLEVGY
     DNVKSQQTGD RNNQYKITLA QQWQAGDSIW SRPAIRLFAT YAKWDEKWGY IKDGDNTLRY
     AASNNSGFNT TSRGDNDEWS FGAQMEIWW