ID   LAMB_PHOPR              Reviewed;         418 AA.
AC   Q6LPY5;
DT   12-JUN-2007, integrated into UniProtKB/Swiss-Prot.
DT   12-JUN-2007, sequence version 2.
DT   25-MAY-2022, entry version 87.
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=PBPRA2255;
OS   Photobacterium profundum (strain SS9).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Vibrionales; Vibrionaceae;
OC   Photobacterium.
OX   NCBI_TaxID=298386;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=ATCC BAA-1253 / SS9;
RX   PubMed=15746425; DOI=10.1126/science.1103341;
RA   Vezzi A., Campanaro S., D'Angelo M., Simonato F., Vitulo N., Lauro F.M.,
RA   Cestaro A., Malacrida G., Simionati B., Cannata N., Romualdi C.,
RA   Bartlett D.H., Valle G.;
RT   "Life at depth: Photobacterium profundum genome sequence and expression
RT   analysis.";
RL   Science 307:1459-1461(2005).
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=CAG20641.1; Type=Erroneous initiation; Evidence={ECO:0000305};
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DR   EMBL; CR378670; CAG20641.1; ALT_INIT; Genomic_DNA.
DR   AlphaFoldDB; Q6LPY5; -.
DR   SMR; Q6LPY5; -.
DR   STRING; 298386.PBPRA2255; -.
DR   EnsemblBacteria; CAG20641; CAG20641; PBPRA2255.
DR   KEGG; ppr:PBPRA2255; -.
DR   eggNOG; COG4580; Bacteria.
DR   HOGENOM; CLU_032473_4_1_6; -.
DR   Proteomes; UP000000593; Chromosome 1.
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..26
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
FT   CHAIN           27..418
FT                   /note="Maltoporin"
FT                   /id="PRO_0000290222"
FT   SITE            33
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            165
FT                   /note="Important in sugar transport"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
FT   SITE            379
FT                   /note="Greasy slide, important in sugar transport"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
FT   SITE            417
FT                   /note="Greasy slide, important in sugar transport"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01301"
SQ   SEQUENCE   418 AA;  46122 MW;  1FC79740B7E05DEC CRC64;
     MLPMNRNTLG LAVTIATVFV SSTVTAEVDF HGYVRAGIGI SGENGQQVRY QSNKVGRLGN
     EDDLYSEILL GKELYSQDGK SFYVDSMMAL LSDGSNDFEG TNTSCELLKN SAGDVDDVSC
     DNDAEFAIRQ FNVQAKGLIP SNPDAVSWAG KRYYQRHDIH ISDFYYWDTS GSGAGVENLS
     VGTGKLSLAV LRQDSGDINV NNFDIRYAEI ALWQDANLEL GFNYGLINET DAQKAEVGED
     PLMLTAEITM ANVIGGLNKT IFQYATESYG EQMAGLGAGN SPDATSDDGI DGYRIINWGV
     IAPTKTWEIG HQIVYANSSF DSQDDHSIFN VVVRPMYKWD ENMRTVFEGG WFTEEDNKVD
     SSGSKFTVAQ AWSAGSSFWA RPELRVYASY LKDYENDNAF GIGNDTEYNL GVQVEAWW