ID   LPXB_HAHCH              Reviewed;         396 AA.
AC   Q2SBR1;
DT   31-OCT-2006, integrated into UniProtKB/Swiss-Prot.
DT   24-JAN-2006, sequence version 1.
DT   25-MAY-2022, entry version 77.
DE   RecName: Full=Lipid-A-disaccharide synthase {ECO:0000255|HAMAP-Rule:MF_00392};
DE            EC=2.4.1.182 {ECO:0000255|HAMAP-Rule:MF_00392};
GN   Name=lpxB {ECO:0000255|HAMAP-Rule:MF_00392}; OrderedLocusNames=HCH_05238;
OS   Hahella chejuensis (strain KCTC 2396).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Oceanospirillales;
OC   Hahellaceae; Hahella.
OX   NCBI_TaxID=349521;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=KCTC 2396;
RX   PubMed=16352867; DOI=10.1093/nar/gki1016;
RA   Jeong H., Yim J.H., Lee C., Choi S.-H., Park Y.K., Yoon S.H., Hur C.-G.,
RA   Kang H.-Y., Kim D., Lee H.H., Park K.H., Park S.-H., Park H.-S., Lee H.K.,
RA   Oh T.K., Kim J.F.;
RT   "Genomic blueprint of Hahella chejuensis, a marine microbe producing an
RT   algicidal agent.";
RL   Nucleic Acids Res. 33:7066-7073(2005).
CC   -!- FUNCTION: Condensation of UDP-2,3-diacylglucosamine and 2,3-
CC       diacylglucosamine-1-phosphate to form lipid A disaccharide, a precursor
CC       of lipid A, a phosphorylated glycolipid that anchors the
CC       lipopolysaccharide to the outer membrane of the cell.
CC       {ECO:0000255|HAMAP-Rule:MF_00392}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=a lipid X + a UDP-2-N,3-O-bis[(3R)-3-hydroxyacyl]-alpha-D-
CC         glucosamine = a lipid A disaccharide + H(+) + UDP;
CC         Xref=Rhea:RHEA:67828, ChEBI:CHEBI:15378, ChEBI:CHEBI:58223,
CC         ChEBI:CHEBI:137748, ChEBI:CHEBI:176338, ChEBI:CHEBI:176343;
CC         EC=2.4.1.182; Evidence={ECO:0000255|HAMAP-Rule:MF_00392};
CC   -!- PATHWAY: Bacterial outer membrane biogenesis; LPS lipid A biosynthesis.
CC       {ECO:0000255|HAMAP-Rule:MF_00392}.
CC   -!- SIMILARITY: Belongs to the LpxB family. {ECO:0000255|HAMAP-
CC       Rule:MF_00392}.
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DR   EMBL; CP000155; ABC31913.1; -; Genomic_DNA.
DR   RefSeq; WP_011398977.1; NC_007645.1.
DR   AlphaFoldDB; Q2SBR1; -.
DR   SMR; Q2SBR1; -.
DR   STRING; 349521.HCH_05238; -.
DR   CAZy; GT19; Glycosyltransferase Family 19.
DR   EnsemblBacteria; ABC31913; ABC31913; HCH_05238.
DR   KEGG; hch:HCH_05238; -.
DR   eggNOG; COG0763; Bacteria.
DR   HOGENOM; CLU_036577_3_0_6; -.
DR   OMA; PTVWAWR; -.
DR   OrthoDB; 1258510at2; -.
DR   UniPathway; UPA00973; -.
DR   Proteomes; UP000000238; Chromosome.
DR   GO; GO:0008915; F:lipid-A-disaccharide synthase activity; IEA:UniProtKB-UniRule.
DR   GO; GO:0009245; P:lipid A biosynthetic process; IEA:UniProtKB-UniRule.
DR   HAMAP; MF_00392; LpxB; 1.
DR   InterPro; IPR003835; Glyco_trans_19.
DR   PANTHER; PTHR30372; PTHR30372; 1.
DR   Pfam; PF02684; LpxB; 1.
DR   TIGRFAMs; TIGR00215; lpxB; 1.
PE   3: Inferred from homology;
KW   Glycosyltransferase; Lipid A biosynthesis; Lipid biosynthesis;
KW   Lipid metabolism; Reference proteome; Transferase.
FT   CHAIN           1..396
FT                   /note="Lipid-A-disaccharide synthase"
FT                   /id="PRO_0000255187"
SQ   SEQUENCE   396 AA;  44033 MW;  B231BF9EA1441D0F CRC64;
     MTPISERPIR IGIVAGEASG DLLGAGLMQE IKALYPQATF EGIGGERMLK EGFNTFFQME
     RLSIMGLVEV LGRLPELLAM RRRIVDHFTA TPPDLFLGID SPDFTIGIEL KLRQAGIKTA
     HYVSPSVWAW RQNRVFKIAK AVDLMLTLLP FEARFYREHN VPVKFVGHPL AEIIPLHPDK
     VAMRHELGID ASGEVIAVLP GSRGGEVSRL GPTFIETIAW LHQRRPDVRF VIPAANQARK
     TQIEQQLQSH GGRLPVTLID QHSRECMMAA DAILLASGTA TLEAMLVKRP MVVAYKLATL
     SYWIMRRLLK AKYISLPNLL ADKALVPELI QNDATPAKLG EALLKELNVE RRRSLEDEFE
     GLHKLIRQNA SVAAAQAVAE LIEKGRVATH DAREGH