ID   LPXB_HAEIE              Reviewed;         390 AA.
AC   A5UD44;
DT   15-JAN-2008, integrated into UniProtKB/Swiss-Prot.
DT   10-JUL-2007, sequence version 1.
DT   25-MAY-2022, entry version 73.
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};
GN   OrderedLocusNames=CGSHiEE_06780;
OS   Haemophilus influenzae (strain PittEE).
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Pasteurellales;
OC   Pasteurellaceae; Haemophilus.
OX   NCBI_TaxID=374930;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=PittEE;
RX   PubMed=17550610; DOI=10.1186/gb-2007-8-6-r103;
RA   Hogg J.S., Hu F.Z., Janto B., Boissy R., Hayes J., Keefe R., Post J.C.,
RA   Ehrlich G.D.;
RT   "Characterization and modeling of the Haemophilus influenzae core and
RT   supragenomes based on the complete genomic sequences of Rd and 12 clinical
RT   nontypeable strains.";
RL   Genome Biol. 8:R103.1-R103.18(2007).
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; CP000671; ABQ98695.1; -; Genomic_DNA.
DR   RefSeq; WP_012054516.1; NC_009566.1.
DR   AlphaFoldDB; A5UD44; -.
DR   SMR; A5UD44; -.
DR   CAZy; GT19; Glycosyltransferase Family 19.
DR   KEGG; hip:CGSHiEE_06780; -.
DR   HOGENOM; CLU_036577_3_0_6; -.
DR   OMA; PTVWAWR; -.
DR   UniPathway; UPA00973; -.
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; Transferase.
FT   CHAIN           1..390
FT                   /note="Lipid-A-disaccharide synthase"
FT                   /id="PRO_1000049400"
SQ   SEQUENCE   390 AA;  43594 MW;  6BA2C64B3B361B31 CRC64;
     MNKTNPTIAL VAGEVSGDIL GAGLIRQLKA HYPNARFIGI AGPRMLAEGC ETLVDMEELS
     VMGLAEILKH LPRLLKIRKN IIQTMLQEKP DVYIGIDAPD FNLDVELKLK ANGIKTIHYV
     SPSVWAWRQN RIHKIAKATH QVLAFLPFEK AFYDKFNVPC RFIGHTMADA IPLKPNRAEA
     CQTLQIDPAQ RYLAILVGSR GSEVEFLAEP FLKTALLLKE QFPDLQFLVP LVNEKRRIQF
     EAIKAKITPN LDLHLIDGNA RQAMIAADAT LLASGTAALE AMLCKSPMVV GYRMKPLTYF
     LAKRLVKTDY ISLPNLLANE MLVPEMIQEE CTPELLAEKL SVYLSDDESA VKNRHVLIQH
     FTDLHQKIQC NADKQAAQAV IDLLEGTENV