ID   LPXB_PROMI              Reviewed;         141 AA.
AC   P72216;
DT   01-NOV-1997, integrated into UniProtKB/Swiss-Prot.
DT   01-FEB-1997, sequence version 1.
DT   25-MAY-2022, entry version 57.
DE   RecName: Full=Lipid-A-disaccharide synthase;
DE            EC=2.4.1.182;
DE   Flags: Fragment;
GN   Name=lpxB;
OS   Proteus mirabilis.
OC   Bacteria; Proteobacteria; Gammaproteobacteria; Enterobacterales;
OC   Morganellaceae; Proteus.
OX   NCBI_TaxID=584;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC   STRAIN=PR 990;
RA   Servos S., Khan S.A., Papakonstantinopoulou A., Dougan G., Maskell D.;
RL   Submitted (NOV-1996) to the EMBL/GenBank/DDBJ databases.
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. {ECO:0000250}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=2-N,3-O-bis[(3R)-3-hydroxytetradecanoyl]-alpha-D-glucosaminyl
CC         1-phosphate + UDP-2-N,3-O-bis[(3R)-3-hydroxytetradecanoyl]-alpha-D-
CC         glucosamine = H(+) + lipid A disaccharide (E. coli) + UDP;
CC         Xref=Rhea:RHEA:22668, ChEBI:CHEBI:15378, ChEBI:CHEBI:57957,
CC         ChEBI:CHEBI:58223, ChEBI:CHEBI:58466, ChEBI:CHEBI:78847;
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;
CC   -!- PATHWAY: Glycolipid biosynthesis; lipid IV(A) biosynthesis; lipid IV(A)
CC       from (3R)-3-hydroxytetradecanoyl-[acyl-carrier-protein] and UDP-N-
CC       acetyl-alpha-D-glucosamine: step 5/6.
CC   -!- SIMILARITY: Belongs to the LpxB family. {ECO:0000305}.
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DR   EMBL; Y09263; CAA70457.1; -; Genomic_DNA.
DR   AlphaFoldDB; P72216; -.
DR   SMR; P72216; -.
DR   STRING; 584.AOUC001_03425; -.
DR   CAZy; GT19; Glycosyltransferase Family 19.
DR   UniPathway; UPA00359; UER00481.
DR   GO; GO:0008915; F:lipid-A-disaccharide synthase activity; IEA:UniProtKB-EC.
DR   GO; GO:0009245; P:lipid A biosynthetic process; IEA:UniProtKB-KW.
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..>141
FT                   /note="Lipid-A-disaccharide synthase"
FT                   /id="PRO_0000190175"
FT   NON_TER         141
SQ   SEQUENCE   141 AA;  15814 MW;  551D19F25600561E CRC64;
     MTLSGQSSIK QRPLVIGLVA GETSGDILGA GLIRALKQMH PNIRFVGVAG PLMQAEGCEA
     WYEMEELAVM GIVEVLERLP RLLKIRKDLT QRFTQLKPDV FVGIDAPDFN ITLEGRLKQK
     GLKTIHYVSP SVWAWRQKRV F