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Lipopolysaccharide phosphorylating enzymes encoded in the genomes of Gram‐negative bacteria are related to the eukaryotic protein kinases
Author(s) -
Krupa A.,
Srinivasan N.
Publication year - 2002
Publication title -
protein science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.353
H-Index - 175
eISSN - 1469-896X
pISSN - 0961-8368
DOI - 10.1110/ps.3560102
Subject(s) - phosphorylation , kinase , enzyme , bacteria , biology , protein phosphorylation , biochemistry , microbiology and biotechnology , chemistry , protein kinase a , computational biology , genetics
By means of profile‐matching procedures, conservation of functionally important residues, and fold‐recognition techniques, we show that two distinct families of lipopolysaccharide kinases encoded in the genomes of Gram‐negative bacteria are related to each other and to two distinct classes of proteins, namely eukaryotic protein kinases and right open reading frame (RIO1). Members of one of the lipopolysaccharide kinase families are identified only in pathogenic bacteria. Phosphorylation by these enzymes is relevant in the construction of outer membrane, immune response, and pathogenic virulence. The class of proteins called RIO1, also related to eukaryotic protein kinases and previously known to occur only in archaea and eukaryotes, are now identified in eubacteria as well. It has been suggested here that RIO1 proteins are intermediately related to lipopolysaccharide kinases and eukaryotic protein kinases implying an evolutionary relationship between the three classes of proteins.