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We experimentally identified the activities of six predicted heptosyltransferases in  Actinobacillus pleuropneumoniae  genome serotype 5b strain L20 and serotype 3 strain JL03. The initial identification was based on a bioinformatic analysis of the amino acid similarity between these putative heptosyltrasferases with others of known function from enteric bacteria and  Aeromonas . The putative functions of all the  Actinobacillus pleuropneumoniae  heptosyltrasferases were determined by using surrogate LPS acceptor molecules from well-defined  A. hydrophyla  AH-3 and  A. salmonicida  A450 mutants. Our results show that heptosyltransferases APL_0981 and APJL_1001 are responsible for the transfer of the terminal outer core D- glycero -D- manno -heptose (D,D-Hep) residue although they are not currently included in the CAZY glycosyltransferase 9 family. The WahF heptosyltransferase group signature sequence [S(T/S)(GA)XXH] differs from the heptosyltransferases consensus signature sequence [D(TS)(GA)XXH], because of the substitution of D 261  for S 261 , being unique.

plos one

Experimental Identification of Actinobacillus pleuropneumoniae Strains L20 and JL03 Heptosyltransferases, Evidence for a New Heptosyltransferase Signature Sequence