Heterologous complementation of the exopolysaccharide synthesis and carbon utilization phenotypes of Sinorhizobium meliloti Rm1021 polyhydroxyalkanoate synthesis mutants.
A reduced exopolysaccharide phenotype is associated with inability to synthesize polyhydroxyalkanaote (PHA) stores in Sinorhizobium meliloti strain Rm1021. Loss of function mutations in phbB and phbC result in non-mucoid colony morphology on Yeast Mannitol Agar, compared to the mucoid phenotype exhibited by the parental strain. This phenotype is attributed to reduction in succinoglycan synthesis. We have used complementation of this phenotype and the previously described D-3-hydroxybutyrate/acetoacetate utilization phenotype to isolate a heterologous clone containing a Bradyrhizobium japonicum phbC gene. Sequence analysis confirmed that this clone contains one of the five predicted phbC genes in the B. japonicum genome. The described phenotypic complementation strategy should be useful for isolation of novel PHA synthesis genes of diverse origin.
Department of Biology, University of Waterloo, 200 University Avenue West, Waterloo, ON, Canada N2L 3G1.
Punita
P
Aneja
Meixue
M
Dai
Delphine A
DA
Lacorre
Brent
B
Pillon
Trevor C
TC
Charles
D000217:Acyltransferases / Q000235:genetics / Q000378:metabolism*; D020369:Bradyrhizobium / Q000235:genetics / Q000378:metabolism; D002244:Carbon / Q000378:metabolism*; D005816:Genetic Complementation Test; D009154:Mutation; D010641:Phenotype; D011091:Polyesters / Q000378:metabolism; D011135:Polysaccharides, Bacterial / Q000096:biosynthesis* / Q000378:metabolism; D016962:Sinorhizobium meliloti / Q000201:enzymology / Q000235:genetics / Q000378:metabolism*
D011091:Polyesters; D011135:Polysaccharides, Bacterial; C056779:succinoglycan; D002244:Carbon; D000217:Acyltransferases; C077225:poly(3-hydroxyalkanoic acid) synthase