title: Disruption of the polyhydroxyalkanoate synthase gene in Aeromonas hydrophila reduces its survival ability under stress conditions.
abstract: Aeromonas hydrophila 4AK4 produces PHBHHx copolyesters consisting of 3-hydroxybutyrate and 3-hydroxyhexanoate. In this paper, the physiological functions of PHBHHx on the bacterial survival ability were systematically studied using a PHBHHx synthase PhaC-disrupted mutant termed A. hydrophila CQ4 and its wild type A. hydrophila 4AK4. It was found that PHBHHx synthesis in A. hydrophila 4AK4 provided improved resistance against environmental stress factors including heat and cold treatments, hydrogen peroxide, UV irradiation, ethanol and high osmotic pressure compared with its PHBHHx synthase negative mutant A. hydrophila CQ4. The above resistant abilities were further confirmed by the different expression levels of sigma factor sigma(S) encoded by rpoS via real-time PCR study. The results suggested that rpoS played an important role in the enhanced resistance of host strain to stresses conferred by PHBHHx.
authors: Multidisciplinary Research Center, Shantou University, Shantou, China.
authors: Yan Hong
authors: YH
authors: Zhao
authors: Hong Ming
authors: HM
authors: Li
authors: Ling Fang
authors: LF
authors: Qin
authors: Hong Hui
authors: HH
authors: Wang
authors: Guo-Qiang
authors: GQ
authors: Chen
mesh_terms: D020155:3-Hydroxybutyric Acid / Q000378:metabolism; D000217:Acyltransferases / Q000235:genetics* / Q000502:physiology; D016980:Aeromonas hydrophila / Q000201:enzymology* / Q000235:genetics / Q000502:physiology*; D000900:Anti-Bacterial Agents / Q000494:pharmacology; D001426:Bacterial Proteins / Q000096:biosynthesis; D002208:Caproates / Q000378:metabolism; D003080:Cold Temperature; D015169:Colony Count, Microbial; D000431:Ethanol / Q000494:pharmacology; D017353:Gene Deletion; D015964:Gene Expression Regulation, Bacterial; D006358:Hot Temperature; D006861:Hydrogen Peroxide / Q000494:pharmacology; D050296:Microbial Viability / Q000235:genetics*; D016254:Mutagenesis, Insertional; D009997:Osmotic Pressure; D018384:Oxidative Stress; D012329:RNA, Bacterial / Q000096:biosynthesis; D012333:RNA, Messenger / Q000096:biosynthesis; D020133:Reverse Transcriptase Polymerase Chain Reaction; D012808:Sigma Factor / Q000096:biosynthesis; D014466:Ultraviolet Rays; D000094122:Polyhydroxybutyrates
chemical_list: D020155:3-Hydroxybutyric Acid; D000217:Acyltransferases; D000900:Anti-Bacterial Agents; D001426:Bacterial Proteins; D002208:Caproates; D000431:Ethanol; D006861:Hydrogen Peroxide; D012329:RNA, Bacterial; D012333:RNA, Messenger; D012808:Sigma Factor; C115940:poly(3-hydroxybutyrate-co-3-hydroxyhexanoate); D000094122:Polyhydroxybutyrates; C069567:sigma factor KatF protein, Bacteria; C077225:poly(3-hydroxyalkanoic acid) synthase