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Methyl 3‐Hydroxymyristate, a Diffusible Signal Mediating phc Quorum Sensing in Ralstonia solanacearum

2015; Wiley; Volume: 16; Issue: 16 Linguagem: Inglês

10.1002/cbic.201500456

1439-7633

Kenji Kai, Hideyuki Ohnishi, Mika Shimatani, Shiho Ishikawa, Yuka Mori, Akinori Kiba, Kouhei Ohnishi, Mitsuaki Tabuchi, Yasufumi Hikichi,

Infections and bacterial resistance

Abstract Ralstonia solanacearum , a plant pathogenic bacterium causing “bacterial wilt” on crops, uses a quorum sensing (QS) system consisting of phc regulatory elements to control its virulence. Methyl 3‐hydroxypalmitate (3‐OH PAME) was previously identified as the QS signal in strain AW1. However, 3‐OH PAME has not been reportedly detected from any other strains, and this suggests that they produce another unknown QS signal. Here we identify ( R )‐methyl 3‐hydroxymyristate [( R )‐3‐OH MAME] as a new QS signal that regulates the production of virulence factors and secondary metabolites. ( R )‐3‐OH MAME was synthesized by the methyltransferase PhcB and sensed by the histidine kinase PhcS. The phylogenetic trees of these proteins from R. solanacearum strains were divided into two groups, according to their QS signal types—( R )‐3‐OH MAME or ( R )‐3‐OH PAME. These results demonstrate that ( R )‐3‐OH MAME is another crucial QS signal and highlight the unique evolution of QS systems in R. solanacearum .