Nadon Celine A, Bowen Barbara M, Wiedmann Martin, Boor Kathryn J
Department of Food Science, Cornell University, Ithaca, New York 14853, USA.
Infect Immun. 2002 Jul;70(7):3948-52. doi: 10.1128/IAI.70.7.3948-3952.2002.
Transcription of the Listeria monocytogenes positive regulatory factor A protein (PrfA) is initiated from either of two promoters immediately upstream of prfA (prfAp(1) and prfAp(2)) or from the upstream plcA promoter. We demonstrate that prfAp(2) is a functional sigma(B)-dependent promoter and that a sigB deletion mutation affects the virulence phenotype of L. monocytogenes. Thus, the alternative sigma factor sigma(B) contributes to virulence in L. monocytogenes.
单核细胞增生李斯特菌阳性调节因子A蛋白(PrfA)的转录起始于prfA上游紧邻的两个启动子之一(prfAp(1)和prfAp(2)),或者起始于上游的plcA启动子。我们证明prfAp(2)是一个功能性的依赖于σ(B)的启动子,并且σ(B)缺失突变会影响单核细胞增生李斯特菌的毒力表型。因此,替代的σ因子σ(B)有助于单核细胞增生李斯特菌的毒力。