摘要
Objective To investigate reciprocal regulation between Fur and two RyhB homologs in Yersinia pestis(Y.pestis),as well as the roles of RyhBs in biofilm formation.Methods Regulatory relationships were assessed by a combination of colony morphology assay,primer extension,electrophoretic mobility shift assay and DNase I footprinting.Results Fur bound to the promoter-proximal DNA regions of ryhB1 and ryhB2 to repress their transcription,while both RyhB1 and RyhB2 repressed the expression of Fur at the post-transcriptional level.In addition,both RyhB1 and RyhB2 positively regulated Y.pestis biofilm exopolysaccharide(EPS)production and the expression of hmsHFRS and hmsT.Conclusion Fur and the two RyhB homologs exert negative reciprocal regulation,and RyhB homologs have a positive regulatory effect on biofilm formation in Y.pestis.
基金
supported by the Basic Application Research Project of Science and Technology Department of Qinghai province[2020-ZJ-788]
the Key Laboratory of National Health Commission on Plague Control and Prevention[2019PT310004]
the Key Laboratory for Plague Prevention and Control of Qinghai Province[p2020-ZJ-Y23]
the Qinghai Province High-end Innovative Talents Thousand Talents Program(2019)。
