Abstract
Abstract. Streptococcus agalactiae can cause variety of diseases of newborns and adults. For successful colonization of different human tissues and organs as well as for suppression of the host immune system S. agalactiae expresses numerous virulence factors. For coordinated expression of the virulence genes S. agalactiae employs regulatory molecules including regulatory proteins of two-component systems. Results of the present study demonstrated that in S. agalactiae strain A49V the natural mutation in the brgR gene encoding for BgrR regulatory protein, which is component of regulatory system BgrRS, resulted in the repression of Bac protein synthesis, a virulence factor of S. agalactiae. A single nucleotide deletion in the bgrR gene has caused a shift of the reading frame and the changes in the primary, secondary and tertiary structures of the BgrR protein. The loss of functional activity of BgrR protein in A49V strain and repression of Bac protein synthesis have increased virulence of the strain in experimental animal streptococcal infection.
Highlights
NATURAL MUTATION IN THE GENE OF RESPONSE REGULATOR BgrR RESULTING IN REPRESSION OF Bac PROTEIN SYNTHESIS, A PATHOGENICITY FACTOR OF STREPTOCOCCUS AGALACTIAE
Results of the present study demonstrated that in S. agalactiae strain A49V the natural mutation in the brgR gene encoding for BgrR regulatory protein, which is component of regulatory system BgrRS, resulted in the repression of Bac protein synthesis, a virulence factor of S. agalactiae
CsrRS regulates group B streptococcus virulence gene expression in response to environmental pH: a new perspective on vaccine development // J
Summary
ПРИРОДНАЯ МУТАЦИЯ В ГЕНЕ БЕЛКАРЕГУЛЯТОРА BgrR, ПРИВОДЯЩАЯ К НАРУШЕНИЮ СИНТЕЗА БЕЛКА Вас, ФАКТОРА ПАТОГЕННОСТИ STREPTOCOCCUS AGALACTIAE. Для успешной колонизации различных органов и тканей человека, а также для подавления его иммунной системы, S. agalactiae синтезирует большое количество факторов патогенности. Полученные в рамках настоящего исследования результаты показали, что в штамме S. agalactiae A49V природная мутация в гене белка-регулятора BgrR, входящего в состав двухкомпонентной системы BgrRS, привела к нарушению синтеза одного из факторов патогенности S. agalactiae — белка Вас. Потеря белком BgrR штамма A49V функциональной активности и нарушение синтеза белка Вас привели к увеличению вирулентности штамма при моделировании стрептококковой инфекции на лабораторных мышах. Ключевые слова: Streptococcus agalactiae, двухкомпонентная регуляторная система BgrRS, белок Bac, вирулентность. NATURAL MUTATION IN THE GENE OF RESPONSE REGULATOR BgrR RESULTING IN REPRESSION OF Bac PROTEIN SYNTHESIS, A PATHOGENICITY FACTOR OF STREPTOCOCCUS AGALACTIAE.
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