Publikationsdatenbank

Streptococcus suis TrpX is part of a tryptophan uptake system, and its expression is regulated by a T-box regulatory element (2022)

Art

Zeitschriftenartikel / wissenschaftlicher Beitrag

Autoren

Dresen, Muriel

Schaaf, Desirée

Arenas, Jesús

de Greeff, Astrid

Valentin-Weigand, Peter

Nerlich, Andreas (Tiermedizinisches Zentrum für Resistenzforschung)

Quelle

Scientific reports

Bandzählung: 12

Heftzählung: 1

Seiten: 13920

ISSN: 2045-2322

Sprache

Englisch

Verweise

URL (Volltext): https://www.nature.com/articles/s41598-022-18227-3

DOI: 10.1038/s41598-022-18227-3

Pubmed: 35978073

Kontakt

Tiermedizinisches Zentrum für Resistenzforschung

Robert-von-Ostertag-Str. 8
14163 Berlin

Abstract / Zusammenfassung

Streptococcus suis, a common member of the porcine respiratory microbiota, can cause life-threatening diseases in pigs as well as humans. A previous study identified the gene trpX as conditionally essential for in vivo survival by intrathecal infection of pigs with a transposon library of S. suis strain 10. Here, we characterized trpX, encoding a putative tryptophan/tyrosine transport system substrate-binding protein, in more detail. We compared growth capacities of the isogenic trpX-deficient mutant derivative strain 10∆trpX with its parent. Growth experiments in chemically defined media (CDM) revealed that growth of 10∆trpX depended on tryptophan concentration, suggesting TrpX involvement in tryptophan uptake. We demonstrated that trpX is part of an operon structure and co-transcribed with two additional genes encoding a putative permease and ATPase, respectively. Bioinformatics analysis identified a putative tryptophan T-box riboswitch in the 5' untranslated region of this operon. Finally, qRT-PCR and a reporter activation assay revealed trpX mRNA induction under tryptophan-limited conditions. In conclusion, our study showed that TrpX is part of a putative tryptophan ABC transporter system regulated by a T-box riboswitch probably functioning as a substrate-binding protein. Due to the tryptophan auxotrophy of S. suis, TrpX plays a crucial role for metabolic adaptation and growth during infection.