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Hypothetical protein Spr1962 as a new substrate of the signalling pathway of the Ser/Thr protein kinase StkP and phosphatase PhpP.
Mašková, Kateřina ; Ulrych, Aleš (advisor) ; Fišer, Radovan (referee)
Hypothetical protein Spr1962 as a new substrate of the signalling pathway of the Ser/Thr protein kinase StkP and phosphatase PhpP The extracellular human pathogen Streptococcus pneumoniae encodes in its genome only a eukaryotic-type serine/threonine protein kinase (StkP) and the corresponding PP2C phosphatase (PhpP) in its genome. This makes it a unique model organism for the studying of signaling pathways in bacteria. To date, several substrates of this signaling protein have been identified and characterized, including DivIVA, KhpB, FtsA, FtsZ, MacP, GlmM, GpsB, ComE and others. These proteins are involved in various cellular processes, including cell division and peptidoglycan biosynthesis. In a global phosphoproteome study based on the LC- MS approach, one of the potential new substrates was the hypothetical protein Spr1962, whose phosphorylation was detected only in the hyperphosphorylated strain with deleted PhpP phosphatase. The aim of this work was to characterize this new substrate Spr1962 and to clarify its possible function. Based on the significant structural similarity to Spr1962 the FloT flotillin protein of Bacillus subtilis, it was suggested that it might be a protein with an analogous function in pneumococci. Deletion of this gene in different genetic backrounds was found to cause an...
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