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|Title:||In vitro characterization and identification of potential substrates of a low molecular weight protein tyrosine phosphatase in Streptococcus pneumoniae|
|Citation:||Microbiology, 2018; 164(4):697-703|
|Zuleeza Ahmad, Renato Morona and Alistair J. Standish|
|Abstract:||Streptococcus pneumoniae is a major human pathogen responsible for significant mortality and morbidity worldwide. Within the annotated genome of the pneumococcus lies a previously uncharacterized protein tyrosine phosphatase which shows homology to low molecular weight protein tyrosine phosphatases (LMWPTPs). LMWPTPs modulate many processes critical for the pathogenicity of a number of bacteria including capsular polysaccharide biosynthesis, stress response and persistence in host macrophages. Here, we demonstrate that Spd1837 is indeed a LMWPTP, by purifying the protein, and characterizing its phosphatase activity. Spd1837 showed specific tyrosine phosphatase activity, and it did not form higher order oligomers in contrast to many other LMWPTPs. Substrate-trapping assays using the wild-type and the phosphatase-deficient Spd1837 identified potential substrates/interacting proteins including major metabolic enzymes such as ATP-dependent-6-phosphofructokinase and Hpr kinase/phosphorylase. Given the tight association between the bacterial basic physiology and virulence, this study hopes to prompt further investigation of how the pneumococcus controls its metabolic flux via the LMWPTP Spd1837.|
|Keywords:||Tyrosine phosphorylation; low molecular weight phosphatase; pneumococcus; Streptococcus pneumoniae; phosphatase substrates identification|
|Rights:||© 2018 The Authors|
|Appears in Collections:||Aurora harvest 8|
Molecular and Biomedical Science publications
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