1887

Abstract

The 241 aa human respiratory synctyial virus (HRSV) Long strain P protein is phosphorylated at serines 116, 117 and/or 119, and 232. Phosphates added to these residues have slow turnover and can be detected in the absence of protein phosphatase inhibition. Inhibition of phosphatases PP1 and PP2A increases the level of phosphorylation at serines 116, 117 and/or 119, suggesting a more rapid turnover for phosphates added to these residues compared to that of S232. High-turnover phosphorylation is detected in the P-protein NH-terminal region, mainly at S54 and, to a lesser extent, at S39, in the Long strain. When the P protein bears the T46I substitution (in the remaining HRSV strains), phosphates are added to S30, S39, S45 and S54. Phosphatase PP1 removes phosphate at residues in the central part of the P-protein molecule, whereas those in the NH-terminal region are removed by phosphatase PP2A. The significance of the phosphorylation of the NH-terminal region residues for some P-protein functions was studied. The results indicated that this modification is not essential for P-protein oligomerization or for its role in viral RNA synthesis. Nonetheless, dephosphorylation at S54 could facilitate P–M protein interactions that probably occur during the egress of viral particles.

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2005-04-01
2019-11-14
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