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Published on: December 20, 2014
The Functional Role of S280 within the ZYG-1 Phosphorylation Cluster During Centrosome Assembly in C. elegans Embryos
Amber Christian1, Sariah Richardson1, Layanne Obeid1
1Biological Sciences, Oakland University, Rochester, MI, US.
Abstract:
Proper centrosome duplication requires precise regulation of ZYG-1 . CK2-mediated phosphorylation of ZYG-1 contributes to this process by controlling ZYG-1 stability and centrosome number. Previous work identified a cluster of serine residues in ZYG-1 that collectively modulate ZYG-1 activity, but the contribution of individual sites remains unclear, except for S279. Here, we examine the role of S280 using CRISPR/Cas9-generated phospho-deficient mutations in the zyg-1 ( it25 ) background. While S279A strongly rescues the zyg-1 phenotype, S280A alone shows no effect. However, combining S280A with S279A diminishes the rescue effect of S279A. These results suggest that S279 and S280 function cooperatively within a regulatory module, with S279 acting as an inhibitory site and S280 supporting optimal ZYG-1 activity.
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