Journal
MOLECULAR CELL
Volume 58, Issue 1, Pages 71-82Publisher
CELL PRESS
DOI: 10.1016/j.molcel.2015.02.010
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Funding
- Medical Research Council (MRC) [MC_UU_1201814]
- Medical Research Council [1068476, MC_U122680443, MC_UU_12018/4] Funding Source: researchfish
- MRC [MC_U122680443, MC_UU_12018/4] Funding Source: UKRI
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The complexity of higher organisms is not simply a reflection of the number of genes. A network of additional regulatory features, including protein post-translational modifications (PTMs), provides functional complexity otherwise inaccessible to a single gene product. Virtually all proteins are targets of PTMs. Here we characterize polyphosphorylation'' as the covalent attachment of inorganic polyphosphate (polyP) to target proteins. We found that nuclear signal recognition 1 (Nsr1) and its interacting partner, topoisomerase 1 (Top1), are polyphosphorylated. This modification occurs on lysine (K) residues within a conserved N-terminal polyacidic serine (S) and K-rich (PASK) cluster. We show that polyphos-phorylation negatively regulates Nsr1/Top1 interaction and impairs Top1 enzymatic activity. Physiological modulation of cellular levels of polyP regulates Top1 activity by modifying its polyphosphorylation status. We propose that polyphosphorylation adds an additional layer of regulation to nuclear signaling, where many PASK-containing proteins are known to play important roles.
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