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  • Nat Commun. 2014-03; 5:3394
  • Tousled-like kinases phosphorylate Asf1 to promote histone supply during DNA replication.

  • Klimovskaia IM, Young C, Strømme CB, Menard P, Jasencakova Z, Mejlvang J, Ask K, Ploug M, Nielsen ML, Jensen ON, Groth A.
  • Biotech Research and Innovation Centre (BRIC) and Centre for Epigenetics, University of Copenhagen, Ole Maaløes Vej 5, Copenhagen DK-2200, Denmark.

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...Asf1a pS166 rabbit polyclonal antibodies were generated against Asf1a phospho-peptide (CTEKLEDAESpSNPNL) and double affinity purified (GenScript)...


Nat Commun.

Abstract

During DNA replication, nucleosomes are rapidly assembled on newly synthesized DNA to restore chromatin organization. Asf1, a key histone H3-H4 chaperone required for this process, is phosphorylated by Tousled-like kinases (TLKs). Here, we identify TLK phosphorylation sites by mass spectrometry and dissect how phosphorylation has an impact on human Asf1 function. The divergent C-terminal tail of Asf1a is phosphorylated at several sites, and this is required for timely progression through S phase. Consistent with this, biochemical analysis of wild-type and phospho-mimetic Asf1a shows that phosphorylation enhances binding to histones and the downstream chaperones CAF-1 and HIRA. Moreover, we find that TLK phosphorylation of Asf1a is induced in cells experiencing deficiency of new histones and that TLK interaction with Asf1a involves its histone-binding pocket. We thus propose that TLK signalling promotes histone supply in S phase by targeting histone-free Asf1 and stimulating its ability to shuttle histones to sites of chromatin assembly.

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...Asf1a pS166 rabbit polyclonal antibodies were generated against Asf1a phospho-peptide (CTEKLEDAESpSNPNL) and double affinity purified (GenScript)...

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