| Structural highlights
Function
[NAA60_HUMAN] Histone acetyltransferase localized in the Golgi apparatus that mediates acetylation of free histone H4, thereby facilitating nucleosome assembly. Has a preference for free histone H4 'Lys-20'(H4K20ac), 'Lys-79'(H4K79ac) and 'Lys-91' (H4K91ac). Also displays alpha (N-terminal) acetyltransferase activity towards a range of N-terminal sequences including those starting with Met-Lys, Met-Val, Met-Ala and Met-Met. Required for normal chromosomal segregation during anaphase.[1] [2]
Publication Abstract from PubMed
N-terminal acetylation (Nt-acetylation), carried out by N-terminal acetyltransferases (NATs), is a conserved and primary modification of nascent peptide chains. Naa60 (also named NatF) is a recently identified NAT found only in multicellular eukaryotes. This protein was shown to locate on the Golgi apparatus and mainly catalyze the Nt-acetylation of transmembrane proteins, and it also harbors lysine N(epsilon)-acetyltransferase (KAT) activity to catalyze the acetylation of lysine epsilon-amine. Here, we report the crystal structures of human Naa60 (hNaa60) in complex with Acetyl-Coenzyme A (Ac-CoA) or Coenzyme A (CoA). The hNaa60 protein contains an amphipathic helix following its GNAT domain that may contribute to Golgi localization of hNaa60, and the beta7-beta8 hairpin adopted different conformations in the hNaa60(1-242) and hNaa60(1-199) crystal structures. Remarkably, we found that the side-chain of Phe 34 can influence the position of the coenzyme, indicating a new regulatory mechanism involving enzyme, co-factor and substrates interactions. Moreover, structural comparison and biochemical studies indicated that Tyr 97 and His 138 are key residues for catalytic reaction and that a non-conserved beta3-beta4 long loop participates in the regulation of hNaa60 activity.
Structure and function of human Naa60 (NatF), a Golgi-localized bi-functional acetyltransferase.,Chen JY, Liu L, Cao CL, Li MJ, Tan K, Yang X, Yun CH Sci Rep. 2016 Aug 23;6:31425. doi: 10.1038/srep31425. PMID:27550639[3]
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.
References
- ↑ Van Damme P, Hole K, Pimenta-Marques A, Helsens K, Vandekerckhove J, Martinho RG, Gevaert K, Arnesen T. NatF contributes to an evolutionary shift in protein N-terminal acetylation and is important for normal chromosome segregation. PLoS Genet. 2011 Jul;7(7):e1002169. doi: 10.1371/journal.pgen.1002169. Epub 2011 , Jul 7. PMID:21750686 doi:http://dx.doi.org/10.1371/journal.pgen.1002169
- ↑ Yang X, Yu W, Shi L, Sun L, Liang J, Yi X, Li Q, Zhang Y, Yang F, Han X, Zhang D, Yang J, Yao Z, Shang Y. HAT4, a Golgi apparatus-anchored B-type histone acetyltransferase, acetylates free histone H4 and facilitates chromatin assembly. Mol Cell. 2011 Oct 7;44(1):39-50. doi: 10.1016/j.molcel.2011.07.032. PMID:21981917 doi:http://dx.doi.org/10.1016/j.molcel.2011.07.032
- ↑ Chen JY, Liu L, Cao CL, Li MJ, Tan K, Yang X, Yun CH. Structure and function of human Naa60 (NatF), a Golgi-localized bi-functional acetyltransferase. Sci Rep. 2016 Aug 23;6:31425. doi: 10.1038/srep31425. PMID:27550639 doi:http://dx.doi.org/10.1038/srep31425
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