3q68
From Proteopedia
Structure of the Vps75-Rtt109 histone chaperone-lysine acetyltransferase complex (Full-length proteins in space group P212121)
Structural highlights
FunctionVPS75_YEAST Histone chaperone which acts as a cofactor stimulating the histone H3 'Lys-56' acetylation by RTT109. May be involved in vacuolar proteins sorting.[1] [2] Publication Abstract from PubMedThe histone chaperone Vps75 presents the remarkable property of stimulating the Rtt109-dependent acetylation of several histone H3 lysine residues within (H3-H4)2 tetramers. To investigate this activation mechanism, we determined X-ray structures of full-length Vps75 in complex with full-length Rtt109 in two crystal forms. Both structures show similar asymmetric assemblies of a Vps75 dimer bound to an Rtt109 monomer. In the Vps75-Rtt109 complexes, the catalytic site of Rtt109 is confined to an enclosed space that can accommodate the N-terminal tail of histone H3 in (H3-H4)2. Investigation of Vps75-Rtt109-(H3-H4)2 and Vps75-(H3-H4)2 complexes by NMR spectroscopy-probed hydrogen/deuterium exchange suggests that Vps75 guides histone H3 in the catalytic enclosure. These findings clarify the basis for the enhanced acetylation of histone H3 tail residues by Vps75-Rtt109. Structure and histone binding properties of the Vps75-Rtt109 chaperone-lysine acetyltransferase complex.,Su D, Hu Q, Zhou H, Thompson JR, Xu RM, Zhang Z, Mer G J Biol Chem. 2011 Mar 22. PMID:21454705[3] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also
References
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