5jxt

Crystal structure of MtISWI bound with histone H4 tail

spinqualitylabelsall models 5jxt, resolution 3.01Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 5jxt is a 23 chain structure with sequence from Saitoella complicata NRRL Y-17804 and Thermothelomyces thermophilus ATCC 42464. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 3.009Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function G2QFM3_MYCTT Publication Abstract from PubMed ISWI is a member of the SWI2/SNF2 family of chromatin remodellers, which also includes Snf2, Chd1, and Ino80. ISWI is the catalytic subunit of several chromatin remodelling complexes, which mobilize nucleosomes along genomic DNA, promoting replication progression, transcription repression, heterochromatin formation, and many other nuclear processes. The ATPase motor of ISWI is an autonomous remodelling machine, whereas its carboxy (C)-terminal HAND-SAND-SLIDE (HSS) domain functions in binding extranucleosomal linker DNA. The activity of the catalytic core of ISWI is inhibited by the regulatory AutoN and NegC domains, which are in turn antagonized by the H4 tail and extranucleosomal DNA, respectively, to ensure the appropriate chromatin landscape in cells. How AutoN and NegC inhibit ISWI and regulate its nucleosome-centring activity remains elusive. Here we report the crystal structures of ISWI from the thermophilic yeast Myceliophthora thermophila and its complex with a histone H4 peptide. Our data show the amino (N)-terminal AutoN domain contains two inhibitory elements, which collectively bind the second RecA-like domain (core2), holding the enzyme in an inactive conformation. The H4 peptide binds to the core2 domain coincident with one of the AutoN-binding sites, explaining the ISWI activation by H4. The H4-binding surface is conserved in Snf2 and functions beyond AutoN regulation. The C-terminal NegC domain is involved in binding to the core2 domain and functions as an allosteric element for ISWI to respond to the extranucleosomal DNA length. Structure and regulation of the chromatin remodeller ISWI.,Yan L, Wang L, Tian Y, Xia X, Chen Z Nature. 2016 Dec 15;540(7633):466-469. doi: 10.1038/nature20590. Epub 2016 Dec 5. PMID:27919072 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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