4ydz | pdb_00004ydz

Stress-induced protein 1 from Caenorhabditis elegans

spinqualitylabelsall models 4ydz, resolution 3.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4ydz is a 4 chain structure with sequence from Caenorhabditis elegans. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function SIP1_CAEEL Publication Abstract from PubMed Small heat shock proteins (sHsps) are ubiquitous molecular chaperones that prevent the aggregation of unfolding proteins during proteotoxic stress. In Caenorhabditis elegans, Sip1 is the only sHsp exclusively expressed in oocytes and embryos. Here, we demonstrate that Sip1 is essential for heat shock survival of reproducing adults and embryos. X-ray crystallography and electron microscopy revealed that Sip1 exists in a range of well-defined globular assemblies consisting of two half-spheres, each made of dimeric "spokes." Strikingly, the oligomeric distribution of Sip1 as well as its chaperone activity depend on pH, with a trend toward smaller species and higher activity at acidic conditions such as present in nematode eggs. The analysis of the interactome shows that Sip1 has a specific substrate spectrum including proteins that are essential for embryo development. The Chaperone Activity of the Developmental Small Heat Shock Protein Sip1 Is Regulated by pH-Dependent Conformational Changes.,Fleckenstein T, Kastenmuller A, Stein ML, Peters C, Daake M, Krause M, Weinfurtner D, Haslbeck M, Weinkauf S, Groll M, Buchner J Mol Cell. 2015 May 22. pii: S1097-2765(15)00301-9. doi:, 10.1016/j.molcel.2015.04.019. PMID:26009280 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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