2kq3

Solution structure of SNase140

spinqualitylabelsall models 2kq3 Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 2kq3 is a 1 chain structure with sequence from Staphylococcus aureus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance. Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function A5A523_STAAU Evolutionary Conservation Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMed The role of the C-terminal loop L137-S141 in the folding and folding stability of staphylococcal nuclease (SNase) was investigated by deletion mutation. The C-terminal truncated SNase fragments, SNase137, SNase139, SNase140, and SNase141 containing residues 1-137, 1-139, 1-140, and 1-141, respectively, were adopted in this study. Folding states of these four SNase fragments were analyzed by circular dichroism and fluorescence measurements. The solution structure of SNase140 was determined and compared to those of SNase141 and native SNase using the heteronuclear NMR method. The results showed that folding of the four SNase fragments is correlated with the folding of helix alpha3. With the chain length extending from L137 and I139 to S141, folding of the fragments progressively approached to the tertiary folding of native SNase, and the folding stability was enhanced. These observations revealed that the C-terminal loop L137-S141 has profound effect not only on the folding of helix alpha3 but also on the stabilizing folding of both the alpha- and beta-subdomains of SNase. Analysis indicates that stabilizing folding of the SNase and SNase fragments depends to a large extent on the hydrophobic packing interactions in both the C-terminal local structural region surrounding W140 including the loop L137-S141 and the N-terminal local structural region of the "beta-barrel" hydrophobic core. Importance of the C-terminal loop L137-S141 for the folding and folding stability of staphylococcal nuclease.,Wang M, Feng Y, Yao H, Wang J Biochemistry. 2010 May 25;49(20):4318-26. PMID:20415411 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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