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Conformational Studies Suggest That the Double Stranded β Helix Scaffold Provides an Optimal Balance Between Protein Stability and Function

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Proteins with the double stranded beta-helix (DSBH, also known as cupin) fold perform a diverse range of functions. In this study, Bacillus subtilis quercetinase was used as a model system to understand the conformational determinants of functional diversity within the cupin fold. Controlled proteolysis experiments revealed that this enzyme is active, thermo-stable and maintains its quaternary arrangement even after substantial (ca 33 %) cleavage of the protein. The results presented in this manuscript thus show that the DSBH scaffold offers a novel balance between protein stability and function by locating the active site and substrate recognition features in the most stable region of the protein.

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Keywords: Conformational stability; Cupin; Double stranded beta helix; Fragment complementation; Oligomerization; Quercetinase

Document Type: Research Article

Publication date: March 1, 2008

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  • Protein & Peptide Letters publishes short papers in all important aspects of protein and peptide research, including structural studies, recombinant expression, function, synthesis, enzymology, immunology, molecular modeling, drug design etc. Manuscripts must have a significant element of novelty, timeliness and urgency that merit rapid publication. Reports of crystallisation, and preliminary structure determinations of biologically important proteins are acceptable. Purely theoretical papers are also acceptable provided they provide new insight into the principles of protein/peptide structure and function.
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