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Default A Method for Systematic Assessment of Intrinsically Disordered Protein Regions by NMR.

A Method for Systematic Assessment of Intrinsically Disordered Protein Regions by NMR.

Related Articles A Method for Systematic Assessment of Intrinsically Disordered Protein Regions by NMR.

Int J Mol Sci. 2015;16(7):15743-15760

Authors: Goda N, Shimizu K, Kuwahara Y, Tenno T, Noguchi T, Ikegami T, Ota M, Hiroaki H

Abstract
Intrinsically disordered proteins (IDPs) that lack stable conformations and are highly flexible have attracted the attention of biologists. Therefore, the development of a systematic method to identify polypeptide regions that are unstructured in solution is important. We have designed an "indirect/reflected" detection system for evaluating the physicochemical properties of IDPs using nuclear magnetic resonance (NMR). This approach employs a "chimeric membrane protein"-based method using the thermostable membrane protein PH0471. This protein contains two domains, a transmembrane helical region and a C-terminal OB (oligonucleotide/oligosaccharide binding)-fold domain (named NfeDC domain), connected by a flexible linker. NMR signals of the OB-fold domain of detergent-solubilized PH0471 are observed because of the flexibility of the linker region. In this study, the linker region was substituted with target IDPs. Fifty-three candidates were selected using the prediction tool POODLE and 35 expression vectors were constructed. Subsequently, we obtained 15N-labeled chimeric PH0471 proteins with 25 IDPs as linkers. The NMR spectra allowed us to classify IDPs into three categories: flexible, moderately flexible, and inflexible. The inflexible IDPs contain membrane-associating or aggregation-prone sequences. This is the first attempt to use an indirect/reflected NMR method to evaluate IDPs and can verify the predictions derived from our computational tools.


PMID: 26184172 [PubMed - as supplied by publisher]



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