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The Journal of Membrane Biology

, Volume 248, Issue 3, pp 371–381 | Cite as

Influence of Pathogenic Mutations on the Energetics of Translocon-Mediated Bilayer Integration of Transmembrane Helices

  • Jonathan P. Schlebach
  • Charles R. Sanders
Article

Abstract

Aberrant protein folding and assembly contribute to a number of diseases, and efforts to rationalize how pathogenic mutations cause this phenomenon represent an important imperative in biochemical research. However, for α-helical membrane proteins, this task is complicated by the fact that membrane proteins require intricate machinery to achieve structural and functional maturity under cellular conditions. In this work, we utilized the ΔG predictor algorithm (www.dgpred.cbr.su.se) to survey 470 known pathogenic mutations occurring in five misfolding-prone α-helical membrane proteins for their predicted effects on the translocon-mediated membrane integration of transmembrane helices, a critical step in biosynthesis and folding of nascent membrane proteins. The results suggest that about 10 % of these mutations are likely to have adverse effects on the topogenesis of nascent membrane proteins. These results suggest that the misfolding of a modest but nonetheless significant subset of pathogenic variants may begin at the translocon. Potential implications for therapeutic design and personalized medicine are discussed.

Keywords

Misfolding disease Rhodopsin Peripheral myelin protein 22 Cystic fibrosis transmembrane regulator Vasopressin V2 receptor KCNQ1 

Notes

Acknowledgments

This work was supported by US NIH Grants RO1 DC007416, RO1 HL122010, and U54 GM094608. JPS was supported by US NIH F32 GM110929.

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Copyright information

© Springer Science+Business Media New York 2014

Authors and Affiliations

  1. 1.Department of Biochemistry and Center for Structural BiologyVanderbilt University School of MedicineNashvilleUSA

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