Abstract

A surface turn position in a four-helix bundle protein, Rop, was selected to investigate the role of turns in protein structure and stability. Although all twenty amino acids can be substituted at this position to generate a correctly folded protein, they produce an unusually large range of thermodynamic stabilities. Moreover, the majority of substitutions give rise to proteins with enhanced thermal stability compared to that of the wild type. By introducing the same twenty mutations at this position, but in a simplified context, we were able to deconvolute intrinsic preferences from local environmental effects. The intrinsic preferences can be explained on the basis of preferred backbone dihedral angles, but local environmental context can significantly modify these effects. Study holds ProTherm entries: 216, 217, 218, 219, 220, 221, 222, 223, 224, 225, 226, 227, 228, 229, 230, 231, 232, 233, 234, 235, 13252, 13253, 13254, 13255, 13256, 13257, 13258, 13259, 13260, 13261, 13262, 13263, 13264, 13265, 13266, 13267, 13268, 13269, 13270 Extra Details: ddG were determined at 69 degrees C (wild type Tm) protein stability; four-helix bundle; Rop; turns;,protein structure; thermodynamic; environmental effects

Submission Details

ID: Mz3eojSu

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:14 p.m.

Version: 1

Publication Details

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