Abstract

The study of proteins with the same architecture, but different sequence has proven to be a valuable tool in the protein folding field. As a prelude to studies on the folding mechanism of spectrin domains we present the kinetic characterisation of the wild-type forms of the 15th, 16th, and 17th domains of chicken brain alpha-spectrin (referred to as R15, R16 and R17, respectively). We show that the proteins all behave in a two-state manner, with different kinetic properties. The folding rate varies remarkably between different members, with a 5000-fold variation in folding rate and 3000-fold variation in unfolding rate seen for proteins differing only 1 kcal mol(-1) in stability. We show clear evidence for significant complexity in the energy landscape of R16, which shows a change in amplitude outside the stopped-flow timescale and curvature in the unfolding arm of the chevron plot. The accompanying paper describes the characterisation of the folding pathway of this domain. Study holds ProTherm entries: 18102, 18103, 18104, 18105, 18106 Extra Details: 15th domain protein folding; helix-bundle; spectrin; residual structure; homologue

Submission Details

ID: Xr4UWQE23

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:50 p.m.

Version: 1

Publication Details

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