Apr 24, 2020

Sequence-dependent correlated segments in the intrinsically disordered region of ChiZ

BioRxiv : the Preprint Server for Biology
A. HicksHuan-Xiang Zhou

Abstract

Intrinsically disordered proteins (IDPs) account for a significant fraction of any proteome and are central to numerous cellular functions. Yet how sequences of IDPs code for their conformational dynamics is poorly understood. Here we combined NMR spectroscopy, small-angle X-ray scattering (SAXS), and molecular dynamics (MD) simulations to characterize the conformations and dynamics of ChiZ1-64. This IDP is the N-terminal fragment (residues 1-64) of the transmembrane protein ChiZ, a component of the cell division machinery in Mycobacterium tuberculosis. Its N-half contains most of the prolines and all of the anionic residues while the C-half most of the glycines and cationic residues. MD simulations, first validated by SAXS and secondary chemical shift data, found scant a-helices or b-strands but considerable propensity for polyproline II (PPII) torsion angles. Importantly, several blocks of residues (e.g., 11-29) emerge as correlated segments, identified by frequent formation of PPII stretches, salt bridges, cation-p interactions, and sidechain-backbone hydrogen bonds. NMR relaxation experiments showed non-uniform transverse relaxation rates (R2s) and nuclear Overhauser enhancements (NOEs) along the sequence (e.g., high R2s an...Continue Reading

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