The role of the N-terminal amphipathic helix in bacterial YidC: Insights from functional studies, the crystal structure and molecular dynamics simulations

Nass, Karol J; Ilie, Ioana M; Saller, Manfred J; Driessen, Arnold J M; Caflisch, Amedeo; Kammerer, Richard A; Li, Xiaodan

doi:10.5167/uzh-213476

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Nass, K. J., Ilie, I. M., Saller, M. J., Driessen, A. J. M., Caflisch, A., Kammerer, R. A., & Li, X. (2022). The role of the N-terminal amphipathic helix in bacterial YidC: Insights from functional studies, the crystal structure and molecular dynamics simulations. Biochimica et Biophysica Acta. Biomembranes, 1864(3), 183825. https://doi.org/10.1016/j.bbamem.2021.183825

Abstract

The evolutionary conserved YidC is a unique dual-function membrane protein that adopts insertase and chaperone conformations. The N-terminal helix of Escherichia coli YidC functions as an uncleaved signal sequence and is important for membrane insertion and interaction with the Sec translocon. Here, we report the first crystal structure of Thermotoga maritima YidC (TmYidC) including the N-terminal amphipathic helix (N-AH) (PDB ID: 6Y86). Molecular dynamics simulations show that N-AH lies on the periplasmic side of the membrane bilayer