Bacillus anthracis SlaQ promotes S-layer protein assembly

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Abstract

Bacillus anthracis vegetative forms assemble an S-layer comprised of two S-layer proteins, Sap and EA1. A hallmark of S-layer proteins are their C-terminal crystallization domains, which assemble into a crystalline lattice once these polypeptides are deposited on the bacterial surface via association between their N-terminal S-layer homology domains and the secondary cell wall polysaccharide. Here we show that slaQ, encoding a small cytoplasmic protein conserved among pathogenic bacilli elaborating S-layers, is required for the efficient secretion and assembly of Sap and EA1. S-layer protein precursors cosediment with SlaQ, and SlaQ appears to facilitate Sap assembly. Purified SlaQ polymerizes and when mixed with purified Sap promotes the in vitro formation of tubular S-layer structures. A model is discussed whereby SlaQ, in conjunction with S-layer secretion factors SecA2 and SlaP, promotes localized secretion and S-layer assembly in B. anthracis.

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Nguyen-Mau, S. M., Oh, S. Y., Schneewind, D. I., Missiakas, D., & Schneewind, O. (2015). Bacillus anthracis SlaQ promotes S-layer protein assembly. Journal of Bacteriology, 197(19), 3216–3227. https://doi.org/10.1128/JB.00492-15

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