HslVU is a two-component ATP-dependent protease, consisting of HslV peptidase and HslU ATPase. CodW and CodX, encoded by the cod operon in Bacillus subtilis, display 52% identity in their amino acid sequences to HslV and HslU in Escherichia coli, respectively. Here we show that CodW and CodX can function together as a new type of two-component ATP-dependent protease. Remarkably, CodW uses its N-terminal serine hydroxyl group as the catalytic nucleophile, unlike HslV and certain β-type subunits of the proteasomes, which have N-terminal threonine functioning as an active site residue. The ATP-dependent proteolytic activity of CodWX is strongly inhibited by serine protease inhibitors, unlike that of HslVU. Replacement of the N-terminal serine of CodW by alanine or even threonine completely abolishes the enzyme activity. These results indicate that CodWX in B.subtilis represents the first N-terminal serine protease among all known proteolytic enzymes.
CITATION STYLE
Kang, M. S., Lim, B. K., Seong, I. S., Seol, J. H., Tanahashi, N., Tanaka, K., & Chung, C. H. (2001). The ATP-dependent CodWX (HsIVU) protease in Bacillus subtilis is an N-terminal serine protease. EMBO Journal, 20(4), 734–742. https://doi.org/10.1093/emboj/20.4.734
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