期刊
FEBS LETTERS
卷 582, 期 9, 页码 1386-1390出版社
WILEY
DOI: 10.1016/j.febslet.2008.03.023
关键词
antibiotic resistance; bacterial protein synthesis; elongation factor; ribosomal protection proteins; tetracycline
Ribosomal protection proteins (RPPs) confer bacterial resistance to tetracycline by releasing this antibiotic from ribosomes stalled in protein synthesis. RPPs share structural similarity to elongation factor G (EF-G), which promotes ribosomal translocation during normal protein synthesis. We constructed and functionally characterized chimeric proteins of Campylobacter jejuni Tet(O), the best characterized RPP, and Escherichia coli EF-G. A distinctly conserved loop sequence at the tip of domain 4 is required for both factor- specific functions. Domains 3 - 5: (i) are necessary, but not sufficient, for functional specificity; and (ii) modulate GTP hydrolysis by EF-G, while minimally affecting Tet(O), under substrate turnover conditions. (C) 2008 Federation of European Biochemical Societies. Published by Elsevier B. V. All rights reserved.
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