Tourigny DS, Fernández IS, Kelley AC, Vakiti RR, Chattopadhyay AK, Dorich S, Hanessian S, Ramakrishnan V. Crystal structure of a bioactive pactamycin analog bound to the 30S ribosomal subunit.
J Mol Biol 2013;
425:3907-10. [PMID:
23702293 PMCID:
PMC3794158 DOI:
10.1016/j.jmb.2013.05.004]
[Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2013] [Revised: 05/13/2013] [Accepted: 05/14/2013] [Indexed: 11/03/2022]
Abstract
Biosynthetically and chemically derived analogs of the antibiotic pactamycin and de-6-methylsalicylyl (MSA)-pactamycin have attracted recent interest as potential antiprotozoal and antitumor drugs. Here, we report a 3.1-Å crystal structure of de-6-MSA-pactamycin bound to its target site on the Thermus thermophilus 30S ribosomal subunit. Although de-6-MSA-pactamycin lacks the MSA moiety, it shares the same binding site as pactamycin and induces a displacement of nucleic acid template bound at the E-site of the 30S. The structure highlights unique interactions between this pactamycin analog and the ribosome, which paves the way for therapeutic development of related compounds.
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