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J Biol Chem, Vol. 273, Issue 31, 19847-19852, July 31, 1998

Ribosomal Protein L27 Participates in both 50 S Subunit Assembly and the Peptidyl Transferase Reaction

Iwona K. Wower, Jacek Wower, and Robert A. Zimmermann

From the Department of Biochemistry and Molecular Biology, University of Massachusetts, Amherst, Massachusetts 01003-4505

Protein L27 has been implicated as a constituent of the peptidyl transferase center of the Escherichia coli 50 S ribosomal subunit by a variety of experimental observations. To define better the functional role of this protein, we constructed a strain in which the rpmA gene, which encodes L27, was replaced by a kanamycin resistance marker. The deletion mutant grows five to six times slower than the wild-type parent and is both cold- and temperature-sensitive. This phenotype is reversed when L27 is expressed from a plasmid-borne copy of the rpmA gene. Analysis of ribosomes from the L27-lacking strain revealed deficiencies in both the assembly and activity of the 50 S ribosomal subunits. Although functional 50 S subunits are formed in the mutant, an assembly "bottleneck" was evidenced by the accumulation of a prominent 40 S precursor to the 50 S subunit which was deficient in proteins L16, L20, and L21, as well as L27. In addition, the peptidyl transferase activity of 70 S ribosomes containing mutant 50 S subunits was determined to be three to four times lower than for wild-type ribosomes. Ribosomes lacking L27 were found to be impaired in the enzymatic binding of Phe-tRNAPhe to the A site, although the interaction of N-acetyl-Phe-tRNAPhe with the P site was largely unperturbed. We therefore infer that L27 contributes to peptide bond formation by facilitating the proper placement of the acceptor end of the A-site tRNA at the peptidyl transferase center.

Copyright © 1998 by The American Society for Biochemistry and Molecular Biology, Inc.
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