PMID:10937997

Citation	Muth, GW, Ortoleva-Donnelly, L and Strobel, SA (2000) A single adenosine with a neutral pKa in the ribosomal peptidyl transferase center. Science 289:947-50
Abstract	Biochemical and crystallographic evidence suggests that 23S ribosomal RNA (rRNA) is the catalyst of peptide bond formation. To explore the mechanism of this reaction, we screened for nucleotides in Escherichia coli 23S rRNA that may have a perturbed pKa (where Ka is the acid constant) based on the pH dependence of dimethylsulfate modification. A single universally conserved A (number 2451) within the central loop of domain V has a near neutral pKa of 7.6 +/- 0.2, which is about the same as that reported for the peptidyl transferase reaction. In vivo mutational analysis of this nucleotide indicates that it has an essential role in ribosomal function. These results are consistent with a mechanism wherein the nucleotide base of A2451 serves as a general acid base during peptide bond formation.
Links	PubMed
Keywords	Adenosine/chemistry; Adenosine/metabolism; Binding Sites; Catalysis; Dimethyl Sulfoxide; Escherichia coli; Hydrogen Bonding; Methylation; Mutation; Peptide Biosynthesis; Peptidyl Transferases/chemistry; Peptidyl Transferases/metabolism; Protons; RNA, Bacterial/chemistry; RNA, Bacterial/genetics; RNA, Bacterial/metabolism; RNA, Ribosomal, 23S/chemistry; RNA, Ribosomal, 23S/genetics; RNA, Ribosomal, 23S/metabolism; Ribosomes/chemistry; Ribosomes/metabolism; Tubercidin/metabolism
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