Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 102, Issue 44, Pages 15815-15820Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.0507705102
Keywords
coenzyme A; posttranslational modification; Bacillus subtillis; phage display
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Funding
- NHLBI NIH HHS [R01 HL032854, HL32854, R37 HL032854] Funding Source: Medline
- NIGMS NIH HHS [F32 GM020011, GM58213, R01 GM058213, GM20011, R01 GM020011] Funding Source: Medline
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An 11-residue peptide with the sequence DSLEFIASKLA was identified from a genomic library of Bacillus subtilis by phage display as an efficient substrate for Sfp phosphopantetheinyl transferase-catalyzed protein labeling by small molecule-CoA conjugates. We name this peptide the ybbR tag, because part of its sequence is derived from the ybbR ORF in the B. subtilis genome. The site of Sfp-catalyzed ybbR tag labeling was mapped to the underlined Ser residue, and the ybbR tag was found to have a strong tendency for adopting an a-helical conformation in solution. Here we demonstrate that the ybbR tag can be fused to the N or C termini of target proteins or inserted in a flexible loop in the middle of a target protein for site-specific protein labeling by Sfp. The short size of the ybbR tag and its compatibility with various target proteins, the broad substrate specificity of Sfp for labeling the ybbR tag with small-molecule probes of diverse structures, and the high specificity and efficiency of the labeling reaction make Sfp-catalyzed ybbR tag labeling an attractive tool for expanding protein structural and functional diversities by posttranslational modification.
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