Promiscuous protein biotinylation by Escherichia coli biotin protein ligase.

  • Choi-Rhee E
  • Schulman H
  • Cronan J
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Abstract

Biotin protein ligases (BPLs) are enzymes of extraordinary specificity. BirA, the BPL of Escherichia coli biotinylates only a single cellular protein. We report a mutant BirA that attaches biotin to a large number of cellular proteins in vivo and to bovine serum albumin, chloramphenicol acetyltransferase, immunoglobin heavy and light chains, and RNAse A in vitro. The mutant BirA also self biotinylates in vivo and in vitro. The wild type BirA protein is much less active in these reactions. The biotinylation reaction is proximity-dependent in that a greater extent of biotinylation was seen when the mutant ligase was coupled to the acceptor proteins than when the acceptors were free in solution. This approach may permit facile detection and recovery of interacting proteins by existing avidin/streptavidin technology.

Author-supplied keywords

  • acyl adenylate
  • acylating
  • biotin protein ligase
  • biotinylation
  • biotinylation of proteins has
  • bira
  • cal means
  • chemi-
  • protein amino groups
  • protein modification
  • routinely been done by
  • usually by modification of
  • with biotin-n-hydroxysuccinimide or similar

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Authors

  • Eunjoo Choi-Rhee

  • Howard Schulman

  • John E Cronan

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