Evolution of a new enzyme activity from the same motif fold

Petr G. Leiman, Ian J. Molineux

Research output: Contribution to journalComment/debatepeer-review

31 Scopus citations


The host cell recognition protein of the Escherichia coli bacteriophage HK620 is a large homotrimeric tailspike that cleaves the O18A1 type O antigen. The crystal structure of HK620 tailspike determined in the apo and substrate-bound form is reported by Barbirz et al. in this issue of Molecular Microbiology. Lacking detectable sequence similarity, the fold and overall organization of the HK620 tailspike are similar to those of the tailspikes of the related phages P22 and Sf6. The substrate-binding site is intrasubunit in P22 and HK620 tailspikes, but intersubunit in Sf6, demonstrating how phages can adapt the same protein fold to recognize different substrates.

Original languageEnglish (US)
Pages (from-to)287-290
Number of pages4
JournalMolecular Microbiology
Issue number2
StatePublished - Jul 2008
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Molecular Biology


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