Crystallization and preliminary crystallographic analysis of Achromobacter protease i mutants

Len Ito, Kentaro Shiraki, Tatsuya Uchida, Masaki Okumura, Hiroshi Yamaguchi

Research output: Contribution to journalArticlepeer-review


Achromobacter protease I (API), a serine protease, shows an order of magnitude higher activity than bovine trypsin. The optimum pH of mutant enzymes with His210 replaced by Ser (H210S) and Trp169 replaced by Phe (W169F) has been shown to shift from approximately pH 9 (wild-type enzyme) to approximately pH 7 while retaining high activity. The mutants were crystallized by the hanging-drop vapour-diffusion technique with 2 M ammonium sulfate as the precipitant. The space group of the W169F mutant crystal was P1, with unit-cell parameters a = 42.6, b = 34.7, c = 69.5 Å, = 91.8, β = 97.5, γ = 89.9°, while the space group of the H210S mutant crystal was P21, with unit-cell parameters a = 42.4, b = 34.2, c = 67.7 Å, β = 97.6°. Diffraction data were collected from W169F and H210S crystals to resolutions of 2.0 and 2.3 Å, respectively.

Original languageEnglish
Pages (from-to)1531-1532
Number of pages2
JournalActa Crystallographica Section F: Structural Biology and Crystallization Communications
Issue number11
Publication statusPublished - 2010 Nov


  • catalytic triads
  • optimum pH shift
  • pH dependence
  • serine proteases


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