High-resolution crystals of methionine aminopeptidase from Pyrococcus furiosus obtained by water-mediated transformation

Tahir H. Tahirov, Hideyuki Oki, Tomitake Tsukihara, Kyoko Ogasahara, Katsuhide Yutani, Clare Peters Libeu, Yukiko Izu, Susumu Tsunasawa, Ikunoshin Kato

Research output: Contribution to journalArticle

15 Scopus citations

Abstract

The monoclinic crystal form of methionine aminopeptidase from Pyrococcus furiosus (MAP-Pfu) has been crystallized from four different conditions. Native crystals belong to space group P21 with typical unit-cell dimensions a = 53.4, b = 85.1, c = 72.7 Å, β = 107.7°and diffract to 2.9-4.5 Å resolution. However, there is a problem of nonisomorphism among the crystals. Water-mediated transformation to low-humidity form occurs by reduction of the relative humidity of crystal environment to 79%. The unit-cell dimensions of transformed crystals are a = 51.9, b = 83.3, c = 70.3 Å, β = 105.9°, and the calculated solvent content is 3.9% less than in original crystals. Transformation to low-humidity form is accompanied by 1.7 times reduction of overall temperature factors, extension of diffraction resolution up to 1.75 Å, without change or reduction of crystal mosaicity, and improvement in stability to X-ray radiation. The water-mediated transformation also appears to relieve the problem of nonisomorphism among the original MAP-Pfu crystals.

Original languageEnglish (US)
Pages (from-to)68-72
Number of pages5
JournalJournal of Structural Biology
Volume121
Issue number1
DOIs
StatePublished - 1998

ASJC Scopus subject areas

  • Structural Biology

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