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Updated: Jun 3, 2026
Production, Crystallization and Structure Determination of C. difficile PPEP-1 via Microseeding and Zinc-SAD
Published on: December 30, 2016
Cloning, expression, purification, crystallization and preliminary X-ray diffraction analysis of an ASCH
Suk-Youl Park1, Jeong-Hoh Park, Jeong-Sun Kim
1Department of Chemistry, Chonnam National University, Gwangju 500-757, Republic of Korea.
Abstract:
The human activating signal cointegrator 1 (ASC-1) homology (ASCH) domain is frequently observed in many organisms, although its function has not yet been clearly defined. In Zymomonas mobilis ZM4, the ZMO0922 gene encodes a polypeptide that includes an ASCH domain (zmASCH). To provide a better structural background for the probable role of ASCH domain-containing proteins, the ZMO0922 gene was cloned and expressed. The purified protein was crystallized from 30%(w/v) polyethylene glycol 400, 0.1 M cacodylic acid pH 6.5 and 0.2 M lithium sulfate. Diffraction data were collected to 2.1 Å resolution using synchrotron radiation. The crystal belonged to the primitive trigonal space group P3(1)21 or P3(2)21, with unit-cell parameters a=b=51.67, c=207.30 Å, α=β=90, γ=120°. Assuming the presence of one molecule in the asymmetric unit gave a Matthews coefficient of 4.69 Å(3) Da(-1), corresponding to a solvent content of 73.7%.
