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Cloning, purification, crystallization and preliminary structural studies of penicillin V acylase from Bacillus subtilis.

Acta Crystallogr. Sect. F Struct. Biol. Cryst. Commun.2005 Jul 01;61(Pt 7):680-3. Epub 2005 Jun 15
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摘要


Penicillin acylase proteins are amidohydrolase enzymes that cleave penicillins at the amide bond connecting the side chain to their beta-lactam nucleus. An unannotated protein from Bacillus subtilis has been expressed in Escherichia coli, purified and confirmed to possess penicillin V acylase activity. The protein was crystallized using the hanging-drop vapour-diffusion method from a solution containing 4 M sodium formate in 100 mM Tris-HCl buffer pH 8.2. Diffraction data were collected under cryogenic conditions to a spacing of 2.5 A. The crystals belonged to the orthorhombic space group C222(1), with unit-cell parameters a = 111.0, b = 308.0, c = 56.0 A. The estimated Matthews coefficient was 3.23 A3 Da(-1), corresponding to 62% solvent content. The structure has been solved using molecular-replacement methods with B. sphaericus penicillin V acylase (PDB code 2pva) as the search model.

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