Crystallization of a soluble form of the Kexlp serine carboxypeptidase fromSaccharomyces cerevisiae

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Abstract
A soluble form of the killer factor and prohormone-processing carboxypeptidase, “KexlΔp,” from Saccharomyces cerevisiae, has been crystallized in 17–22% poly (ethylene glycol) methyl ether (average Mr = 5, 000), 100 mM ammonium acetate, 5% glycerol, pH 6.5, at 20 °C. A native data set (2.8 Å resolution) and four derivative data sets (3.0–3.2 Å resolution) were collected at the Photon Factory (λ = 1.0 Å). The crystals belong to space group P212121 with a = 56.6 Å, b = 84.0 Å, c= 111.8 Å. Freezing a KexlΔp crystal has facilitated the collection of a 2.4-Å data set using a rotating anode source (λ = 1.5418 Å). Molecular replacement models have been built based on the structures of wheat serine carboxypeptidase (CPDW-II; Liao DI et al., 1992, Biochemistry 31:9796–9812) and yeast carboxypeptidase Y (CPD-Y; Endrizzi JA, Breddam K, Remington SJ, 1994, Biochemistry 33:11106–11120).