Purification and Characterization of a Major Collagenase from<i>Streptomyces parvulus</i>
作者:Yasuko SAKURAI、Hideshi INOUE、Wataru NISHII、Takayuki TAKAHASHI、Yuichi IINO、Masayuki YAMAMOTO、Kenji TAKAHASHI
DOI:10.1271/bbb.80357
日期:2009.1.23
A major collagenase was purified about 96-fold from a crude enzyme sample of Streptomyces parvulus by chromatography on Q-Sepharose, Sephacryl S-200, and butyl-Toyopearl. The purified enzyme showed a relative molecular mass of approximately 52,000 on SDS–PAGE and a pH optimum at about 9.0, and was strongly inhibited by metal-chelating agents. It also cleaved 4-phenylazobenzyloxycarbonyl-Pro-Leu-Gly-Pro-d-Arg specifically at the Leu-Gly bond, with a K m value of 0.60 mm at pH 9.0 at 37 °C. Based on the amino acid sequences of the N-terminal region and internal tryptic peptides, the corresponding gene was cloned. The DNA sequence of the cloned gene indicated that the enzyme is produced as an 864-residue precursor protein with a 408-residue prepro sequence followed by a 456-residue mature enzyme moiety. The enzyme is most homologous with the collagenase from S. coelicolor, the identity being 73%, and it is thought to be a member of the Vibrio collagenase subfamily.
通过在 Q-Sepharose、Sephacryl S-200 和丁基-Toyopearl 上进行层析,从 Parvulus 链霉菌的粗酶样品中纯化出一种主要的胶原酶,纯化倍数约为 96 倍。纯化后的酶在 SDS-PAGE 上的相对分子质量约为 52,000,最适 pH 值约为 9.0,并受到金属螯合剂的强烈抑制。它还能特异性地裂解 4-苯基偶氮苄氧羰基-Pro-Leu-Gly-Pro-d-Arg 的 Leu-Gly 键,在 37 ℃、pH 值为 9.0 时的 K m 值为 0.60 mm。根据 N 端区域和内部胰蛋白酶肽的氨基酸序列,克隆了相应的基因。克隆基因的 DNA 序列表明,该酶是以 864 个残基的前体蛋白形式产生的,其中有 408 个残基的前导序列,随后是 456 个残基的成熟酶分子。该酶与 S. coelicolor 的胶原酶同源性最高,同源性为 73%,被认为是弧菌胶原酶亚家族的成员。