Collagenolytic serine-carboxyl proteinase from Alicyclobacillus sendaiensis strain NTAP-1: Purification, characterization, gene cloning, and heterologous expression

Naoki Tsuruoka, Toru Nakayama, Masako Ashida, Hisashi Hemmi, Masahiro Nakao, Hiroyuki Minakata, Hiroshi Oyama, Kohei Oda, Tokuzo Nishino

研究成果: ジャーナルへの寄稿学術論文査読

55 被引用数 (Scopus)

抄録

Enzymatic degradation of collagen produces peptides, the collagen peptides, which show a variety of bioactivities of industrial interest. Alicyclobacillus sendaiensis strain NTAP-1, a slightly thermophilic, acidophilic bacterium, extracellularly produces a novel thermostable collagenolytic activity, which exhibits its optimum at the acidic region (pH 3.9) and is potentially applicable to the efficient production of such peptides. Here, we describe the purification to homogeneity, characterization, gene cloning, and heterologous expression of this enzyme, which we call ScpA. Purified ScpA is a monomeric, pepstatin-insensitive carboxyl proteinase with a molecular mass of 37 kDa which exhibited the highest reactivity toward collagen (type I, from a bovine Achilles tendon) among the macromolecular substrates examined. On the basis of the sequences of the peptides obtained by digestion of collagen with ScpA, the following synthetic peptides were designed as substrates for ScpA and kinetically analyzed: Phe-Gly-Pro-Ala*Gly-Pro-Ile-Gly (kcat, 5.41 s-1; Km, 32 μM) and Met-Gly-Pro-Arg*Gly-Phe-Pro-Gly-Ser (kcat, 351 s-1; Km, 214 μM), where the asterisks denote the scissile bonds. The cloned scpA gene encoded a protein of 553 amino acids with a calculated molecular mass of 57,167 Da. Heterologous expression of the scpA gene in the Escherichia coli cells yielded a mature 37-kDa species after a two-step proteolytic cleavage of the precursor protein. Sequencing of the scpA gene revealed that ScpA was a collagenolytic member of the serine-carboxyl proteinase family (the S53 family according to the MEROPS database), which is a recently identified proteinase family on the basis of crystallography results. Unexpectedly, ScpA was highly similar to a member of this family, kumamolysin, whose specificity toward macromolecular substrates has not been defined.

本文言語英語
ページ(範囲)162-169
ページ数8
ジャーナルApplied and Environmental Microbiology
69
1
DOI
出版ステータス出版済み - 2003 1月 1

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