文章基本信息

标题：Amino Acid Sequence of a Trypsin Inhibitor from a Spirometra (Spirometra erinaceieuropaei)
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作者：Akihiro SANDA ; Akihiko UCHIDA ; Tadashi ITAGAKI 等
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2001
卷号：24
期号：12
页码：1356-1361
DOI：10.1248/bpb.24.1356
出版社：The Pharmaceutical Society of Japan
摘要：A trypsin inhibitor that is highly homologous with bovine pancreatic trypsin inhibitor (BPTI) was co-purified along with RNase from Spirometra (Spirometra erinaceieuropaei). The amino acid sequence of this inhibitor (SETI) and the nucleotide sequence of the cDNA encoding this protein were determined by protein chemistry and gene technology. SETI contains 68 amino acid residues and has a molecular mass of 7798 Da. SETI has 31 amino acid residues that are identical with BPTI’s sequence, including 6 half-cystine and 5 aromatic amino acid residues. The active site Lys residue in BPTI is replaced by an Arg residue in SETI. SETI is an effective inhibitor of trypsin and moderately inhibits α-chymotrypsin, but less inhibits elastase or subtilisin. SETI was expressed by E. coli containing a PelB vector carrying the SETI encoding cDNA; an expression yield of 0.68 mg/l was obtained. The phylogenetic relationship of SETI and the other BPTI-like trypsin inhibitors was analyzed using most likelihood inference methods.
关键词：trypsin inhibitor;Spirometra;Spirometra erinaceieuropaei;amino acid sequence;nucleotide sequence;expression