Molecular cloning of a cDNA that encodes a serine protease with chymotryptic and collagenolytic activities in the hepatopancreas of the shrimp Penaeus vanameii (Crustacea, Decapoda)

FEBS Letters

Sellos, Daniel¹  Van Wormhoudt, Alain¹ 

[1] Laboratoire de Biologie Marine, Collège de France, BP 225, 29182 Concarneau cedex France

关键词: Chymotrypsin;    Collagenase;    cDNA nucleotide sequence;    Invertebrate;    Crustacea;   

DOI  :  10.1016/0014-5793(92)80777-E

学科分类：生物化学/生物物理

来源: John Wiley & Sons Ltd.

【 摘 要 】

Two clones were isolated by screening a shrimp hepatopancreas cDNA library with a DNA fragment obtained by PCR amplification using two oligonucleotides based on the partial protein sequence of Penaeus vanamei chymotrypsin purified earlier. One of these clones, PVC 7 contains a complete cDNA coding for a serine protease. The deduced amino acid sequence shows the existence of a 270 residue-long preproenzyme containing a highly hydrophobic signal peptide of 14 amino acids. This suggests the existence of a putative zymogen form of the enzyme containing a 30 amino acid-long peptide which is cleaved to give a mature protein of 226 residues. A highly preferred codon usage is observed for this protein. The other obtained cDNA was found to encode the less predominant variant of the protein. Sequence alignments show that shrimp chymotrypsin is highly homologous with crab collagenase (77% homology taking into account the same amino acid at the same position, and 83% homology taking into account amino acids wall conserved function) and that it is more similar to mouse trypsin (41% homology of strictly conserved amino acids) than to hornet chymotrypsin (35% homology).

【 授权许可】

Unknown