A novel calcium-binding peptide from the cuticle of the crayfish, Procambarus clarkii
A novel calcium-binding peptide from the cuticle of the crayfish, Procambarus clarkii
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DOI：
10.1016/j.bbrc.2004.04.075
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发表时间：
2004-06-04
影响因子：
3.1
通讯作者：
Nagasawa, H
中科院分区：
文献类型：
--
作者：
Inoue, H;Ohira, T;Nagasawa, H
A novel peptide named calcification-associated peptide (CAP)-2 was isolated from the exoskeleton of the crayfish, Procambarus clarkii. CAP-2 consists of 65 amino acid residues and has a 44% sequence identity with CAP-1 characterized previously. It has a chitin-binding domain observed in many arthropod cuticle proteins. CAP-2 showed inhibitory activity on calcium carbonate precipitation and chitin-binding ability. A CAP-2 cDNA was cloned using RT-PCR and RACE and the open reading frame encoded a precursor peptide consisting of a signal peptide and CAP-2. RT-PCR revealed that CAP-2 mRNA was exclusively expressed in the epidermal tissue during the postmolt stage, the site and stage being associated with calcification. Calcium-binding assay using recombinant CAP-2 revealed that this peptide had affinity for calcium ions with a K-d value of about 1 mM. All these results suggest that CAP-2 serves as a nucleator or a regulator in the calcification of the exoskeleton. (C) 2004 Elsevier Inc. All rights reserved.
