Abstract
Calcium-binding proteins were isolated from zebrafish (Brachidanio rerio) eggs by the method of precipitation with acidic phospholipids in the presence of calcium ions. The revealed proteins separated by SDS-PAGE were identified by mass spectrometric tryptic peptide fingerprinting. The proteins included annexins A2a, A1a, A13.1, and A5. In addition, copine III, a member of the recently described copine family of C2 domain-containing proteins, was identified. Total RNA was analyzed in mature oocytes by RT-PCR and transcripts of two different annexin A13 forms (A13.1 and A13.2) as well as of annexin A3 were detected. Thus, the presence of both proteins and mRNAs of annexins has been shown in the zebrafish egg.
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