Abstract
We report the sequence of the proteinase inhibitor with a wide inhibition spectrum, α-2-macroglobulin (α2M), belonging to the thioester superfamily of proteins. This is the first α2M sequence from coenogastropod prosobranch snails. The full-length cDNA was cloned by RACE method, spans 7897 bp and contains an open reading frame of 5460 bp. The ORF encodes a protein of 1819 amino acids. The deduced mature protein contains 1795 amino acids with a molecular weight of 200 kDa and isoelectric point of 5.00. Littorina littorea α2M bears 4 conserved α2M domains and one internal thioester. Phylogenetic analysis showed that the sequence forms well supported cluster with Mollusca species and other representatives of Lophotrochozoa.
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