Abstract
We report the cDNA sequence of a leech hemerythrin. A cDNA was isolated from a Theromyzon tessulatum cDNA library and encodes a 120 amino acid protein of about 14 kDa. The predicted protein contains the hemerythrin signature sequence and the iron ligand residues previously identified in crystal structures of hemerythrin and myohemerythrin. The protein displayed the highest identity to myohemerythrin, a non-heme iron-binding protein described in sipunculids. Expression analysis indicated that the mRNA is widely expressed in leech and is stage specific in appearance, being absent after the two first blood meals, appearing after the last blood meal during the period preceding oogenesis and disappearing after egg laying.
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