Journal
GENE
Volume 342, Issue 2, Pages 243-249Publisher
ELSEVIER
DOI: 10.1016/j.gene.2004.07.012
Keywords
Amblin; haemolymph; Kunitz-like domain; platelet aggregation; BPTI
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A novel thrombin inhibitor named Amblin was identified from the haemolymph of the ixodid (hard) tick, Amblyomma hebraeum, and the coding cDNA was isolated from a tick cDNA library. This cDNA codes for a preprotein of 166 amino acids, including a predicted signal peptide composed of 15 amino acids N-terminal to the mature Amblin. The 151-amino-acid mature Amblin contains 14 cysteines and two Kunitz-like domains. It displays high sequence similarity with a tissue factor pathway inhibitor (TFPI), Ixolaris, from the ixodid tick, Ixodes scapularis, which has 10 cysteines, and a thrombin inhibitor, Boophilin, from the ixodid tick, Boophilus microplus, which has 12 cysteines. Recombinant Amblin specifically inhibited thrombin as efficiently as native Amblin did. This is the first report of a thrombin inhibitor from tick haemolymph. (C) 2004 Elsevier B.V. All rights reserved.
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