NCIt definition : A 527 amino acid glycoprotein and the modified form of the naturally occurring human
plasminogen activator (tPA) with tissue plasminogen activating activity. Tenecteplase
(TNKase) is a serine protease created by introducing substitutions of threonine 103
with asparagine, asparagine 117 with glutamine within the kringle 1 domain, and a
tetra-alanine substitution at amino acids 296-299 in the protease domain. TNKase converts
fibrin-bound plasminogen to plasmin by cleaving the Arg/Val bond in plasminogen. Plasmin
in turn degrades the fibrin matrix of the thrombus mass, thereby helps eliminate blood
clots or arterial blockages that cause myocardial infarction.;