Disintegrins and C-type lectin-like venom proteins

Disintegrins and C-type lectin-like venom proteins (Snaclecs) are two distinct families of non-enzymatic proteins found in snake venoms that target the mammalian hemostatic system [1][2]. Disintegrins are small, cysteine-rich peptides that typically contain an RGD or KGD motif, which allows them to bind with high affinity to integrin receptors, most notably the platelet-specific integrin alpha-IIb/beta-3 [1]. By blocking these receptors, disintegrins prevent the binding of fibrinogen and other adhesive ligands, effectively inhibiting platelet aggregation and thrombus formation [3]. C-type lectin-like proteins are usually heterodimeric proteins that, despite their name, often lack carbohydrate-binding activity and instead interact with various platelet receptors like Glycoprotein Ib (GPIb) and Glycoprotein VI (GPVI), as well as coagulation factors [2]. These interactions can lead to either the activation or inhibition of platelet function, depending on the specific protein structure [3]. While these proteins are toxins, they have served as invaluable templates for drug design; for instance, the antiplatelet drug eptifibatide was developed based on the structure of a disintegrin [4]. Beyond cardiovascular applications, these proteins are also being explored for their ability to inhibit angiogenesis and tumor metastasis by interfering with integrin-mediated cell signaling [1].

Other names

Snake venom disintegrinsSnaclecsC-type lectin-related proteinsCLRPsVenom C-type lectins

Disintegrins competitively inhibit integrin receptors (e.g., alpha-IIb/beta-3) via RGD/KGD motifs to prevent fibrinogen binding [1][4]. C-type lectin-like proteins (Snaclecs) bind to platelet receptors such as Glycoprotein Ib (GPIb), Glycoprotein VI (GPVI), or CLEC-2, as well as coagulation factors, to either activate or inhibit platelet aggregation and the coagulation cascade [2][3].