Description
GTPαS (Sp isomer) is a non-hydrolyzable analog of GTP. It contains a sulfur atom replacing one of the non-bridging oxygen atoms in the triphosphate chain. The Sp isomer specifically refers to the stereoisomer where the sulfur atom occupies a particular spatial orientation. This compound is widely used in biochemical research to study G-protein signaling pathways, as it can activate G-proteins but is resistant to hydrolysis, thereby providing sustained signaling