PMID-sentid Pub_year Sent_text comp_official_name comp_offsetprotein_name organism prot_offset 1706595-0 1991 Endogenous cleavage of the Arg-379-Ala-380 bond in vitronectin results in a distinct conformational change which "buries" Ser-378, its site of phosphorylation by protein kinase A. Activation of blood platelets by thrombin was previously shown to specifically release protein kinase A, which in human plasma singles out and phosphorylates one protein, identified as vitronectin. Serine 122-125 vitronectin Homo sapiens 51-62 1706595-0 1991 Endogenous cleavage of the Arg-379-Ala-380 bond in vitronectin results in a distinct conformational change which "buries" Ser-378, its site of phosphorylation by protein kinase A. Activation of blood platelets by thrombin was previously shown to specifically release protein kinase A, which in human plasma singles out and phosphorylates one protein, identified as vitronectin. Serine 122-125 vitronectin Homo sapiens 365-376 1706595-3 1991 1 mol/mol), that it is targeted to one site (Ser-378) at the C-terminal edge of the heparin-binding domain, and that it distinguishes between the two physiologically occurring forms of vitronectin: the one-chain (75 kDa) form, and the nicked two-chain (65 + 10 kDa) form, held together by an interchain disulphide bridge. Serine 45-48 vitronectin Homo sapiens 185-196 1706595-5 1991 Cleavage of the Arg-379-Ala-380 bond results therefore in a conformationally distinct form of vitronectin in which Ser-378 is "buried". Serine 115-118 vitronectin Homo sapiens 94-105 1706595-6 1991 This is demonstrated by our finding that Ser-378 is present in the 65 kDa chain of clipped vitronectin but inaccessible to phosphorylation at physiological pH. Serine 41-44 vitronectin Homo sapiens 91-102