As already alluded to above, upon cleavage by thrombin, PAR3, rather than itself mediating intracellular signalling, functions as a cofactor facilitating thrombin-induced activation of PAR4[ 159]159].
Enzymes that are involved in connective tissue formation, neurotransmitter biosynthesis, iron transport and other essential physiological processes require copper as a cofactor to mediate their reactions.
This inhibition occurs at least in part via blocking the phosphorylation of CDK9, a p-TEFb complex member that serves as a cofactor for Tat-mediated transcription.
Folate mediates large metabolic fluxes mainly during photorespiration as a cofactor of the mitochondrial GDC/SHM (mentioned before) complex [ 86].
Besides acting as a cofactor for HIV, CXCR4 mediates the CXCL12-directed migration of cancer cells to metastatic sites through the promotion of angiogenesis and migration of tumor cells in breast, lung, ovarian, renal, prostate and neuroblastoma [22], [23], [24].
Although cofactor-lacking oxidases are reported (Fetzner and Steiner 2010), commonly used alcohol oxidases depend on flavin (Macheroux et al. 2011; Dijkman et al. 2013) or a metal (Cu) as a cofactor (Whittaker 2003), which mediates the electron transfer.
Factor H controls the activity of the alternative pathway C3/C5 convertase by competing with factor B for C3b binding and by serving as a cofactor for factor I, to mediate the cleavage of C3b to iC3b [ 29].
During collagen synthesis, alpha ketoglutarate functions as a cofactor that activates Prolyl-4-Hydroxylase (P4H), an enzyme that mediates the post-translational modification of pre-procollagen peptides essential for formation of the collagen triple helix.
VHL-dependent degradation of HIF-1α is known to require the presence of Fe2+ as a cofactor for the prolyl hydroxylases (PHDs), which hydroxylate HIF-1α at conserved proline residues, mediating proteasomal degradation (63).
Usually uses S-adenosylmethionine as a cofactor.
In our analysis, flowering time was considered as a cofactor.
