Question: What is the role of Ubiquitin-conjugating enzyme 9 in the sumoylation pathway?

Context:
["Among the proteins involved in the sumoylation pathway, Ubc9 is the sole E2-conjugating enzyme required for sumoylation and plays a central role by interacting with almost all of the partners required for sumoylation. ", "We also found a marked rise in levels of Ubc9, the only SUMO conjugation enzyme identified so far. ", "Ubiquitin-conjugating enzyme 9 (Ubc9), the sole conjugating enzyme for sumoylation, regulates protein function and plays an important role in sumoylation-mediated cellular pathways.", "We observed steady-state expression of SUMO1-3, SUMO-conjugated enzyme-UBC9 and deSUMOylating enzymes - SENPs, throughout normal gestation. ", "The small ubiquitin-like modifier (SUMO) pathway in eukaryotes is an essential post-translational modification required for a variety of cellular processes, development and organelle biogenesis. SUMO-conjugating enzyme (Ubc9) is an important conjunction enzyme in the SUMO pathway. ", "Western blot analysis, EMSA, ELISA, confocal microscopy and immunoprecipitation demonstrated that drastic tissue hypoxia, elevated levels of proteins conjugated by small ubiquitin-related modifier-1 (SUMO-1), Ubc9 (the only known conjugating enzyme for the sumoylation pathway) or HIF-1\u03b1, augmented sumoylation of HIF-1\u03b1, nucleus-bound translocation and enhanced transcriptional activity of HIF-1\u03b1 in RVLM neurons took place preferentially during the pro-life phase of experimental brain death. ", "Among the proteins involved in the sumoylation pathway, Ubc9 is the sole E2-conjugating enzyme required for sumoylation and plays a central role by interacting with almost all of the partners required for sumoylation.", "UBC9 is the only E2 conjugating enzyme involved in this process, and loss of UBC9 completely abolishes the SUMOylation pathway.", "Here we have identified host cell proteins involved with the cellular SUMOylation pathway, SUMO-1 (small ubiquitin-like modifier) and UBC9, a SUMO-1 conjugating enzyme that interact with classical swine fever virus (CSFV) Core protein.", "Ubiquitin-conjugating enzyme 9 (Ubc9), the sole conjugating enzyme for sumoylation, regulates protein function and plays an important role in sumoylation-mediated cellular pathways.", "In this study, we found that the SUMOylation pathway was involved in the DENV life cycle, since DENV replication was reduced by silencing the cellular gene Ubc9, which encodes the sole E2-conjugating enzyme required for SUMOylation.", "Here we demonstrate that the synaptic diffusion of Ubc9, the sole conjugating enzyme of the sumoylation pathway, is regulated by synaptic activity.", "The SUMO pathway parallels the classical ubiquitinylation pathway with three discrete steps: activation involving the enzyme E1, conjugation involving the E2 enzyme UBC9, and substrate modification through the cooperative association of UBC9 and E3 ligases.", "RAP80 interacts with the SUMO-conjugating enzyme UBC9 and is a novel target for sumoylation.", "Among the proteins involved in the sumoylation pathway, Ubc9 is the sole E2-conjugating enzyme required for sumoylation and plays a central role by interacting with almost all of the partners required for sumoylation.", "Although there are multiple E2 enzymes required for ubiquitination, there is only one E2-conjugating enzyme for sumoylation, which is Ubc9.", "Consistent with a role of sumoylation in inhibiting Tec1 activity, specifically increasing sumoylation of Tec1 by fusing it to the sumoylating enzyme Ubc9 leads to a dramatic decrease of Tec1 transcriptional activity.", "Ubc9 is an E2-conjugating enzyme required for sumoylation and has been implicated in regulating several critical cellular pathways.", "We also exposed placental explants to hypoxia to study the effect on the SUMOylation pathway.We observed steady-state expression of SUMO1-3, SUMO-conjugated enzyme-UBC9 and deSUMOylating enzymes - SENPs, throughout normal gestation", "It has been reported that ubiquitin-conjugating enzyme 9 (Ubc9), the unique enzyme2 in the sumoylation pathway, is up-regulated in many cancers", "Among the proteins involved in the sumoylation pathway, Ubc9 is the sole E2-conjugating enzyme required for sum

Answer: Ubiquitin-conjugating enzyme 9 (Ubc9) is the sole E2-conjugating enzyme required for sumoylation and plays a central role by interacting with almost all of the partners required for sumoylation.