Deactivation by S-Glutathionylation overrules activation by PRMT1-dependent asymmetrical di-methylation in PFKFB3

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Jeong-Do Kim Young-Sun Yim Michal Brylinski Raafat El-Maghrabi Yong Lee

Abstract

To understand PFKFB3 control by covalent modifications, the structure/function effect of protein arginine methyl transferase 1-dependent asymmetric di-methylations at Arg131 and Arg134 (N-CH3) and its relationship to S-glutathionylation at Cys206 (S-Gsh) was investigated. Distinctly from the report that N-CH3 is for protection of PFKFB3 from the APC/C-Cdh-mediated polyubiquitination and proteolysis, an increase in the activity for Fru-2,6-P2 production was shown from a molecular simulation and in-vitro tests. The simulation suggested that N-CH3 would uncouple the Fru-6-P entry turn (-130TRERRH-) from its coupling to the p-helix (-204DKCDRD-) by disabling the interaction between Arg131/134 and Asp207. The uncoupling consequently is likely to facilitate the Fru-6-P binding by enhancing the conformational flexibility.


Confirming the simulation, N-CH3 was shown to cause a 5-fold increase in the specific activity (kcat/Km) mostly through a 4-fold decrease in Kms for Fru-6-P. A similar extent of activation was induced by Asp207àA mutagenesis, which disables the coupling, while the activation by N-CH3 was almost abolished by Arg131àA mutagenesis. More interestingly, PFKFB3 with N-CH3 could be additionally S-glutathionylated at Cys206, when oxidative stress is elevated. When modified by both N-CH3 and S-Gsh, the activity was decreased, as if there was no N-CH3 at all, suggesting that the deactivation completely overrules the activation.


When HeLa cells were treated for the dual modifications of PFKFB3, the overruling deactivation effect of S-Gsh was prevalent, causing decreases in Fru-2,6-P2 levels and increases in glycolytic flux redirected to the pentose phosphate pathway. As a result, the levels of NADPH and reduced glutathione were markedly elevated, enhancing cell viability under the conditions of elevated oxidative stress. Altogether, it is suggested that the functional effect of S-Gsh, which represents a mechanism for survival under detrimental oxidative stress, dominates over the effect of N-CH3, which has been suggested as a mechanism for growth. 

Article Details

How to Cite
KIM, Jeong-Do et al. Deactivation by S-Glutathionylation overrules activation by PRMT1-dependent asymmetrical di-methylation in PFKFB3. Medical Research Archives, [S.l.], v. 10, n. 1, jan. 2022. ISSN 2375-1924. Available at: <https://esmed.org/MRA/mra/article/view/2654>. Date accessed: 28 nov. 2022. doi: https://doi.org/10.18103/mra.v10i1.2654.
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Research Articles

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