Evolution of Negative Cooperativity in Glutathione Transferase Enabled Preservation of Enzyme Function - Aix-Marseille Université Access content directly
Journal Articles Biological Chemistry Year : 2016

Evolution of Negative Cooperativity in Glutathione Transferase Enabled Preservation of Enzyme Function

Abstract

Negative cooperativity in enzyme reactions - in which the first event makes subsequent events less favorable - is sometimes well understood at the molecular level, but its physiological role has often been obscure. Negative cooperativity occurs in human glutathione transferase (GST) GSTP1-1 when it binds and neutralizes a toxic nitric oxide adduct, the dinitrosyl-diglutathionyl iron complex (DNDGIC). However, the generality of this behavior across the divergent GST family and its evolutionary significance were unclear. To investigate, we studied 16 different GSTs, revealing that negative cooperativity is present only in more recently evolved GSTs, indicating evolutionary drift in this direction. In some variants, Hill coefficients were close to 0.5, the highest degree of negative cooperativity commonly observed (though smaller values of nH are theoretically possible). As DNDGIC is also a strong inhibitor of GSTs, we suggest negative cooperativity might have evolved to maintain a residual conjugating activity of GST against toxins even in the presence of high DNDGIC concentrations. Interestingly, two human isoenzymes that play a special protective role - safeguarding DNA from DNDGIC - display a classical half-of-the-sites interaction. Analysis of GST structures identified elements that could play a role in negative cooperativity in GSTs beside the well-known lock-and-key and clasp motifs, other alternative structural interactions between subunits may be proposed for a few GSTs. Taken together, our findings suggest the evolution of self-preservation of enzyme function as a novel facility emerging from negative cooperativity.
Fichier principal
Vignette du fichier
zbc26739.pdf (2.49 Mo) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

hal-01415918 , version 1 (09-06-2023)

Identifiers

Cite

Alessio Bocedi, Raffaele Fabrini, Mario Lo Bello, Anna Caccuri, Giorgio Federici, et al.. Evolution of Negative Cooperativity in Glutathione Transferase Enabled Preservation of Enzyme Function. Biological Chemistry, 2016, pp.jbc.M116.749507. ⟨10.1074/jbc.M116.749507⟩. ⟨hal-01415918⟩

Collections

CNRS UNIV-AMU
114 View
1 Download

Altmetric

Share

Gmail Facebook X LinkedIn More