All-trans-retinoic acid (atRA), an activated metabolite of vitamin A, is incorporated covalently into proteins both in vivo and in vitro. AtRA reduced the transport activity of the oxoglutarate carrier (OGC) isolated from testes mitochondria to 58% of control via retinoylation reaction. Labeling of testes mitochondrial proteins with 3HatRA demonstrated the binding of atRA to a 31.5 KDa protein. This protein was identified as OGC due to the competition for the labeling reaction with 2-oxoglutarate, the specific OGC substrate. The role of retinoylated proteins is currently being explored and here we have the first evidence that retinoic acids bind directly to OGC and inhibit its activity in rat testes mitochondria via retinoylation reaction. This study indicates the evidence of a specific interaction between atRA and OGC and establishes a novel mechanism for atRA action, which could influence the physiological biosynthesis of testosterone in situations such as retinoic acid treatment. © 2008 Elsevier B.V. All rights reserved.

Influence of all-trans-retinoic acid on oxoglutarate carrier via retinoylation reaction

Cione E.;Genchi G.
2009

Abstract

All-trans-retinoic acid (atRA), an activated metabolite of vitamin A, is incorporated covalently into proteins both in vivo and in vitro. AtRA reduced the transport activity of the oxoglutarate carrier (OGC) isolated from testes mitochondria to 58% of control via retinoylation reaction. Labeling of testes mitochondrial proteins with 3HatRA demonstrated the binding of atRA to a 31.5 KDa protein. This protein was identified as OGC due to the competition for the labeling reaction with 2-oxoglutarate, the specific OGC substrate. The role of retinoylated proteins is currently being explored and here we have the first evidence that retinoic acids bind directly to OGC and inhibit its activity in rat testes mitochondria via retinoylation reaction. This study indicates the evidence of a specific interaction between atRA and OGC and establishes a novel mechanism for atRA action, which could influence the physiological biosynthesis of testosterone in situations such as retinoic acid treatment. © 2008 Elsevier B.V. All rights reserved.
2-Oxoglutarate carrier
Retinoic acid
Retinoylation reaction
Animals
Ethylmaleimide
Hydrogen-Ion Concentration
Male
Membrane Transport Proteins
Mice
Mice, Inbred BALB C
Mitochondria
Rats
Testis
Tretinoin
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.11770/309788
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