Mitochondrial protein acylation and intermediary metabolism: regulation by sirtuins and implications for metabolic disease.
Level 5 - mechanism / opinion, no new human data
Narrative review of biochemical mechanisms and preclinical findings without primary human data.
PubMed 23086951 · doi:10.1074/jbc.R112.404863
What was done
The authors reviewed published literature on mitochondrial sirtuins (SIRT3, SIRT4, and SIRT5) and their roles as NAD(+)-dependent metabolic sensors that regulate intermediary metabolism through protein deacylation.
What was found
No quantitative clinical values are reported in the abstract. SIRT3 expression is selectively activated during fasting and calorie restriction, deacetylating and regulating enzymes including acetyl-CoA synthetase, long-chain acyl-CoA dehydrogenase, and 3-hydroxy-3-methylglutaryl-CoA synthase 2 to enhance fat metabolism. SIRT5 exhibits demalonylase and desuccinylase activity on abundant mitochondrial lysine modifications, while no convincing enzymatic activity was identified for SIRT4.
Why it matters
It synthesizes the mechanistic role of mitochondrial sirtuins in metabolic adaptation to fasting, highlighting post-translational acylation as a regulator of energy homeostasis and metabolic disease pathways.
Limits
This is a non-systematic narrative review summarizing bench and animal biochemistry. No original human clinical trial data, sample sizes, or quantitative outcome measures are reported.
Cited by
- supports Sirtuins are NAD-dependent enzymes that remove acetyl, acyl, or succinyl modifications from lysine residues on proteins to regulate enzymes and mediate gene silencing.