The Protein Denitrosylase SCoR2 Regulates Lipogenesis and Fat Storage

Yes, the protein denitrosylase SCoR2 (SNO–CoA reductase 2) plays a central role in regulating lipogenesis (the process of lipid synthesis) and fat storage, as revealed in the research article. SCoR2 is proposed to act as a metabolic regulator, akin to sirtuins, but through controlling protein S-nitrosylation rather than acetylation.

Here is a detailed explanation of how SCoR2 regulates lipogenesis and fat storage:

### 1. **Role in Adipose Tissue:**

• **Promotion of Fat Storage:** SCoR2 promotes fat storage by denitrosylating the cytoskeletal regulator myosin 9 (Myh9). This denitrosylation suppresses actomyosin assembly, which is essential for enabling the activation of key lipogenic transcription factors.
• **Activation of Lipogenic Transcription Factors:** These transcription factors include PPARγ, SREBP1, and CEBPα, which are vital for adipocyte differentiation and lipid synthesis. By activating these factors, SCoR2 drives the processes that lead to fat accumulation in adipose tissue.
• **Impact of SCoR2 Loss or Inhibition:** When SCoR2 is lost or inhibited, the S-nitrosylation of Myh9 increases, disrupting the transcriptional programs required for lipogenesis. This limits the expansion of adipose tissue, effectively reducing fat storage.

### 2. **Role in the Liver:**

• **Targeting Lipogenic Enzymes:** In the liver, SCoR2 directly targets enzymes involved in de novo lipogenesis, such as ATP citrate lyase (ACLY) and fatty acid synthase (FASN). These enzymes are critical for synthesizing lipids.
• **Effect of Inhibition or Deletion:** When SCoR2 is inhibited or deleted, it increases the S-nitrosylation of ACLY and FASN, thereby reducing lipid synthesis. At the same time, this inhibition promotes fatty acid oxidation, which helps to break down fats.
• **Protection Against Fat Accumulation:** This dual effect of reduced lipid synthesis and increased fat oxidation protects the liver from fat accumulation and injury, which are hallmarks of metabolic dysfunction–associated steatotic liver disease (MASLD).

### 3. **SCoR2 as a Therapeutic Target:**

• The study identifies SCoR2 as a promising therapeutic target for obesity and MASLD. By targeting SCoR2, it may be possible to simultaneously limit lipid synthesis, enhance fat oxidation, and improve overall metabolic health.
• This approach could address the root causes of excess lipid accumulation in adipose tissue and liver, which are central to the development of obesity and related metabolic disorders.

### Conclusion:

SCoR2 regulates lipogenesis and fat storage through its denitrosylase activity, influencing key molecular pathways in both adipose tissue and liver. Its role as a metabolic regulator highlights its potential as a target for therapeutic strategies aimed at combating obesity, MASLD, and other lipid-related metabolic dysfunctions.