How to fix a broken protein: restoring function to mutant human cystathionine β-synthase

Area of Science:

• Biochemistry
• Genetics
• Metabolic Disorders

Background:

• Inborn errors of metabolism (IEM) are genetic diseases affecting cellular metabolism, often caused by missense mutations.
• Cystathionine beta-synthase (CBS) deficiency, an IEM, leads to elevated homocysteine and various tissue phenotypes.
• Current treatments (diet, vitamins) for CBS deficiency have limited efficacy.

Purpose of the Study:

• To review the potential of modulating the intracellular protein folding environment as a therapeutic strategy for CBS deficiency.
• To discuss the advantages and disadvantages of using proteostasis modulators for CBS deficiency.

Main Methods:

• Review of existing literature on proteostasis networks and their role in CBS deficiency.
• Analysis of how intracellular protein folding impacts CBS protein conformation.
• Examination of proteostasis modulators as a therapeutic approach.

Main Results:

• Over 85% of CBS mutations are missense, causing protein misfolding and loss of function.
• The proteostasis network (chaperones, ubiquitin/proteasome system) influences CBS folding.
• Proteostasis modulators can potentially correct misfolded CBS proteins.

Conclusions:

• Modulating the proteostasis network is a promising therapeutic strategy for CBS deficiency.
• This approach may offer benefits for patients with limited response to conventional therapies.
• Further research is needed to evaluate the pros and cons of proteostasis modulation for CBS deficiency.