JmjC Histone Demethylases: Beyond Histone Lysine Demethylation

Area of Science:

• Biochemistry
• Epigenetics
• Molecular Biology

Background:

• Jumonji C histone lysine demethylases (JmjC-KDMs) are crucial chromatin modifiers.
• Their primary function is histone lysine demethylation, impacting gene expression.
• Emerging evidence suggests JmjC-KDMs possess a wider catalytic repertoire.

Purpose of the Study:

• To review recent advancements in JmjC-KDM activities beyond canonical histone demethylation.
• To explore novel enzymatic functions such as arginine demethylation and hydroxylation.
• To discuss factors influencing JmjC-KDM substrate selectivity and enzymatic outcomes.

Main Methods:

• Literature review of recent studies on JmjC-KDM biochemistry and function.
• Analysis of sequence-reactivity, inter-domain interactions, and post-translational modifications (PTMs).
• Examination of cellular context effects on JmjC-KDM enzymatic activity.

Main Results:

• JmjC-KDMs catalyze arginine demethylation and hydroxylation, expanding their known functions.
• Substrate selectivity is modulated by sequence-activity relationships, protein domains, PTMs, and cellular environment.
• Significant mechanistic flexibility exists within the JmjC-KDM family.

Conclusions:

• JmjC-KDM biochemical activities are more diverse than previously understood.
• These findings necessitate a re-evaluation of the link between JmjC-KDM biochemistry and physiological roles.
• Insights are critical for developing targeted JmjC-KDM inhibitors and advancing epigenetic regulation research.