FASTK post-transcriptional regulators - a 'FAST-tracK' in mitochondrial gene expression

Area of Science:

• Mitochondrial biology
• Molecular genetics
• Biochemistry

Background:

• Fas-activated serine/threonine kinase (FASTK) proteins are key regulators of mitochondrial gene expression.
• Their C-terminus shares homology with endoribonucleases, but catalytic activity remains unclear.
• FASTK proteins control RNA processing, maturation, stability, and translation.

Purpose of the Study:

• To summarize current knowledge on FASTK protein functions in mitochondrial gene regulation.
• To highlight the roles of FASTK, FASTKD4, and FASTKD5 in mitochondrial mRNA metabolism.
• To explore the molecular organization and RNA-binding mechanisms of FASTK proteins.

Main Methods:

• Review of genetic and genomic studies.
• Analysis of recent biochemical and structural data.
• Integration of artificial intelligence-based prediction models.

Main Results:

• FASTK proteins utilize RNA-binding to regulate diverse mitochondrial gene expression stages.
• The conserved C-terminus is crucial for RNA binding.
• Recent advances offer molecular insights into FASTK architecture and regulation.

Conclusions:

• FASTK proteins play specialized, vital roles in maintaining mitochondrial transcriptome balance.
• Understanding FASTK molecular mechanisms is advancing due to new structural and biochemical data.
• The C-terminus is a key determinant of FASTK's RNA-binding capabilities.