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GrpE protein homolog 1, mitochondrial (GRPEL1)
- Target
- GRPEL1
- Molecular classification
- Other (nucleotide exchange factor), Chaperone binding partner (HSP70 system co-chaperone)
01
Overview
GrpE protein homolog 1, mitochondrial (GRPEL1) is a co-chaperone in the mitochondrial matrix that acts as the main nucleotide exchange factor (NEF) for mitochondrial Hsp70 (also known as mortalin). GRPEL1 is essential for protein folding, complex assembly, and the import of proteins into mitochondria by facilitating the exchange of ADP for ATP in the chaperone cycle. It forms homodimers and interacts directly with mortalin (mtHSP70) to promote substrate release and maintain proteostasis within the mitochondria. Disruption or loss of GRPEL1 impairs mitochondrial function, resulting in rapid muscle atrophy and systemic bioenergetic failure in mammals. It is not currently a therapeutic drug target but is indispensable for normal mitochondrial biology and cellular metabolism[1][2][3][5][6][7].
- Other names
- GRPEL1GrpE-like protein cochaperoneGRPEGRP-like protein 1GRPELGREPEL1FLJ25609hMGEHMGEmt-GrpE#1GrpEGrpE protein homolog 1, mitochondrial
02
Biological functions
Protein foldingProtein complex assemblyMitochondrial protein importRegulation of protein homeostasis (proteostasis)Facilitation of nucleotide exchange in Hsp70 chaperone cycle
03
Disease associations
Other (essential for mitochondrial function and muscle maintenance)Implicated in muscle atrophy upon loss of functionInvolvement in mitochondrial protein import stress response
04
Safety considerations
Essential for mitochondrial function—loss results in severe muscle atrophy and multisystem failure in animal modelsNo therapeutic targeting attempted; interventions affecting GRPEL1 would likely be deleterious
05
Biomarkers
ACOX2 (peroxisomal Acyl-CoA oxidase 2, induced upon GRPEL1 loss as a stress marker in muscle)CHCHD10 (upregulated in response to GRPEL1 loss, linked to protein import stress in mitochondria)
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