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Target intelligence / Profile preview
Calmegin (CLGN)
- Target
- CLGN
- Molecular classification
- Molecular chaperone, Calcium-binding protein, Endoplasmic reticulum-associated protein
01
Overview
Calmegin is a testis-specific calcium-binding molecular chaperone protein localized to the endoplasmic reticulum of meiotic and post-meiotic germ cells. Its principal function is to assist in folding and assembly of key sperm membrane proteins, notably those required for sperm migration and sperm-zona pellucida binding during fertilization. Knockout mouse models lacking calmegin display male infertility due to defective processing of sperm membrane proteins rather than abnormalities in germ cell morphology. Calmegin expression is regulated throughout spermatogenesis, particularly during the stages of high sperm protein synthesis. There are no approved therapies targeting calmegin, and its role is restricted to male reproductive biology as a chaperone protein rather than as an enzyme, receptor, or transporter.
- Other names
- CalmeginCLGNtestis tissue sperm-binding protein Li 79P
02
Mechanism of action
Not applicable; no drugs targeting calmegin are currently known
03
Biological functions
Protein foldingSperm development (spermatogenesis)Male fertility
04
Disease associations
Infertility (male)Colloid adenoma (reported as associated; further validation needed)Carotid artery dissection (association reported; possible database artifact, not mechanistically established)
05
Safety considerations
Not applicable; no therapeutic targeting established, so safety concerns/challenges have not been characterized in humans
06
Biomarkers
Calmegin protein expression may serve as a marker for male germ cell differentiation and spermatogenesis, but is not an established clinical biomarker
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