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Target intelligence / Profile preview
Sperm acrosome-associated protein 5B (SPACA5B)
- Target
- SPACA5B
- Molecular classification
- Other (Lysozyme-like protein; sperm-specific protein; not a classic enzyme, receptor, transporter, or ion channel)
01
Overview
Sperm acrosome-associated protein 5B (SPACA5B) is a member of the lysozyme-like family specifically expressed in sperm, where it is predicted to localize to the acrosome and sperm flagellum[3]. It is thought to play a role in sperm-egg membrane fusion during fertilization and may have lysozyme-related activity, though likely without traditional bacteriolytic function. SPACA5B is closely related to SPACA5 and LYZL family proteins, which are involved in the structural and functional integrity of the acrosome, essential for successful fertilization[3]. No therapeutics currently target this protein, and it is not considered a mainstream therapeutic target, but defects or mutations could potentially contribute to infertility phenotypes. No significant safety or biomarker utility currently exists for this protein.
- Other names
- Sperm acrosome-associated protein 5SPACA5LYZL5SPACA5AUNQ6288/PRO20753SLLP-XLYZL5BLysozyme-like protein 5Sperm-specific lysozyme-like protein X
02
Mechanism of action
Not applicable (no known drugs interact with or target SPACA5B)
03
Biological functions
Likely involved in fusion of sperm to egg plasma membrane during fertilization[3]Predicted lysozyme activity, though possibly lacks classical bacteriolytic function[3]Involved in acrosome function and sperm head organization
04
Disease associations
Infertility (by analogy to other acrosomal/sperm membrane proteins; directly associated with Taylor’s syndrome)[3]Other (no established links to cancer, inflammation, infection, etc.)
05
Safety considerations
None identified, as it is not a current drug target
06
Interacting drugs
None known
07
Biomarkers
None established for patient selection or efficacy monitoring
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