Lysozyme-like protein 1 (LYZL1)

Lysozyme-like protein 1 (LYZL1) is a member of the glycoside hydrolase family 22 and shares homology with classical c-type lysozymes, which are well-established enzymes involved in the degradation of bacterial cell wall peptidoglycans. LYZL1 encodes a secreted protein, mainly predicted to reside in the extracellular region, with conserved structural features such as disulfide bridges and a lysozyme-like fold. While canonical lysozymes possess antimicrobial activity, LYZL1 and its close paralogs exhibit substitutions in key catalytic residues, often resulting in the retention of substrate-binding grooves but reduced or absent enzymatic activity. Functional studies suggest LYZL1 and related lysozyme-like proteins have evolved specialized, enzymatically attenuated variants potentially involved in mammalian reproduction, especially fertilization and sperm-egg interaction, rather than primary innate immune defense. There are no established drugs targeting LYZL1, and no recognized role as a therapeutic target or biomarker in clinical settings at this time. Key molecular/functional details: - It is a protein-coding gene located at human chromosome 10q23.31, encoding a ~14–15 kDa protein. - The structure retains critical cysteine residues and the characteristic lysozyme signature motif, but typical catalytic residues (Glu35 and Asp52 in classic lysozymes) are substituted in LYZL-family proteins, decreasing canonical enzymatic activity. - Strong conservation and structural similarity with other testis/sperm-specific lysozyme-like proteins (SLLP1, LYZL2–6), indicating possible reproductive specialization. - Associated with hereditary systemic amyloidosis by homology (not empirical clinical validation for LYZL1 specifically). - No direct evidence links LYZL1 with specific biomarkers, safety issues, or interacting drugs as of the current literature.

Other names

Lysozyme-like protein 1LYZL1LYC2LYZD1UNQ648/PRO1278MGC33408KAAG648PRO1278bA534G20.1lysozyme D1