Identification, sequence analysis and expression of transcripts encoding a putative metalloproteinase, eMDC II, in...

Area of Science:

• Biochemistry
• Molecular Biology
• Reproductive Biology

Background:

• The metalloproteinase-like, disintegrin-like, cysteine-rich (MDC) family comprises sequence-related proteins found in both reproductive and non-reproductive tissues.
• MDC proteins share domains homologous to reprolysins and snake venom hemorrhagic factors, suggesting potential enzymatic functions.
• Several MDC proteins are highly expressed in the male reproductive tract, implying roles in fertility.

Purpose of the Study:

• To clone, sequence, and characterize the human and macaque orthologues of a novel MDC family member, designated eMDC II.
• To investigate the potential proteolytic activity of eMDC II based on its conserved domains.

Main Methods:

• Cloning and sequence determination of eMDC II transcripts from human and macaque (Macaca fascicularis).
• Bioinformatic analysis of the deduced protein sequence, focusing on conserved domains and catalytic sites.
• Comparison of eMDC II sequence features with known metalloproteinases and reprolysins.

Main Results:

• The novel eMDC II gene and its transcripts were successfully cloned and sequenced in humans and macaques.
• eMDC II is abundantly expressed in the epididymis, a key site for sperm maturation.
• eMDC II exhibits an extended 'catalytic centre' consensus sequence, characteristic of active reprolysin-like metalloproteinases.

Conclusions:

• eMDC II represents a newly identified member of the MDC protein family with significant expression in the epididymis.
• The structural characteristics of eMDC II strongly suggest it possesses metalloproteinase activity.
• Further research into eMDC II's function could elucidate its role in male reproductive processes.