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Primary structure of human proacrosin deduced from its cDNA sequence
T Baba1, K Watanabe, S Kashiwabara
1Institute of Applied Biochemistry, University of Tsukuba, Ibaraki, Japan.
FEBS Letters
|February 27, 1989
Summary
Researchers identified cDNA clones for human proacrosin, the inactive form of acrosin, from a human testis library. This study details the genetic sequence and predicted structure of human proacrosin, crucial for sperm function.
Area of Science:
- Reproductive Biology
- Molecular Genetics
- Enzymology
Background:
- Acrosin is a key protease in sperm capacitation and the acrosome reaction.
- Proacrosin is the zymogen precursor to active acrosin.
- Understanding human proacrosin structure is vital for reproductive research.
Purpose of the Study:
- To isolate and characterize cDNA clones encoding human proacrosin.
- To predict the amino acid sequence and structural features of human proacrosin.
- To identify potential active-site residues.
Main Methods:
- Screening a human testis cDNA library using a boar acrosin cDNA probe.
- Nucleotide sequencing of isolated cDNA clones.
- Bioinformatic analysis to predict protein sequence and structure.
Main Results:
- Isolation of cDNA clones encoding human proacrosin.
- Prediction of a 19-amino acid N-terminal signal peptide.
- Identification of light and heavy chains, with the heavy chain containing the catalytic site and a proline-rich C-terminus.
Conclusions:
- The deduced sequence provides a detailed blueprint of human proacrosin.
- The proline-rich C-terminus may influence protein folding or function.
- Predicted active-site residues (His, Asp, Ser) are conserved, suggesting functional similarity to other serine proteases.