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Structure-function relationships in the collagenase family member transin
R Sanchez-Lopez1, R Nicholson, M C Gesnel
1Laboratoire de Génétique Moléculaire des Eucaryotes, Institut National de la Santé et de la Recherche Médicale, Faculté de Médecine, Strasbourg, France.
The Journal of Biological Chemistry
|August 25, 1988
Summary
Researchers developed a novel system to study transin proteinase activity. This system facilitates the investigation of transin
Area of Science:
- Biochemistry
- Molecular Biology
- Enzymology
Background:
- Transin is a member of the collagenase proteinase family.
- Understanding transin's structure-function relationship is crucial for its biological role.
Purpose of the Study:
- To develop a system for studying transin proteinase activity.
- To elucidate the functional domains of transin.
- To investigate the role of specific sequences in transin activation and activity.
Main Methods:
- Transfection of Cos cells with a fusion protein vector (Protein A-transin).
- Purification of latent transin using IgG-Sepharose.
- Activation of latent transin using 4-aminophenylmercuric acetate.
- Site-directed mutagenesis of transin sequence variants.
Main Results:
- A system was established to secrete and activate latent transin.
- Transin was proposed to have an N-terminal proteinase domain and a C-terminal hemopexin-like domain.
- Mutations in the PRCGVPDV sequence increased spontaneous activation.
- Mutations in a putative zinc-binding site inactivated transin's proteinase activity.
Conclusions:
- The developed system enables the study of transin proteinase.
- The hemopexin-like domain is not essential for inhibitor binding or maintaining latency.
- The PRCGVPDV sequence is critical for regulating transin activation.
- A zinc-binding region is likely part of transin's active site.