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MMP-28, a new human matrix metalloproteinase with an unusual cysteine-switch sequence is widely expressed in tumors
1The Burnham Institute, 10901 North Torrey Pines Road, 92037, La Jolla, CA, USA.
Abstract:
We report the discovery, cloning, and characterization of a novel human matrix metalloproteinase (MMP-28) cDNA gene. The deduced 520-amino-acid sequence of MMP-28 includes a signal peptide, a prodomain with an unusual cysteine-switch PRCGVTD motif followed by the furin cleavage RRKKR site, a catalytic domain, a hinge-region and a hemopexin-like domain. On the basis of their structural characteristics, MMP-28 belongs to the MMP-19 subfamily. The genomic MMP-28 gene uniquely mapped to chromosome 17q11.2 includes eight exons and seven introns. The broad range of expression in carcinomas as well as normal adult and fetal tissues suggests an important functional role for MMP-28.
Insights
Researchers discovered and characterized a new human matrix metalloproteinase (MMP-28) gene. Its broad expression suggests MMP-28 plays a significant role in various tissues and carcinomas.
Area of Science:
- Molecular Biology
- Genetics
- Biochemistry
Background:
- Matrix metalloproteinases (MMPs) are crucial enzymes involved in extracellular matrix remodeling.
- Understanding novel MMPs is essential for elucidating their roles in physiological and pathological processes.
Purpose of the Study:
- To report the discovery, cloning, and initial characterization of a novel human matrix metalloproteinase, designated MMP-28.
- To analyze the structural features and genomic organization of the MMP-28 gene.
- To investigate the expression pattern of MMP-28 in various human tissues.
Main Methods:
- Gene discovery and cloning using molecular biology techniques.
- Sequence analysis to determine the deduced amino acid sequence and identify functional domains.
- Bioinformatic analysis for gene mapping and structural classification.
- Expression analysis in normal and cancerous human tissues.
Main Results:
- A novel human matrix metalloproteinase cDNA gene, MMP-28, was identified and cloned.
- The deduced 520-amino-acid sequence reveals characteristic MMP domains, including a signal peptide, prodomain with a unique cysteine-switch motif (PRCGVTD) and furin cleavage site (RRKKR), catalytic domain, hinge region, and hemopexin-like domain.
- MMP-28 structurally belongs to the MMP-19 subfamily.
- The MMP-28 gene, located on chromosome 17q11.2, comprises eight exons and seven introns.
- Broad expression of MMP-28 was observed in carcinomas and normal adult and fetal tissues.
Conclusions:
- The discovery of MMP-28 expands the repertoire of known human matrix metalloproteinases.
- The unique structural features and chromosomal location of MMP-28 warrant further investigation.
- The widespread expression pattern suggests a significant and potentially diverse functional role for MMP-28 in both normal physiology and disease states, particularly in carcinomas.