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Bone morphogenetic protein-1 processes probiglycan.

I C Scott¹, Y Imamura, W N Pappano

¹Departments of Pathology and Laboratory Medicine and Biomolecular Chemistry University of Wisconsin, Madison, Wisconsin 53706, USA.

The Journal of Biological Chemistry

|July 18, 2000

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Bone morphogenetic protein-1 (BMP-1) processes probiglycan, generating mature biglycan essential for bone formation. This metalloprotease activity is crucial for extracellular matrix regulation in vertebrates.

Area of Science:

Biochemistry
Molecular Biology
Developmental Biology

Background:

Bone morphogenetic protein-1 (BMP-1) is a metalloprotease vital for extracellular matrix deposition, including processing fibrillar collagens.
Biglycan, a small leucine-rich proteoglycan, regulates bone formation and is synthesized as a precursor requiring cleavage for maturation.

Purpose of the Study:

To investigate the role of BMP-1 in processing probiglycan.
To identify the specific proteases responsible for probiglycan maturation.

Main Methods:

In vitro cleavage assays using BMP-1 and related proteases.
Analysis of biglycan processing in wild-type and genetically modified mouse embryo fibroblasts (MEFs).

Main Results:

Related Experiment Videos

BMP-1 directly cleaves probiglycan, yielding mature biglycan.
Mammalian Tolloid (MTL) and mammalian Tolloid-like 1 (mTLL-1) exhibit low probiglycan-cleaving activity.
MEFs lacking Bmp1 predominantly produce unprocessed probiglycan.
MEFs lacking both Bmp1 and Tll1 exclusively produce unprocessed probiglycan, indicating these genes account for all detectable activity.

Conclusions:

BMP-1 is the primary protease responsible for probiglycan processing in mouse embryo fibroblasts.
The combined action of BMP-1 and mTLL-1 accounts for all probiglycan processing activity in MEFs.
This processing is critical for generating mature biglycan involved in bone formation and extracellular matrix regulation.