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Primary structure of a putative serine protease specific for IGF-binding proteins
1M.E. Müller-Institut für Biomechanik, Universität Bern, Switzerland.
FEBS Letters
|December 2, 1996
Summary
Researchers discovered a new 51 kDa protein in human fibroblasts that is absent in SV40-transformed cells. This transformation-sensitive protein, related to bacterial serine proteases, may regulate insulin-like growth factors (IGFs).
Area of Science:
- Molecular biology
- Biochemistry
- Cell biology
Background:
- Transformation-sensitive proteins play crucial roles in cellular regulation.
- Insulin-like growth factors (IGFs) are critical for cell growth and development.
- IGF-binding proteins modulate IGF availability and activity.
Purpose of the Study:
- To identify and characterize novel proteins involved in cellular transformation.
- To investigate the function of a newly discovered transformation-sensitive protein.
Main Methods:
- Subtracted cDNA library construction and screening.
- Protein characterization including molecular mass determination.
- Sequence homology analysis to identify protein families.
Main Results:
- A novel cDNA clone encoding a 51 kDa transformation-sensitive protein was isolated from human fibroblasts.
- The protein is expressed in normal fibroblasts but not in SV40-transformed counterparts.
- The protein shows high homology to the HtrA family of bacterial serine proteases and possesses an N-terminal IGF-binding domain.
Conclusions:
- The novel protein is likely involved in regulating IGF availability by cleaving IGF-binding proteins.
- Its absence in transformed cells suggests a role in preventing or reversing transformation.
- This protein represents a potential target for understanding and treating cancer.