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Procollagen IV. Association to tetramers.
The Journal of Biological Chemistry
|May 10, 1983
Summary
Procollagen IV molecules self-assemble into tetramers at their NH2 ends. Disulfide bonds stabilize these tetramers, a process influenced by glutathione and cell culture conditions.
Area of Science:
- Biochemistry
- Cell Biology
- Extracellular Matrix Research
Background:
- Procollagen IV is a key component of basement membranes.
- Understanding procollagen IV assembly is crucial for tissue development and repair.
Purpose of the Study:
- To investigate the self-assembly mechanism of procollagen IV tetramers.
- To identify factors influencing tetramer formation.
Main Methods:
- Isolation of procollagen IV from mouse endodermal cell line PF-HR9.
- Identification of tetramers using electron microscopy, velocity sedimentation, and electrophoresis.
- Investigation of tetramer formation in cell cultures and with isolated molecules.
Main Results:
- Procollagen IV molecules form NH2-terminal tetramers.
- Tetramer formation involves initial noncovalent association followed by disulfide bond stabilization.
- Glutathione promotes disulfide-linked tetramer formation even in alkylated molecules.
- Cystine in cell culture media interferes with tetramer assembly.
Conclusions:
- Procollagen IV molecules can spontaneously associate into tetramers.
- Disulfide bonds are essential for stabilizing these tetramers.
- Tetramer formation is an intrinsic property of procollagen IV, independent of other matrix molecules.