- 1.
Catch was induced in the spine ligaments of Strongylocentrotus franciscanus (Agassiz) (surrounding muscle and nervous tissue removed) by mechanical agitation.
- 2.
When the catch mechanism is set, the tensile stiffness of urchin ligament can change by nearly an order of magnitude and approaches that of vertebrate tendon.
- 3.
Deflection of a spine in catch through an angle of more than 10° damages the catch mechanism.
- 4.
Setting of catch depends on extracellular calcium.
- 5.
Transglutaminase inhibitors (cadaverine and putrescine) prevent the setting of catch.
- 6.
A model involving Ca-dependent activation of a transglutaminase-like enzyme is discussed as a possible basis for the setting of catch by cross-linking collagen fibrils.
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© 1984 by Company of Biologists
1984
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