Abstract
Hydra minicollagen, the shortest collagen known, is an important component of the nematocyst wall, which has a very high tensile strength. It has an unusual structure, with small and closely related Cys-rich domains at both ends of its chains. Three chains are trimerized by a central collagenous domain. Polyhydroxyproline helices connect the Cys-rich domains with the collagenous domain. The minicollagen precursor contains three internal disulfide bridges in each Cys-rich domain and no disulfide bridges between chains of the same trimeric molecule or between different molecules. Biochemical and structural evidence as well as confocal immunofluorescence microscopy points to disulfide-mediated assembly during maturation of nematocysts.
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