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1. Isolated rat lens capsules synthesized hydroxy[3H]proline-containing polypeptides when incubated with [3H]proline. 2. The collagenous polypeptides synthesized during a 2 h incubation were analyzed by both gel-filtration chromatography and sodium dodecyl sulphate/polyacrylamide-gel electrophoresis and shown to have an apparent mol.wt. of approx. 180,000. 3. No evidence was obtained for conversion of these polypeptides into a lower-molecular-weight species in experiments where capsules were labelled for 2 h and chased with non-radioactive proline for up to 22 h. However, a time-dependent incorporation of the 180,000-mol.wt. species into a larger collagenous component was observed and this could be prevented by the inclusion of beta-aminopropionitrile in the incubation medium. 4. The radioactive components synthesized by the capsules correspond to subunits of the intact lens capsule and the direct incorporation of the polypeptide of mol.wt. 180,000 into deoxycholate-insoluble basement membrane was demonstrated.

Studies on the assembly of the rat lens capsule. Biosynthesis and partial characterization of the collagenous components