Commentaries in Plant Science by Harry Smith

By Harry Smith

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A specific mechanism must therefore exist t o transport into the chloroplast both the small subunit and all the other chloroplast proteins which the inhibitor data suggest are made on cytoplasmic ribosomes. There appears to be no evidence for either pores or pinacytosis in the chloroplast envelope, and such phenomena anyway seem too crude t o account for the specific nature of the uptake. Attempts to study the uptake of proteins by isolated chloroplasts, and t o investigate the nature of the proteins in isolated chloroplast envelopes, are required before it is useful t o suggest mechanisms for the movement of proteins across chloroplast envelopes.

Preparations of large subunit which are homogenous on SDS Polyacrylamide gels can be resolved into three bands of nearly equal intensity by electrofocussing on gels containing 77 7 8 8 7 urea, while the small subunit is resolved into one t o four bands depending on the species ' ' . The patterns obtained are characteristic of each species, and so provide useful phenotypic markers for both chloroplast and nuclear genomes. The exact nature of the differences between the large subunit bands is unknown, but they are likely to be small, because the number of tryptic peptides is that expected 78 from the arginine and lysine c o n t e n t .

Sei. USA. 69 (1972) 3146-3150. 10. 11. J. H. Stimulation of chromatin-bound R N A polymerase by a soluble factor. Biochim. biophys. Acta 224 (1970) 667-670. A. In vitro auxin binding t o particulate cell fractions from corn coleoptiles. Planta 107 (1972) 325-340. 12. , BRACKER, C E . W. Purification of an ionstimulated adenosine triphosphatase from plant roots: association with plasma membranes. Proc. natn. Acad. Sei. USA. 69 (1972) 3307-3311. 13. V. E. Gibberellic acid-induced synthesis of protease by isolated aleurone layers of barley.

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