Plant Biochemistry, Edition: 3d ed by James Bonner and Joseph E. Varner (Eds.)

By James Bonner and Joseph E. Varner (Eds.)

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Some results about the E. coli ribosomal proteins are compiled as an example in T a b l e V. All 21 proteins have been isolated and purified, and t h e molecular weights were determined. Protein SI (Berlin nomen­ clature) has by far the highest molecular weight of the 30 S ribosomal TABLE V S o m e C h a r a c t e r i s t i c s o f P r o t e i n s f r o m t h e 30 S S u b u n i t (E. Protein SI S2 S3 S4 S5 S6 S7 S8 S9 S10 Sll S12 S13 S14 S15 S16 S17 S18 S19 S20 S21 b Molecular weight R e q u i r e d for assembly 30,000 31,000 26,000 24,000 18,000 21,500 17,000 21,600 16,000 18,300 19,000 15,600 13,200 13,500 10,700 14,600 15,000 14,000 13,000 6 Stoichiometric classification c F F 65,000 + U + + + U U U U F + + « A f t e r K u r l a n d (1971,1972).

1974) f mitochondria; C, chloroplast. A v e r a g e d f r o m t h e heavy a n d l i g h t c o m p o n e n t s t h a t w e r e d e t e r m i n e d s e p a r a t e l y . 2. RIBOSOMES 33 mitochondrial 70 S ribosomal proteins are synthesized outside of the organelle, at least to such an extent t h a t the formation of new 70 S ribosomes is immediately stopped in the presence of cycloheximide, which inhibits protein synthesis on 80 S ribosomes (Kuntzel, 1969). There are most likely various degrees of independence, the mitochondria being less autonomous in this respect t h a n the chloroplast.

D. Replication of Chromosomes T h e D N A of chromatin m u s t replicate before cell division so t h a t each daughter cell can receive a full complement of the genetic informa­ tion. One enzyme t h a t m a y be involved with such replication is D N A polymerase I, first isolated from E. coli by Kornberg (1957) and Lehman et al. (1958) and described in plants by M o r y et al. (1974) and others. D N A polymerase catalyzes the polymerization of deoxyriboside triphos­ phates to new D N A chains provided only t h a t (1) D N A be present to be used as a template and (2) t h a t a primer molecule bound to singlestranded D N A is present.

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