By Michael Locke

ISBN-10: 0123955556

ISBN-13: 9780123955555

ISBN-10: 0323157564

ISBN-13: 9780323157568

Cytodifferentiation and Macromolecular Synthesis

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Sei. S. 4 5 , 1 2 8 0 - 1 2 8 8 . CRICK, F. Η . C , GRIFFITH, J . C , AND ORGEL, L . E . (1957). Codes w i t h o u t commas. Proc. Natl. Acad. Sei. S. 4 3 , 4 1 6 - 4 2 1 . FINCHAM, J . R . S. (1960). Genetically controlled differences in enzyme activity. Advances in Enzymol. 2 2 , 1 - 4 3 . HELINSKI, D . R . , AND YANOFSKY, C. (1962). T h e correspondence between genetic a n d the position of a m i n o acid a l t e r a t i o n in a p r o t e i n . Proc. Natl. Acad. Sei. S. 4 8 , 173-183. , AND YANOFSKY, C.

At high temperature, the repression systems are inactivated, an effect which results in a constitutive synthesis of /3-galactosidase or in the production of phage. This type of mutation has rather dramatic consequences in phage. Lysogenic bacteria carrying such a mutant R* prophage can easily grow at low temperature. When shifted to high temperature, however, all the bacteria lyse and release phage. The mutant prophage behaves as a thermosensitive lethal factor for the host. These repression systems are able to react with specific metabolites present inside the cell or introduced from outside.

It is clear from our studies with suppressor genes that the primary struc­ ture of the A protein can be altered by mutations outside the A gene. Re­ gardless of the mechanism by which this primary structure change is ac­ complished, it is obvious that organisms have the ability to translate a nucleotide sequence into two or more slightly different proteins. ACKNOWLEDGMENTS T h e s e investigations w e r e s u p p o r t e d by grants f r o m the National Science F o u n d a t i o n a n d the U n i t e d States P u b l i c Health Service.

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Cytodifferentiation and Macromolecular Synthesis by Michael Locke


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