Miscoding by Escherichia coli tRNAs for Methionine, Cysteine and Valine in the Synthesis of Rabbit Globin
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study of cohesive devices in the textbook of english for the students of apsychology by rastegarpour
this study investigates the cohesive devices used in the textbook of english for the students of psychology. the research questions and hypotheses in the present study are based on what frequency and distribution of grammatical and lexical cohesive devices are. then, to answer the questions all grammatical and lexical cohesive devices in reading comprehension passages from 6 units of 21units th...
The synthesis of methionine by suspensions of Escherichia coli.
The first indication that p-aminobenzoic acid is concerned in the synthesis of methionine by microorganisms was the observation that methionine, under appropriate conditions, overcame inhibition of growth by sulphonamides in a non-competitive manner (Harris & Kohn, 1941; Kohn, 1943; Bliss & Long, 1941). Since then methionine has frequently been shown with various organisms to be an essential co...
متن کاملProcessing of the seven valine tRNAs in Escherichia coli involves novel features of RNase P
Here we report that RNase P is required for the initial separation of all seven valine tRNAs from three distinct polycistronic transcripts (valV valW, valU valX valY lysY and lysT valT lysW valZ lysY lysZ lysQ). Particularly significant is the mechanism by which RNase P processes the valU and lysT polycistronic transcripts. Specifically, the enzyme initiates processing by first removing the Rho...
متن کاملOxidation of cysteine 645 of cobalamin-independent methionine synthase causes a methionine limitation in Escherichia coli.
Cobalamin-independent methionine synthase (MetE) catalyzes the final step in Escherichia coli methionine biosynthesis but is inactivated under oxidative conditions, triggering a methionine deficiency. This study demonstrates that the mutation of MetE cysteine 645 to alanine completely eliminates the methionine auxotrophy imposed by diamide treatment, suggesting that modulation of MetE activity ...
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ژورنال
عنوان ژورنال: European Journal of Biochemistry
سال: 1970
ISSN: 0014-2956,1432-1033
DOI: 10.1111/j.1432-1033.1970.tb01019.x