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Unformatted text preview: • Two a-helical regions separated by a turn in the protein structure • Helix-turn-helix motif f ts into major groove of DNA • Most repressor proteins A positive regulator increases transcription of genes • AraC is a positive regulator for all arabinose genes which break down sugar arabinose • Loss of function mutation results in little or no expression of genes 2 In eukaryotes, RNA is processed after transcription • A 5 ± methylated cap and a 3 ± Poly-A tail are added • Structure of the methylated cap Poly-A tail is added to 3 ± end of eukaryotic mRNA Poly-A tail is added to 3 ± end of eukaryotic mRNA...
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This note was uploaded on 02/22/2010 for the course BIO 51980 taught by Professor Buskirk during the Fall '06 term at University of Texas.
- Fall '06