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By Charles W. Gehrke

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Extra resources for Chromatography and Modification of Nucleosides, Part B: Biological Roles and Function of Modification

Example text

34 (1987) 81-180 A. Schon, G. Krupp, S . Gough, S . 'G. Kannangara, and D. M. K. A. R. E. P r a t h e r , The E . 3-459 F. Tamura, S . Nishimura and M. Ohki, The E . , 3 (1984) 1103,7. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. W. 6. 7. 5. 9 B11 35. 36. 37. 38. 39. 40. 41. 42. 43. 44. J. A. F. Chater P l e i t r o p i c morphol o g i c a l and a n t i b i o t i c d e f i c i e n c i e s r e s u i t f r o m m u t a t i o n s i n a gene encoding a tRNA-like p r o d u c t i n S t r e p t o r n y c e s c o e l i c o l o r A3(2 , Genes and Development, i n p r e s s .

When f u l l y m o d i f i e d , t h e tRNA recognizes t h e codon AUA and i s aminoacylated w i t h i s o l e u c i n e . B u t i f an unmodified C occupies t h e f i r s t anticodon p o s i t i o n , t h e n t h e t R N A w i l l be charged w i t h m e t h i o n i n e and recognizes t h e codon AUG. OUTLOOK What excitement w i 11 f u t u r e research b r i n g ? With developments o c c u r r i n g as r a p i d l y as i n t h e p a s t few y e a r s i t i s d i f f i c u l t t o p r e d i c t .

O f course, I do n o t wish t o i m p l y t h a t n u c l e o t i d e m o d i f i c a t i o n i n t R N A i s more i m p o r t a n t t h a n t h a t o c c u r r i n g i n o t h e r n u c l e i c a c i d species found i n t h e c e l l . Rather, i t s i g n i f i e s t h e h i s t o r i c a l f a c t t h a t t R N A has been t h e m a j o r source o f m o d i f i e d nucleosides s t u d i e d t o date. I n p a r t t h i s i s due t o t h e u b i q u i t o u s presence o f t R N A i n t h e cytoplasm and i n t h e o r g a n e l l e s o f c e l l s , b u t p r i m a r i l y because t R N A i s t h e most abundant source o f m o d i f i e d n u c l e o t i d e s amongst n u c l e i c a c i d s .

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