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By Charles W. Gehrke

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Sequence a n a l y s i s o f t R N A species may uncover a d d i t i o n a l tRNAs w i t h unusual f e a t u r e s as have been found i n m i t o c h o n d r i a l ones ( r e f . 11). T h i s may h e l p o u r understanding o f what f e a t u r e s a r e r e q u i r e d f o r t R N A f u n c t i o n (see a l s o t h e a r t i c l e on v i r a l RNAs and t R N A i n t h i s volume, r e f . 44). I n addition, organellar metabolisms may r e q u i r e t R N A f o r y e t unknown f u n c t i o n s as was seen i n t h e involvement o f t R N A i n c h l o r o p h y l l s y n t h e s i s ( r e f .

Ciechanover, R e g u l a t i o n o f t h e u b i q u i t i n , mediated p r o t e o l y t i c athway: r o l e o f t h e s u b s t r a t e -NH2 r o u p and o f t r a n s f e r "A, J. C e l l . , 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 .

D u r i n g t h e p a s t few y e a r s new experimental approaches o f g e n e t i c s and m o l e c u l a r b i o l o g y , i n a d d i t i o n t o modern b i o p h y s i c a l i n s t r u m e n t a t i o n , have opened t h e t R N A f i e l d t o i n n o v a t i v e a t t a c k and shed l i g h t on q u e s t i o n s which have vexed us f o r many years, Very l i t t l e m a t e r i a l i s now r e q u i r e d t o determine a t R N A sequence by r a p i d g e l sequencing methods ( r e f . l o ) , a l t h o u g h t h e unambiguous d e t e r m i n a t i o n o f t h e m o d i f i e d nucleosides c o n t a i n e d i n i t may t a k e much more m a t e r i a l We now know t h e sequences o f 413 tRNAs and 664 and time.

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