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Extra resources for Mechanisms of Saccharide Polymerization and Depolymerization

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In a l l t i s s u e s considered, sucrose c l e a v a g e c a t a ­ l y z e d by s u c r o s e s y n t h e t a s e , and s u c r o s e s y n t h e s i s c a t a l y z e d by s u c r o s e p h o s p h a t e s y n t h e t a s e c o u p l e d t o s u c r o s e p h o s p h a t e p h o s p h a t a s e would be g o i n g on s i m u l t a n e o u s l y . Thus, a f u t i l e c y c l e would e x i s t where t h e r e c y c l i n g of s u c r o s e would have as i t s o n l y consequence the d i s s i p a t i o n of energy through h y d r o l y s i s o f ATP a c c o r d i n g t o t h e f o l l o w i n g r e a c t i o n s : UDP-glucose + fructose-6-P > UDP + sucrose-6-P sucrose-6-P ^ s u c r o s e + P-^ s u c r o s e + UDP > UDP-glucose + f r u c t o s e + ATP > f r u c t o s e - 6 - P + ADP ATP > ADP + fructose Pi The f r u c t o k i n a s e n e c e s s a r y f o r t h e c y c l e o p e r a t i o n h a s b e e n r e p o r t e d t o e x i s t i n many p l a n t t i s s u e s ( 1 1 , 1 2 ) .

And P o n t i s , H . G . , Acta Physiol. Latinoamer. 26, 319 ( 1 9 7 6 ) . S u . J . C . , and P r e i s s , J . , Plant Physiol. 61, 389 ( 1 9 7 8 ) . W o l o s i u k , R . A . , P h . D . t h e s i s , Buenos A i r e s U n i v e r s i t y (1974). W o l o s i u k , R . A . , and P o n t i s , H . G . , FEBS Lett. 16, 237 (1971). P r e s s e y , R . , Plant Physiol. 44, 759 ( 1 9 6 9 ) . T s a i , C . Y . , Phytochemistry 13, 885 ( 1 9 7 4 ) . W o l o s i u k , R . A . , and P o n t i s , H .

S . , J . B i o l . C h e m . 2 5 3 , 1832 ( 1 9 7 8 ) . P a z u r , J . Η . , A n d e r s o n , J . S . , a n d K a r a k a w a , W. W . , J . B i o l . C h e m . 2 4 6 , 1793 ( 1 9 7 1 ) . P a z u r , J . Η . , a n d S h u e y , E . W . , J . B i o l . C h e m . 2 3 6 , 1780 (1961). G a b r i e l , Ο . , i n "Carbohydrates i n S o l u t i o n " (H. S. I s b e l l , e d . ) . A d v . Chem. S e r i e s 117, p . 387. American Chemical S o c i e t y , Washington (1973). P a z u r , J . Η . , a n d A n d e r s o n , J .

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