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Studies on degradation of adenosine-5′-phosphosulphate (APS) and adenosine-3′-phosphate-5′-phosphosulphate (PAPS) in extracts of Anabaena cylindrica

Plant Science Letters, ISSN: 0304-4211, Vol: 6, Issue: 2, Page: 103-110
1976
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  • Citations
    12
    • Citation Indexes
      12

Article Description

[ 35 S]Adenosine-5′-phosphosulphate ([ 35 S]APS) and [ 35 S]adenosine-3′-phosphate-5′-phosphasulphate ([ 35 S]PAPS) were rapidly degraded by extracts of Anabaena cylindrica. The loss of radioactivity from these sulphur nucleotides resulted in a corresponding increase of free 35 SO 4  in the incubation mixture. The soluble fraction of the broken cells (S 75 ) hydrolysed both PAPS and APS, whereas the pellet fractions (P 20 and P 75 ) hydrolysed PAPS only. The degradation of [ 35 S]PAPS was almost completely suppressed by various 5′-adenine nucleotides, 3′-AMP, nucleotide triphosphates or pyrophosphate, while glucose-6-phosphate, phosphate ions and sodium sulphite were less effective. The hydrolysis of [ 35 S]APS was prevented by sodium fluoride and 5′-AMP, but 3′-AMP was ineffective.

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