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Category > Chemistry Posted 27 Apr 2017 My Price 6.00

bioeynthesis of cytidine triphoaphate

1. In the bioeynthesis of cytidine triphoaphate, sphnspnmisnsyr risphoapt'rate {PRPP} reacts with
el'otete to give the rbonucleotide oretidine rrronophospahte {DHP} as shown behw. The
ribonuceotitte formation takes place by a nucleophilc substimtion reaction cetaiyzett by the
enzyme orotate phosphorhosylltansferase. [1D pts] sis Hijfi'tfi/ et—
5 s“ tr mm“ For? ”HP
:3} In the first step of this reaction FRFP generates a resonance stabilized carbocation. Using
curried arrows propose a mechanism hetow tor the formation of this carbocation and provide a resonance structure aiso using arrows to show the new of electrons in its torrnetion.
3} ‘D-F—CI
I o “i spines ” / O carbocafion b} Using owed arrows, propose a mechanism below for the DRIP-forming reaction of the
carbonation above 1ilr'ith orotate. Note that: the enzyme p-I'e'tiltt-ee e hose {:5} that to useful here.
o b}

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(15)
Status NEW Posted 27 Apr 2017 04:04 AM My Price 6.00

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