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Evolution of vitamin B2 biosynthesis: structural and functional similarity between pyrimidine deaminases of eubacterial and plant origin.

J Biol Chem. 2004 Aug 27;279(35):36299-308. Epub 2004 Jun 18
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摘要


The Arabidopsis thaliana open reading frame At4g20960 predicts a protein whose N-terminal part is similar to the eubacterial 2,5-diamino-6-ribosylamino-4(3H)-pyrimidinone 5'-phosphate deaminase domain. A synthetic open reading frame specifying a pseudomature form of the plant enzyme directed the synthesis of a recombinant protein which was purified to apparent homogeneity and was shown by NMR spectroscopy to convert 2,5-diamino-6-ribosylamino-4(3H)-pyrimidinone 5'-phosphate into 5-amino-6-ribosylamino-2,4(1H,3H)-pyrimidinedione 5'-phosphate at a rate of 0.9 micromol mg(-1) min(-1). The substrate and product of the enzyme are both subject to spontaneous anomerization of the ribosyl side chain as shown by (13)C NMR spectroscopy. The protein contains 1 eq of Zn(2+)/subunit. The deaminase activity could be assigned to the N-terminal section of the plant protein. The deaminase domains of plants and eubacteria share a high degree of similarity, in contrast to deaminases from fungi. These data show that the riboflavin biosynthesis in plants proceeds by the same reaction steps as in eubacteria, whereas fungi use a different pathway.

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