Thepur3gene from thepurcluster encodes a monophosphatase essential for puromycin biosynthesis inStreptomyces
In: FEBS Letters, Jg. 580 (2006-02-24), S. 1807-1811
Online
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Zugriff:
The pur3 gene of the puromycin (pur) cluster from Streptomyces alboniger is essential for the biosynthesis of this antibiotic. Cell extracts from Streptomyces lividans containing pur3 had monophosphatase activity versus a variety of mononucleotides including 3′-amino-3′-dAMP (3′-N-3′-dAMP), (N6,N6)-dimethyl-3′-amino-3′-dAMP (PAN-5′-P) and AMP. This is in accordance with the high similarity of this protein to inositol monophosphatases from different sources. Pur3 was expressed in Escherichia coli as a recombinant protein and purified to apparent homogeneity. Similar to the intact protein in S. lividans, this recombinant enzyme dephosphorylated a wide variety of substrates for which the lowest Km values were obtained for the putative intermediates of the puromycin biosynthetic pathway 3′-N-3′-dAMP (Km=1.37mM) and PAN-5′-P (Km=1.40mM). The identification of this activity has allowed the revision of a previous proposal for the puromycin biosynthetic pathway.
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Thepur3gene from thepurcluster encodes a monophosphatase essential for puromycin biosynthesis inStreptomyces
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Autor/in / Beteiligte Person: | Jiménez, Antonio ; María Blanca Sánchez ; Barrado, Patricia ; María Fernández Lobato |
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Zeitschrift: | FEBS Letters, Jg. 580 (2006-02-24), S. 1807-1811 |
Veröffentlichung: | Wiley, 2006 |
Medientyp: | unknown |
ISSN: | 0014-5793 (print) |
DOI: | 10.1016/j.febslet.2006.02.037 |
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