Mutations at serine 37 in mouse guanylate kinase confer resistance to 6-thioguanine

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Mutations at serine 37 in mouse guanylate kinase confer resistance to 6-thioguanine.

Guanylate kinase (GMK) is an essential nucleoside monophosphate kinase that catalyzes the phosphorylation of guanine-monophosphate (GMP) and dGMP to yield GDP and dGDP, respectively, important precursors for nucleotide synthesis. GMK is also responsible for the activation of 6-thioguanine (6-TG), a drug widely used as chemotherapeutic agent to treat leukemia. Several mechanisms of resistance to...

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Use of nucleosides in resistance to 6-thioguanine.

Ascites cell tumors were found to cleave thioguanine riboside relatively rapidly. In tumor cell lines lacking the ribonucleotide pyrophosphorylase necessary for formation of thioguanine ribonucleotide, thioguanine riboside was converted to nucleotide to a small extent. This nucleotide formation was enhanced, after a short time lag, by 9-methyl thioguanine. The nucleoside, adenine arabinoside, w...

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Guanylate kinase is an essential and conserved enzyme in nucleotide biosynthetic pathway that transfers phosphoryl group of ATP to GMP for yielding GDP. Here, we report the phosphorylation of guanylate kinase from Mycobacterium tuberculosis (mGmk) by eukaryotic-type Ser/Thr kinase, PknA. Mass spectrometric studies identified Thr101 and Thr169 as phosphorylatable residues in mGmk. To evaluate th...

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ژورنال

عنوان ژورنال: Protein Engineering Design and Selection

سال: 2009

ISSN: 1741-0126,1741-0134

DOI: 10.1093/protein/gzn078