Analysis of HGPRT? CRM+ human lymphoblast mutants

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Analysis of HGPRT- CRM+ human lymphoblast mutants.

Three 6-thioguanine-resistant mutants of the human diploid lymphoblast line MGL-8 were studied. The inactivation by heat of both HGPRT activity and antigenicity of the HGPRT immunologically cross-reacting material of the A30 mutant cells were not protected by PRPP, indicating that the HGPRT in A30 cells has an altered PRPP binding site, leading to lack of stabilization and rapid degradation of ...

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Mutagen-induced diploid human lymphoblast variants containing altered hypoxanthine guanine phosphoribosyl transferase.

The human lymphoblast line MGL8 was treated with HAT and subsequently "mutagenized" with EMS (200 microgram/ml) to give 15% survival, and 6-thioguanine-resistant cells were selected by cloning in soft agarose containing the drug (1 microgram/ml). Eighteen sublines of independently derived resistant clones were isolated and studied in detail. One subline had a low residual HGPRT activity of abou...

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Altered properties of human T-lymphoblast soluble low Km 5'-nucleotidase: comparison with B-lymphoblast enzyme.

Soluble low Km 5'-nucleotidases have been purified from human cultured T- and B-lymphoblasts to compare their properties and to examine the mechanism of different rates of nucleotide dephosphorylation. The enzyme from B-lymphoblasts (MGL-8) was 4385-fold purified with a specific activity of 114 mumol/min/mg, while the enzyme from T-lymphoblasts (CEM, MOLT-4) was 4355-fold purified with a specif...

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Gene Products of Crm -- Mutants at the Td Locus.

I Edelen, D. G. B., "On the foundations of relativistic energy mechanics," Nuovo Cimento, 30, 292 (1963). 2 Einstein, A., "Hamiltonsches princip und allgemeine relativititstheorie," Sitzber. Pruessischen Akad. Wis&. (1916). 3 Thomas, T. Y., "On the geodesic hypothesis in the theory of gravitation," these PROCEEDINGS, 48, 1567 (1962). 4Taub, A. H., "General relativistic variational principle for...

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ژورنال

عنوان ژورنال: Somatic Cell Genetics

سال: 1979

ISSN: 0098-0366,1572-9931

DOI: 10.1007/bf01542643