Mutant alleles for hypoxanthine phosphoribosyltransferase: Codominant expression, complementation, and segregation in hybrid Chinese hamster cells View Full Text


Ontology type: schema:ScholarlyArticle     


Article Info

DATE

1976-09

AUTHORS

L. A. Chasin, G. Urlaub

ABSTRACT

Chinese hamster ovary cell mutants resistant to the purine analogs 6-thioguanine or 8-azaguanine have been isolated following mutagenesis with ethyl methane sulfonate. The activities of hypoxanthine phosphoribosyltransferase (HPRT) in three such mutants have been found to exhibit an increased Km for the substrate 5-phosphoribosyl-1-pyrophosphate. The isoelectric point of the mutant enzyme activity has also changed in two mutants. Hybrid cells containing one mutant and one wild-type allele express both genes. Segregants that have lost only the wild-type allele can be selected on the basis of drug resistance. Two mutants exhibiting different alterations in HPRT activity can complement in a hybrid cell to yield a wild-type growth pattern and enzyme activity with intermediate electrophoretic and kinetic properties. The results suggest intracistronic complementation between structural gene mutants of HPRT. More... »

PAGES

453-467

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf01542725

DOI

http://dx.doi.org/10.1007/bf01542725

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1053584880

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/1027153


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