期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1981
卷号：78
期号：7
页码：4466-4470
DOI：10.1073/pnas.78.7.4466
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The mode of expression in Saccharomyces cerevisiae of the bacterial antibiotic resistance gene coding for beta-lactamase (EC 3.5.2.6 ) is described. Yeast transformants, containing hybrid plasmid pMP78-1 consisting of pBR325 in a 2-micrometers DNA vector, synthesize an active beta-lactamase protein. The enzyme was purified about 100-fold over crude extracts. With regard to activity, molecular weight, and binding to specific antibodies the yeast beta-lactamase was indistinguishable from the purified enzyme from Escherichia coli. Because the bacterial enzyme is synthesized as a preprotein with subsequent maturation, the results suggest that S. cerevisiae is able to convert the preprotein to the mature beta-lactamase. This was confirmed by in vitro experiments showing that the bacterial preprotein can be processed by crude extracts of S. cerevisiae.
