Proliferating cell nuclear antigen/cyclin in the ciliate Euplotes eurystomus: localization in the replication band and in micronuclei.

The Journal of Cell Biology
D E OlinsE M Tan

Abstract

Human autoimmune sera specific for proliferating cell nuclear antigen (PCNA)/cyclin (auxiliary protein for DNA polymerase delta) demonstrated the presence of epitopes within the macro- and micronuclei of the hypotrichous ciliated protozoa Euplotes eurystomus. Tightly bound PCNA/cyclin was localized at the site of DNA synthesis in macronuclei, the rear zone of the replication band. Starvation or heat shock, conditions that reduce macronuclear replication, resulted in a decrease of PCNA/cyclin in replication bands. Micronuclei also exhibited PCNA/cyclin localization which persisted for a large proportion of the vegetative cell cycle and exhibited significant resistance to adverse culture conditions. Immunoprecipitation of 35S-labeled soluble Euplotes proteins with PCNA/cyclin autoimmune sera revealed a spectrum of low molecular mass proteins. PCNA/cyclin-like proteins have now been observed in the widely divergent species: human, rat, amphibian, yeast, and ciliated protozoa.

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Citations

Jul 1, 1991·Chromosoma·L J HauserD E Olins
Dec 1, 1993·Chromosoma·A L OlinsD E Olins
Dec 29, 1998·The Journal of Eukaryotic Microbiology·D M Prescott
Nov 18, 2003·Clinical and Experimental Immunology·E M Tan, F-D Shi
Aug 1, 1995·Hepatology : Official Journal of the American Association for the Study of Liver Diseases·P S LeungM E Gershwin
Jul 13, 2016·Genes & Development·Carol W Greider
Oct 31, 2020·Current Biology : CB·Nicholas A T IrwinWilliam A Bourland
Jun 1, 1994·Microbiological Reviews·D M Prescott

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