Eukaryotic cells employ at least three nuclear, DNA-dependent RNA polymerase systems for the synthesis of cellular RNA. RNA polymerases I, II, and III primarily produce rRNA, mRNA, and tRNA, respectively. In a rapidly growing cell, most RNA synthesis is devoted to production of the translation machinery, with rRNA synthesis by RNA polymerase I representing more than half of total cellular transcription. The fundamental connection between ribosome biogenesis and cell growth is clear; furthermore, recent studies have identified transcription by RNA polymerase I as a key target for anticancer chemotherapy. Thus, efficient methods for characterizing transcription of the ribosomal DNA and its regulation are needed. In order to describe enzymatic features of an enzyme, in vitro assays are critical. Here we describe a method for purifying RNA polymerase I. This approach yields enzyme of sufficiently high quantity and activity for an array of experiments directed at describing the enzymatic properties of RNA polymerase I in detail.

• PMID: 25665570
• DOI full text
• PubMed

Reference Type

Journal Article | Research Support, N.I.H., Extramural

Authors

Appling FD, Schneider DA

Primary Lit For

Additional Lit For

Review For