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：1994
卷号：91
期号：24
页码：11462-11466
DOI：10.1073/pnas.91.24.11462
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：Endoproteinase Asp-N cleaves the 581-amino acid Escherichia coli primase (65,564 Da) into several major fragments. One of these, a 47-kDa fragment containing the complete N terminus and the first 422 amino acids of primase, is capable of primer RNA (pRNA) synthesis in the G4oric/single-stranded DNA binding protein/primase pRNA synthesis system. A cloned 398-amino acid N-terminal fragment of primase can also synthesize pRNA. The sizes of the pRNA synthesized by these N-terminal fragments, however, are smaller than those synthesized by intact primase, suggesting that the C-terminal region of primase plays a role in processivity or regulation of pRNA synthesis. Primase mutants with the last 10 and 40 C-terminal amino acids deleted synthesize pRNA as wild-type primase, indicating that any regulatory sequences must be internal to the C terminus of primase.
