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| Content Provider | PubMed Central |
|---|---|
| Author | Makise, Masaki Mima, Shinji Motohiro, Koterasawa Tsuchiya, Tomofusa Mizushima, Tohru |
| Abstract | The DnaA protein is the initiator of chromosomal DNA replication in Escherichia coli. Acidic phospholipids decrease its affinity for adenine nucleotides, and re-activate the ADP-bound form to the ATP-bound form. We have previously reported that two mutant forms, DnaAR328E and DnaAK372E, have decreased affinity for cardiolipin (CL). In the present study, we constructed a mutant DnaA protein, DnaA435, with both R328E and K372E, and compared its biochemical characteristics with those of DnaAR328E and DnaAK372E. DnaA435 could bind to oriC DNA, but did not bind ATP or ADP. In DnaA435, compared with DnaAR328E and DnaAK372E, CL caused less inhibition of oriC DNA binding, suggesting that amino acids R328 and K372 are involved in the interaction of DnaA with acidic phospholipids. DnaA435 could initiate DNA synthesis on oriC both in vivo and in vitro. Based on these results, we propose that ATP activates DnaA protein by changing its higher order structure around R328 and K372. |
| Starting Page | 453 |
| File Format | |
| ISSN | 14708728 |
| e-ISSN | 14708728 |
| Journal | Biochemical Journal |
| Issue Number | Pt 2 |
| Volume Number | 362 |
| Language | English |
| Publisher Date | 2002-03-01 |
| Access Restriction | Open |
| Subject Keyword | Research in Higher Education |
| Content Type | Text |
| Resource Type | Article |
| Subject | Cell Biology Molecular Biology Biochemistry |
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