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| Content Provider | Springer Nature Link |
|---|---|
| Author | Zhang, Ruifu Gu, Ji Dong |
| Copyright Year | 2008 |
| Abstract | A novel cryptic plasmid, pMP1, from an environmental Vibrio vulnificus MP-4 isolated from Mai Po Nature Reserve in Hong Kong, has been characterized. The 7.6-kb plasmid had guanine–cytosine content of 40.03% and encoded four open reading frames (ORFs) with >100 amino acids. The predicted protein of ORF1 contained 478 amino acids showing 29% identity and 50% similarity over 309 amino acids to the integrase of Vibrio cholerae phage VP2. ORF2 encoded a putative protein of 596 amino acids, which were 23% identity and 42% similarity over 455 amino acids to the tail tape measure protein TP901 of Chromohalobacter salexigens phage. ORF3 and ORF4 encoded putative proteins of 103 and 287 amino acids, respectively, but showed no homologies to any known proteins. Further experiments indicated that a 3.2-kb fragment from EcoRI digestion could self-replicate. Analysis indicated that a sequence upstream of ORF4 had the features characteristic of theta-type replicons: AT-rich region, six potential direct repeats (iterons) spaced approximately two DNA helical turn apart (about 23 bp), two copies of 9 bp dnaA boxes, three Dam methylation sites, and five inverted repeats. Complementation experiments confirmed that the protein encoded by ORF4 was required for plasmid replication. We propose that ORF4 encode a new type of Rep protein and pMP1 is a new type of theta plasmid. |
| Starting Page | 456 |
| Ending Page | 462 |
| Page Count | 7 |
| File Format | |
| ISSN | 14362228 |
| Journal | Marine Biotechnology |
| Volume Number | 11 |
| Issue Number | 4 |
| e-ISSN | 14362236 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2008-11-14 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Cryptic plasmid pMP1 Vibrio vulnificus Theta replication Engineering Zoology Microbiology Freshwater & Marine Ecology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Aquatic Science Biotechnology |
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