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| Content Provider | Springer Nature Link |
|---|---|
| Author | Purcarea, Cristina Hervé, Guy Cunin, Raymond Evans, David R. |
| Copyright Year | 2001 |
| Abstract | Pyrococcus abyssi, a hyperthermophilic archaeon found in the vicinity of deep-sea hydrothermal vents, grows optimally at temperatures around 100°C. Carbamoyl phosphate synthetase (CPSase) from this organism was cloned and sequenced. The active 34-kDa recombinant protein was overexpressed in Escherichia coli when the host cells were cotransformed with a plasmid encoding tRNA synthetases for low-frequency Escherichia coli codons. Sequence homology suggests that the tertiary structure of P. abyssi CPSase, resembling its counterpart in Pyrococcus furiosus, is closely related to the catabolic carbamate kinases and is very different from the larger mesophilic CPSases. P. furiosus CPSase and carbamate kinase form carbamoyl phosphate by phosphorylating carbamate produced spontaneously in solution from ammonia and bicarbonate. In contrast, P. abyssi CPSase has intrinsic bicarbonate-dependent ATPase activity, suggesting that the enzyme can catalyze the phosphorylation of the isosteric substrates carbamate and bicarbonate. |
| Starting Page | 229 |
| Ending Page | 239 |
| Page Count | 11 |
| File Format | |
| ISSN | 14310651 |
| Journal | Extremophiles |
| Volume Number | 5 |
| Issue Number | 4 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 2001-07-04 |
| Publisher Place | Tokyo |
| Access Restriction | One Nation One Subscription (ONOS) |
| Content Type | Text |
| Resource Type | Article |
| Subject | Medicine Molecular Medicine Microbiology |
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