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| Content Provider | Springer Nature Link |
|---|---|
| Author | Rizzello, Antonia Ciardiello, M. Antonietta Acier, Raffaele Carratore, Vito Verri, Tizia di Prisco, Guido Storelli, Carlo Maffia, Michele |
| Copyright Year | 2007 |
| Abstract | Gill cytoplasmic carbonic anhydrase of the haemoglobinless Antarctic icefish Chionodraco hamatus (Ice-CA) was directly sequenced and consists in 259 residues with an acetylated N-terminus. The molecular mass, deduced from the sequence, was 28.45 kDa, while mass spectrometry analysis of the native protein gave higher values. Treatment with dithiothreitol abolished this difference, indicating possible post-translational modifications. Isoelectric focusing analysis of Ice-CA suggested S-thiolation, which was identified as S-glutathionylation by immunostaining. Deglutathionylated Ice-CA maintained the anhydrase activity but showed higher susceptibility to hydrogen peroxide, suggesting that glutathione binding to Cys residues may have a role in the defence against oxidative damage. Ice-CA is characterized by lower thermal stability, higher activity and lower activation energy than its homologue gill CA of the temperate European eel, confirming the adaptation of the catalytic capacity to low temperatures. Alignment of Ice-CA with homologous enzymes from other fish shows high identity; the enzyme is grouped with a previously described fish CA monophyletic clade although Ice-CA shows several characteristics that can increase protein-solvent interaction and structural flexibility. |
| Starting Page | 335 |
| Ending Page | 348 |
| Page Count | 14 |
| File Format | |
| ISSN | 15723887 |
| Journal | The Protein Journal |
| Volume Number | 26 |
| Issue Number | 5 |
| e-ISSN | 15734943 |
| Language | English |
| Publisher | Kluwer Academic Publishers-Plenum Publishers |
| Publisher Date | 2007-05-18 |
| Publisher Place | New York |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Gill carbonic anhydrase Antarctic fish haemoglobinless Chionodraco hamatus amino acid sequence S-glutathionylation Animal Anatomy / Morphology / Histology Organic Chemistry Biochemistry Bioorganic Chemistry |
| Content Type | Text |
| Resource Type | Article |
| Subject | Organic Chemistry Analytical Chemistry Biochemistry Bioengineering |
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