Intermediate Tyrosyl Radical and Amyloid Structure in Peroxide-Activated Cytoglobin.
We characterized the peroxidase mechanism of recombinant rat brain cytoglobin (Cygb) challenged by hydrogen peroxide, tert-butylhydroperoxide and by cumene hydroperoxide. The peroxidase mechanism of Cygb is similar to that of myoglobin. Cygb challenged by hydrogen peroxide is converted to a Fe4+ oxo...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Public Library of Science (PLoS)
2015-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC4552303?pdf=render |
| _version_ | 1819030798075953152 |
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| author | Juliana C Ferreira Marcelo F Marcondes Marcelo Y Icimoto Thyago H S Cardoso Aryane Tofanello Felipe S Pessoto Erica G A Miranda Tatiana Prieto Otaciro R Nascimento Vitor Oliveira Iseli L Nantes |
| author_facet | Juliana C Ferreira Marcelo F Marcondes Marcelo Y Icimoto Thyago H S Cardoso Aryane Tofanello Felipe S Pessoto Erica G A Miranda Tatiana Prieto Otaciro R Nascimento Vitor Oliveira Iseli L Nantes |
| author_sort | Juliana C Ferreira |
| collection | DOAJ |
| description | We characterized the peroxidase mechanism of recombinant rat brain cytoglobin (Cygb) challenged by hydrogen peroxide, tert-butylhydroperoxide and by cumene hydroperoxide. The peroxidase mechanism of Cygb is similar to that of myoglobin. Cygb challenged by hydrogen peroxide is converted to a Fe4+ oxoferryl π cation, which is converted to Fe4+ oxoferryl and tyrosyl radical detected by direct continuous wave-electron paramagnetic resonance and by 3,5-dibromo-4-nitrosobenzene sulfonate spin trapping. When organic peroxides are used as substrates at initial reaction times, and given an excess of peroxide present, the EPR signals of the corresponding peroxyl radicals precede those of the direct tyrosyl radical. This result is consistent with the use of peroxide as a reducing agent for the recycling of Cygb high-valence species. Furthermore, we found that the Cygb oxidation by peroxides leads to the formation of amyloid fibrils. This result suggests that Cygb possibly participates in the development of degenerative diseases; our findings also support the possible biological role of Cygb related to peroxidase activity. |
| first_indexed | 2024-12-21T06:35:52Z |
| format | Article |
| id | doaj.art-5154f7fc995648f3a4cd7147f91d4a87 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-21T06:35:52Z |
| publishDate | 2015-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-5154f7fc995648f3a4cd7147f91d4a872022-12-21T19:12:52ZengPublic Library of Science (PLoS)PLoS ONE1932-62032015-01-01108e013655410.1371/journal.pone.0136554Intermediate Tyrosyl Radical and Amyloid Structure in Peroxide-Activated Cytoglobin.Juliana C FerreiraMarcelo F MarcondesMarcelo Y IcimotoThyago H S CardosoAryane TofanelloFelipe S PessotoErica G A MirandaTatiana PrietoOtaciro R NascimentoVitor OliveiraIseli L NantesWe characterized the peroxidase mechanism of recombinant rat brain cytoglobin (Cygb) challenged by hydrogen peroxide, tert-butylhydroperoxide and by cumene hydroperoxide. The peroxidase mechanism of Cygb is similar to that of myoglobin. Cygb challenged by hydrogen peroxide is converted to a Fe4+ oxoferryl π cation, which is converted to Fe4+ oxoferryl and tyrosyl radical detected by direct continuous wave-electron paramagnetic resonance and by 3,5-dibromo-4-nitrosobenzene sulfonate spin trapping. When organic peroxides are used as substrates at initial reaction times, and given an excess of peroxide present, the EPR signals of the corresponding peroxyl radicals precede those of the direct tyrosyl radical. This result is consistent with the use of peroxide as a reducing agent for the recycling of Cygb high-valence species. Furthermore, we found that the Cygb oxidation by peroxides leads to the formation of amyloid fibrils. This result suggests that Cygb possibly participates in the development of degenerative diseases; our findings also support the possible biological role of Cygb related to peroxidase activity.http://europepmc.org/articles/PMC4552303?pdf=render |
| spellingShingle | Juliana C Ferreira Marcelo F Marcondes Marcelo Y Icimoto Thyago H S Cardoso Aryane Tofanello Felipe S Pessoto Erica G A Miranda Tatiana Prieto Otaciro R Nascimento Vitor Oliveira Iseli L Nantes Intermediate Tyrosyl Radical and Amyloid Structure in Peroxide-Activated Cytoglobin. PLoS ONE |
| title | Intermediate Tyrosyl Radical and Amyloid Structure in Peroxide-Activated Cytoglobin. |
| title_full | Intermediate Tyrosyl Radical and Amyloid Structure in Peroxide-Activated Cytoglobin. |
| title_fullStr | Intermediate Tyrosyl Radical and Amyloid Structure in Peroxide-Activated Cytoglobin. |
| title_full_unstemmed | Intermediate Tyrosyl Radical and Amyloid Structure in Peroxide-Activated Cytoglobin. |
| title_short | Intermediate Tyrosyl Radical and Amyloid Structure in Peroxide-Activated Cytoglobin. |
| title_sort | intermediate tyrosyl radical and amyloid structure in peroxide activated cytoglobin |
| url | http://europepmc.org/articles/PMC4552303?pdf=render |
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