Pyranosone dehydratase from the basidiomycete Phanerochaete chrysosporium: improved purification, and identification of 6-deoxy-D-glucosone and D-xylosone reaction products
Jazyk angličtina Země Německo Médium print
Typ dokumentu časopisecké články, práce podpořená grantem
PubMed
8352649
DOI
10.1007/bf00258142
Knihovny.cz E-zdroje
- MeSH
- Basidiomycota enzymologie MeSH
- chelátory farmakologie MeSH
- chromatografie iontoměničová MeSH
- dehydratasy biosyntéza chemie izolace a purifikace metabolismus MeSH
- deoxyglukosa analogy a deriváty biosyntéza metabolismus MeSH
- elektroforéza v polyakrylamidovém gelu MeSH
- isoelektrická fokusace MeSH
- karbohydrátdehydrogenasy biosyntéza MeSH
- ketosy biosyntéza metabolismus MeSH
- koncentrace vodíkových iontů MeSH
- stabilita enzymů MeSH
- substrátová specifita MeSH
- vysoká teplota MeSH
- Publikační typ
- časopisecké články MeSH
- práce podpořená grantem MeSH
- Názvy látek
- 6-deoxyglucosone MeSH Prohlížeč
- chelátory MeSH
- dehydratasy MeSH
- deoxyglukosa MeSH
- karbohydrátdehydrogenasy MeSH
- ketosy MeSH
- pyranose oxidase MeSH Prohlížeč
- pyranosone dehydratase MeSH Prohlížeč
- threo-pentos-2-ulose MeSH Prohlížeč
Pyranose oxidase and pyranosone dehydratase (aldos-2-ulose dehydratase), enzymes which convert in coupled reactions D-glucose to beta-pyrone cortalcerone, peaked coincidently during idiophasic growth of Phanerochaete chrysosporium under agitated conditions. The enzymes were purified from mycelial extracts of the fungus and separated from each other by hydrophobic interaction chromatography on Phenyl-Sepharose and Phenyl-Superose. Two pyranosone dehydratase activity peaks, PD I and PD II, were resolved. The major PD I fraction, consisting about 74% of the total dehydratase activity, was further purified by anion exchange chromatography on Mono Q to yield apparently pure enzyme as judged by SDS-PAGE and gel filtration on Superose 12. Isoelectric focusing indicated microheterogeneity of the protein by the presence of at least five protein bands with pI 5.1-5.3. PD II had a pI of 5.75. Overall PD I purification was 60.7-fold with 50% yield. The enzyme acted on several osones (glycosuloses), with the preferred substrate being D-glucosone. D-Xylosone and 6-deoxy-D-glucosone were dehydrated at C-3-C-4 to give the corresponding 5-hydroxy-2,3-dioxoalcanals (4-deoxy-2,3-glycosdiuloses), new enzymatically produced sugar derivatives. The latter labile compounds were trapped as diphenylhydrazine or o-phenylenediamine derivatives and spectroscopically identified. The analogous D-glucosone dehydration product did not accumulate due to its further transformation. pH optimum of PD I activity was 6.0 and its pH stability was optimal at pH 7-11. The enzyme was sensitive to Me2+ chelating agents and some heavy metal ions (Hg2+, Cu2+).
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Compounds isolated at the Institute of Microbiology in 1989-2001 and future trends
