Glutathiontransferase Omega
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| Eigenschaften des menschlichen Proteins
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| Masse/Länge Primärstruktur | 241/243 Aminosäuren
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| Sekundär- bis Quartärstruktur | Homodimer
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| {{#if:{{#if: 23064 |GSTO2|GSTO2}} | Gen-Namen | Gen-Name}} | Gen-Name(n) }} | {{#if: | {{#if: 13312 |[https://www.genenames.org/data/gene-symbol-report/#!/hgnc_id/HGNC:13312 GSTO1|GSTO1}}] | {{#if: 13312 |GSTO1|GSTO1}}}}{{#if:{{#if: 23064 |GSTO2|GSTO2}} |, {{#if: 23064 |GSTO2|GSTO2}}}} }} | ||||||||||||
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| DrugBank | [2]
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| TCDB | [3]
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| EC, Kategorie | {{#if:2.5.1.18| 2.5.1.18}}{{#if: Transferase|, Transferase}} }} | ||||||||||||
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| {{#if: | [ {{#if: | Hovergen}}] | [http://hogenom.univ-lyon1.fr/query_sequence?seq=P78417 {{#if: | Hovergen}}]}} }} }} | |||||||||
| Säugetiere, Insekten, Würmer }} | |||||||||||||
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Glutathiontransferasen Omega (GSTO) sind Enzyme in Säugetieren, Insekten und Würmern, die Dehydroascorbinsäure und Monomethylarsenat mithilfe von Glutathion reduzieren können. Sie spielen daher eine wichtige Rolle bei der Recyclierung von Vitamin C und bei der Biotransformation von Arsenverbindungen. Im Menschen sind zwei Paraloge bekannt, die von den Genen GSTO1 und GSTO2 codiert werden. GSTO-1 kommt im Zytoplasma aller Gewebetypen vor, insbesondere aber in der Leber, den Skelettmuskeln und im Herz. GSTO-2 wird ebenso überall, aber besonders in den Hoden produziert.<ref>{{#if: | | UniProt }} {{#if:|{{{titel}}}|P78417}}{{#if:|Vorlage:Abrufdatum}}</ref><ref name='r'>{{#invoke:Vorlage:Literatur|f}}{{#if:
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Die GSTO gehören zu den Glutathion-S-Transferasen und sind dadurch charakterisiert, dass als katalytisches Zentrum ein Cystein-Rest agiert, sowie durch ihre Dehydroascorbat-Reduktase-Aktivität.<ref name='r' />
Weitere entdeckte Funktionen von GSTO-1 sind Modulierung des Ryanodin-Rezeptors und Interaktion mit Arzneistoffen, die die Freisetzung von Zytokinen hemmen.<ref name='r' />
Es gibt möglicherweise Varianten von GSTO-1, die mit amyotropher Lateralsklerose assoziiert sind, andere erhöhen das Risiko für Brustkrebs, weitere gehen mit zerebraler Atherosklerose einher. GSTO-1 ist ein möglicher Kandidat als Ursache für das Phänomen der Platinresistenz.<ref>{{#invoke:Vorlage:Literatur|f}}{{#if:
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Katalysierte Reaktionen
DeAsc + 2GSH <math>\longrightarrow</math> Asc + GSSG
Dehydroascorbinsäure wird zu Ascorbinsäure reduziert, während Glutathion zu Glutathiondisulfid oxidiert wird.<ref>D’Eustachio/reactome.org: Reduction of dehydroascorbate to ascorbate.</ref>
Einzelnachweise
<references />