3β-Hydroxysteroid-Dehydrogenase
| {{#if: 3β-Hydroxysteroid-Dehydrogenase | 3β-Hydroxysteroid-Dehydrogenase | 3β-Hydroxysteroid-Dehydrogenase }} | |||||||||||||
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| Strukturmodell in <ref name="Welzel" /> | |||||||||||||
| Andere Namen |
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Vorhandene Strukturdaten: }} | |||||||||||||
| Eigenschaften des menschlichen Proteins
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| Masse/Länge Primärstruktur | 371 / 372 / 369 Aminosäuren
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| Sekundär- bis Quartärstruktur | single-pass Membranprotein (ER, Mit.)
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| Kofaktor |
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| Präkursor |
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| Isoformen | NP_000853, NP_000189, NP_079469
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| Bezeichner | |||||||||||||
| {{#if:{{#if: |HSD3B2|HSD3B2}}, {{#if: |HSD3B7|HSD3B7}} | Gen-Namen | Gen-Name}} | Gen-Name(n) }} | {{#if: | {{#if: |[https://www.genenames.org/data/gene-symbol-report/#!/hgnc_id/HGNC: HSD3B1|HSD3B1}}] | {{#if: |HSD3B1|HSD3B1}}}}{{#if:{{#if: |HSD3B2|HSD3B2}}, {{#if: |HSD3B7|HSD3B7}} |, {{#if: |HSD3B2|HSD3B2}}, {{#if: |HSD3B7|HSD3B7}}}} }} | ||||||||||||
| Externe IDs |
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0 | }} | - = – | valid|1|2=/^[1-9]%d?%d?%d?%d?%d?%d?%d?%d?$/ | 0 | Wikipedia:Vorlagenfehler/Vorlage:PubChem}} | template= Vorlage:PubChem | format=
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| ATC-Code |
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| DrugBank | [2]
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| Wirkstoffklasse |
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| Transporter-Klassifikation | |||||||||||||
| TCDB | [3]
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| Bezeichnung |
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| EC, Kategorie | {{#if:5.3.3.1|5.3.3.1}}{{#if:Isomerase|, Isomerase}}
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| Peptidase-Familie | [4] |}} | ||||||||||||
| Reaktionsart | Umlagerung | ||||||||||||
| Substrat | Pregn-5-en-3,20-dion | ||||||||||||
| Produkte | Progesteron | | {{#if:|Inhibitorklassifikation|{{#if:|- | EC, Kategorie | {{#if:5.3.3.1|5.3.3.1}}{{#if:Isomerase|, Isomerase}}
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| Peptidase-Familie | [5] |}} | ||||||||||||
| Reaktionsart | Umlagerung | ||||||||||||
| Substrat | Pregn-5-en-3,20-dion | ||||||||||||
| Produkte | Progesteron|Enzymklassifikationen|Enzymklassifikation}}}} | ||||||||||||
| EC, Kategorie | {{#if:1.1.1.145| 1.1.1.145}}{{#if: Oxidoreduktase|, Oxidoreduktase}} }} | ||||||||||||
| MEROPS | [6]}} | ||||||||||||
| MEROPS | [7]}} | ||||||||||||
| Reaktionsart | Dehydrierung
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| Substrat | Pregnenolon + NAD+
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| Produkte | Pregn-5-en-3,20-dion + NADH/H+
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| EC, Kategorie | {{#if:5.3.3.1|5.3.3.1}}{{#if:Isomerase|, Isomerase}}
{{#if: | | ||||||||||||
| Peptidase-Familie | [8] |}} | ||||||||||||
| Reaktionsart | Umlagerung | ||||||||||||
| Substrat | Pregn-5-en-3,20-dion | ||||||||||||
| Produkte | Progesteron
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| Vorkommen | |||||||||||||
| {{#if: | [ {{#if: | Hovergen}}] | [http://hogenom.univ-lyon1.fr/query_sequence?seq= {{#if: | Hovergen}}]}} }} }} | |||||||||
| mehrzellige Tiere, Protozoen<ref>Homologe bei inParanoid</ref> }} | |||||||||||||
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3β-Hydroxysteroid-Dehydrogenasen (3β-HSD) sind Enzyme, die in Steroiden die 3β-Hydroxygruppe zum Keton oxidieren und gleichzeitig die Umlagerung der Doppelbindung von der 5- in die 4-Position katalysieren. Diese Reaktion wird in Wirbeltieren bei der Biosynthese von Progesteron aus Pregnenolon benötigt, genauso wie bei der Umwandlung von Dehydroepiandrosteron zu Androstendion oder von 17α-Hydroxypregnenolon zu 17α-Hydroxyprogesteron.
3β-HSD sind Transmembranproteine und lokalisieren zum endoplasmatischen Retikulum und zu den Mitochondrien. Beim Menschen sind drei paraloge Isoformen bekannt, die in unterschiedlichen Gewebetypen exprimiert werden: 3β-HSD I hauptsächlich in den Brustdrüsen, der Plazenta und der Haut; 3β-HSD II vor allem in Nebennieren, Hoden und Eierstöcken. Mutationen im HSD3B2-Gen sind verantwortlich für ein adrenogenitales Syndrom Typ 2 (CAH durch 3-beta-Hydroxysteroid-Dehydrogenase-Mangel).<ref>{{#if: | | UniProt }} {{#if:|{{{titel}}}|P26439}}{{#if:|Vorlage:Abrufdatum}}, {{#if: | | UniProt }} {{#if:|{{{titel}}}|P14060}}{{#if:|Vorlage:Abrufdatum}}</ref><ref name="Welzel">{{#invoke:Vorlage:Literatur|f}}{{#if:
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}}</ref> Das dritte menschliche Enzym dieser Proteinfamilie ist 3β-HSD Typ 7, ein Enzym der Gallensäurebildung aus Cholesterin.<ref name="simard">{{#invoke:Vorlage:Literatur|f}}{{#if:
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Katalysierte Reaktionen
Pregnenolon + NAD+ ⇔⇔ Progesteron + NADH/H+
Pregnenolon wird zu Progesteron umgesetzt. Es findet nacheinander eine Dehydrierung zum Keton und eine Umlagerung der Doppelbindung statt. Eine weitere Reaktion ist die Umsetzung von DHEA zu Androstendion.<ref>{{#invoke:Vorlage:Literatur|f}}{{#if:
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Strukturverweis
Strukturmodell von HSD3B1: siehe vierter Weblink<ref name="thomas">{{#invoke:Vorlage:Literatur|f}}{{#if:
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Weblinks
|1|= – Lern- und Lehrmaterialien |0|-= |X|x={{#switch: 0
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- Jassal / reactome: Pregnenolone is dehydrogenated to form pregn-5-ene-3,20-dione
- Jassal / reactome: Pregn-5-ene-3,20-dione isomerizes to progesterone
- Jassal / reactome: DHA isomerizes to 4-Androstene3,17-dione
- Strukturverweis
Einzelnachweise
<references />