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- Sirohydrochlorin_ferrochelatase abstract "In enzymology, a sirohydrochlorin ferrochelatase (EC 4.99.1.4) is an enzyme that catalyzes the chemical reactionsirohydrochlorin + Fe2+ siroheme + 2H+Thus, the two substrates of this enzyme are sirohydrochlorin and Fe2+, whereas its two products are sirohaem and H+.This enzyme belongs to the family of lyases, to be specific the "catch-all" class of lyases that do not fit into any other sub-class. The systematic name of this enzyme class is siroheme ferro-lyase (sirohydrochlorin-forming). The enzyme is also known as SirB and present in all plants and nitrate and sulfate assimilating/dissimilating bacteria. Siroheme is a co-factor of both assimilatory and dissimilatory nitrite and sulfite reductases. Siroheme is synthesized from the central tetrapyrrole molecule uroporphyrinogen III, which forms the first branch-point of tetrapyrrole biosynthetic pathway, the other branch being the heme/chlorophyll branch. The siroheme branch consists of three steps, methylation, dehydrogenation and ferrochelation, with the last step carried out by sirohydrochlorin ferrochelatase.Sirohydrochlorin ferrochelatase is a class II chelatase i.e. it does not require ATP for its activity unlike class I chelatases such as Mg-chelatase. In E. coli, all three steps of siroheme biosynthesis are carried out by a single multifunctional enzyme called CysG, while in yeast Saccharomyces cerevisiae the last two steps are carried out by a bifunctional enzyme called Met8p. CysG and Met8p share common folds but are unrelated to SirB and constitute the so-called class III chelatase. SirB belongs to CbiX family protein and the plant SirB is half the length of bacterial SirB and aligns with its N- and C-terminal halves suggesting that the longer form evolved from the gene duplication and fusion of the shorter form.Sirohydrochlorin ferrochelatase from all land plants and certain green algae but not bacteria or other algae consists of an iron sulfur cluster, which can switch between [2Fe-2S] and [4Fe-4S] forms depending on the redox status of the cellular milieu. Although it is not clearly determined what role this switching of the cluster might play, it is postulated to be involved in a critical redox regulation of siroheme biosynthesis.".
- Sirohydrochlorin_ferrochelatase ecNumber "4.99.1.4".
- Sirohydrochlorin_ferrochelatase thumbnail Siroheme.svg?width=300.
- Sirohydrochlorin_ferrochelatase wikiPageID "14251066".
- Sirohydrochlorin_ferrochelatase wikiPageRevisionID "605478046".
- Sirohydrochlorin_ferrochelatase ecNumber "4.99".
- Sirohydrochlorin_ferrochelatase goCode "51266".
- Sirohydrochlorin_ferrochelatase hasPhotoCollection Sirohydrochlorin_ferrochelatase.
- Sirohydrochlorin_ferrochelatase iubmbEcNumber "4".
- Sirohydrochlorin_ferrochelatase name "sirohydrochlorin ferrochelatase".
- Sirohydrochlorin_ferrochelatase subject Category:EC_4.99.1.
- Sirohydrochlorin_ferrochelatase subject Category:Enzymes_of_unknown_structure.
- Sirohydrochlorin_ferrochelatase type Abstraction100002137.
- Sirohydrochlorin_ferrochelatase type Activator114723079.
- Sirohydrochlorin_ferrochelatase type Catalyst114723628.
- Sirohydrochlorin_ferrochelatase type Chemical114806838.
- Sirohydrochlorin_ferrochelatase type Compound114818238.
- Sirohydrochlorin_ferrochelatase type Enzyme114732946.
- Sirohydrochlorin_ferrochelatase type EnzymesOfUnknownStructure.
- Sirohydrochlorin_ferrochelatase type Macromolecule114944888.
- Sirohydrochlorin_ferrochelatase type Material114580897.
- Sirohydrochlorin_ferrochelatase type Matter100020827.
- Sirohydrochlorin_ferrochelatase type Molecule114682133.
- Sirohydrochlorin_ferrochelatase type OrganicCompound114727670.
- Sirohydrochlorin_ferrochelatase type Part113809207.
- Sirohydrochlorin_ferrochelatase type PhysicalEntity100001930.
- Sirohydrochlorin_ferrochelatase type Protein114728724.
- Sirohydrochlorin_ferrochelatase type Relation100031921.
- Sirohydrochlorin_ferrochelatase type Substance100019613.
- Sirohydrochlorin_ferrochelatase type Thing100002452.
- Sirohydrochlorin_ferrochelatase type Unit109465459.
- Sirohydrochlorin_ferrochelatase type Biomolecule.
- Sirohydrochlorin_ferrochelatase type Enzyme.
- Sirohydrochlorin_ferrochelatase type BiologicalObject.
- Sirohydrochlorin_ferrochelatase comment "In enzymology, a sirohydrochlorin ferrochelatase (EC 4.99.1.4) is an enzyme that catalyzes the chemical reactionsirohydrochlorin + Fe2+ siroheme + 2H+Thus, the two substrates of this enzyme are sirohydrochlorin and Fe2+, whereas its two products are sirohaem and H+.This enzyme belongs to the family of lyases, to be specific the "catch-all" class of lyases that do not fit into any other sub-class. The systematic name of this enzyme class is siroheme ferro-lyase (sirohydrochlorin-forming).".
- Sirohydrochlorin_ferrochelatase label "Sirohydrochlorin ferrochelatase".
- Sirohydrochlorin_ferrochelatase sameAs m.03cz6sf.
- Sirohydrochlorin_ferrochelatase sameAs Q7530550.
- Sirohydrochlorin_ferrochelatase sameAs Q7530550.
- Sirohydrochlorin_ferrochelatase sameAs Sirohydrochlorin_ferrochelatase.
- Sirohydrochlorin_ferrochelatase wasDerivedFrom Sirohydrochlorin_ferrochelatase?oldid=605478046.
- Sirohydrochlorin_ferrochelatase depiction Siroheme.svg.
- Sirohydrochlorin_ferrochelatase isPrimaryTopicOf Sirohydrochlorin_ferrochelatase.
- Sirohydrochlorin_ferrochelatase name "sirohydrochlorin ferrochelatase".