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Cyclus ex [[pyruvatum|pyruvato]] et, non exigue, [[aqua]] generat duo substantias, electrona ''e<sup>-</sup>'' in proximum iter portantes: [[Nicotinamidum adeninum dinucleotidum|NADH]]+H<sup>+</sup> et FAD(2H).
Cyclus ex [[pyruvatum|pyruvato]] et, non exigue, [[aqua]] generat duo substantias, electrona ''e<sup>-</sup>'' in proximum iter portantes: [[Nicotinamidum adeninum dinucleotidum|NADH]]+H<sup>+</sup> et FAD(2H).


Hic cyclus anno [[1937]] ab [[Iohannes Adolphus Krebs|Iohanne Adolpho Krebs]] primo descriptus est; nimirum Krebs anno 1953 [[praemium Nobelianum physiologiae et medicinae]] addictum est<ref>[http://nobelprize.org/nobel_prizes/medicine/laureates/1953/index.html De Iohanne Adolpho Krebs] in situ praemio Nobeliano medicinae dicato {{Ling|Anglice}}</ref>. Hac de causa cyclus non raro "cyclus Krebs" apellatur. Praeterea nomen "cycli acidorum triclyclicorum" de tribus acidis tricyclicis intra cyclum Krebs (citrato, aconitato, isocitrato) partibus cursus cycli sumitur; denique nomen "cycli acidi citrici" de [[molecula]] [[acidum citricum|acidi citrici]], non electrice onerati, derivatur, quamquam ''citratum'' forma [[ion|electrice onerata]] partem cycli ipsius capit.
Hic cyclus anno [[1937]] ab [[Iohannes Adolphus Krebs|Iohanne Adolpho Krebs]] primo descriptus est; nimirum Krebs anno 1953 [[praemium Nobelianum physiologiae et medicinae]] addictum est<ref>[http://nobelprize.org/nobel_prizes/medicine/laureates/1953/index.html De Iohanne Adolpho Krebs] in situ praemio Nobeliano medicinae dicato {{Ling|Anglice}}</ref>. Hac de causa cyclus non raro "cyclus Krebs" appellatur. Praeterea nomen "cycli acidorum triclyclicorum" de tribus acidis tricyclicis intra cyclum Krebs (citrato, aconitato, isocitrato) partibus cursus cycli sumitur; denique nomen "cycli acidi citrici" de [[molecula]] [[acidum citricum|acidi citrici]], non electrice onerati, derivatur, quamquam ''citratum'' forma [[ion|electrice onerata]] partem cycli ipsius capit.


== Cursus ==
== Cursus ==

Emendatio ex 14:17, 11 Februarii 2020

Cursus cycli acidi citrici

Cyclus acidi citrici vel cylcus acidorum triclyclicorum vel cyclus Krebs est iter metabolicum intracellulare et iter paenultimum in mitochondriis, ante phosphorylationem oxydativam enim, energiam cellularem (ATP) generantem.

Cyclus ex pyruvato et, non exigue, aqua generat duo substantias, electrona e- in proximum iter portantes: NADH+H+ et FAD(2H).

Hic cyclus anno 1937 ab Iohanne Adolpho Krebs primo descriptus est; nimirum Krebs anno 1953 praemium Nobelianum physiologiae et medicinae addictum est[1]. Hac de causa cyclus non raro "cyclus Krebs" appellatur. Praeterea nomen "cycli acidorum triclyclicorum" de tribus acidis tricyclicis intra cyclum Krebs (citrato, aconitato, isocitrato) partibus cursus cycli sumitur; denique nomen "cycli acidi citrici" de molecula acidi citrici, non electrice onerati, derivatur, quamquam citratum forma electrice onerata partem cycli ipsius capit.

Cursus

Aequatio generalis cycli Krebs:

Acetylo-CoA + 3 NAD+ + FAD + GDP + Pi+ 2 H2O → CoA + 3 NADH + 3 H+ + FAD(2H) + GTP + 2 CO2

Nota cycli Krebs ope, nec oxygenium consumatur, nec ATP generatur, sed generantur GTP et CO2. Oxygenium quidem, ut ATP, demum in itinere proximo, phosphorylatione oxydativa, momenta maxima habebit.

Condiciones

Gradus cycli acidi citrici

  • Reactio biochemica 0/10 (Citrati synthasis): Oxaloacetatum + Acetylo-CoA + H2O → Citratum + CoA-SH
  • Reactio biochemica 1 (Aconitasis): Citratum + CoA-SH → cis-Aconitatum + H2O
  • Reactio biochemica 2 (Aconitasis): cis-Aconitatum + H2O → Isocitratum
  • Reactio biochemica 3 (Isocitrati dehydrogenasis): Isocitratum + NAD+ → Oxalosuccinatum + NADH + H+
  • Reactio biochemica 4 (Isocitrati dehydrogenasis): Oxalosuccinatum → α-Ketoglutaratum + CO2
  • Reactio biochemica 5 (α-Ketoglutarate dehydrogenasis): α-Ketoglutaratum + NAD+ + CoA-SH → Succinylo-CoA + NADH + H+ + CO2
  • Reactio biochemica 6 (Succinylo-CoA synthetasis): Succinylo-CoA + GDP + Pi → Succinatum + CoA-SH + GTP
  • Reactio biochemica 7 (Succinati dehydrogenasis): Succinatum + Ubiquinonum (Q) → Fumaratum + Ubiquilonum (QH2)
  • Reactio biochemica 8 (Fumarasis): Fumaratum + H2OL-Malatum
  • Reactio biochemica 9 (Malati dehydrogenasis) L-Malatum + NAD+ → Oxaloacetatum + NADH + H+
  • Reactio biochemica 10/0 (Citrati synthasis): Oxaloacetatum + Acetylo-CoA + H2O → Citratum + CoA-SH

Eventus

  • Electrona (cyclo 3 moleculae NADH+H+, 1 molecula FAD(2H))
  • GTP (cyclo 1 molecula)
  • CO2 (cyclo 2 moleculae, aeris exspirati)

Notae

  1. De Iohanne Adolpho Krebs in situ praemio Nobeliano medicinae dicato (Anglice)

Nexus interni

Nexus externi

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