Quantum redactiones paginae "Cyclus acidi citrici" differant

E Vicipaedia
Content deleted Content added
mNo edit summary
Linea 47: Linea 47:
{{biologia-stipula}}
{{biologia-stipula}}
[[Categoria:Itinera metabolica]]
[[Categoria:Itinera metabolica]]
[[Categoria:Cyclus acidi citrici|!]]

Emendatio ex 21:59, 1 Ianuarii 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) generandi.

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

Cyclus hic anno 1937 ab Hans Adolphum Krebs primo descriptus est; nimirum Krebs anno 1953 Praemium Nobelianum physiologiae et medicinae addictum est[1]. Hac de causa cyclus non raro "cyclus Krebs" dicitur. Praeterea, nomen "cycli acidorum triclyclicorum" de tribus acidis tricyclicis intra cyclum Krebs (citratum, aconitatum, isocitratum) partibus cursus cycli; 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, ne oxygenium consumatur, ne ATP generetur, sed generentur GTP et CO2. Oxygenium quidem, ut ATP, demum in itinere proximo, phosphorylatione oxydativa, momenta maxima habebunt.

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 Hans Adolpho Krebs in situ Praemio Nobeliano Medicinae dicato (Anglice)

Nexus interni

Nexus externi

Haec stipula ad biologiam spectat. Amplifica, si potes!