sir hans adolf krebs sheffield university united kingdom fritz albert lipmann harvard medical school...
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Sir Hans Adolf KrebsSheffield UniversityUnited Kingdom
Fritz Albert LipmannHarvard Medical School
Boston, MA, USA
The Nobel Prize in Physiology or Medicine 1953
"for his discovery of the citric acid cycle”1937
"for his discovery of co-enzyme A and its importance for intermediary metabolism"
At the University of Freiburg (1932), Krebs discovered (with the German biochemist Kurt Henseleit) a series of chemical reactions (now known as the urea cycle) by which ammonia is converted to urea in mammalian tissue;
Ciclo di Krebs o Ciclo degli acidi tricarbiossilici o Ciclo del citrato
Via metabolica finale di
- glucosio- acidi grassi
- amminoacidi
ANAEROBIOSI
GLUCOSIO
AEROBIOSI
GLUCOSIO 2 PIRUVATO 2 ACETIL-CoA
2 ATP
2 NADH 5 ATP
2 NADH 5 ATP
2 ATP
3 NADH + H+
1 FADH2
1 GTP
2 x
2 x
7,5 ATP1,5 ATP1 ATP
20 ATP
10 ATP TOT 32 ATP
2 LATTATO
aspartato -BIOSINTESI LIPIDI-acidi grassi- colesterolo
glutammato
fenilalaninatirosina
ValIle
MetAc grassi a catena dispari
BIOSINTESI EME - porfirina
BIOSINTESI GLUCOSIO
BIOSINTESI ECATABOLISMO AMMINOACIDI
BIOSINTESI UREA
piruvato principale via di entrata CO2
metab. extra epatico corpi chetonici
Controllo: rapporto mitocondriale NAD+/NADH e stato energetico della cellula 3 deidrogenasi inibite da alti livelli NADH e bassi livelli di NAD+
acetil-CoA
Inibita da NADHInibita da succinil-CoA
ossalacetato
malato (deidrogenasi)
succinil-CoA
-chetoglutarato (deidrogenasi)
isocitrato(deidrogenasi)
Inibita da NADHAttivata da ADP
Inibita dA NADH