Metabolism Flashcards
direct energy vs indirect energy
ATP= direct
NADH and FADH2 = indirect (go to ETC to make ATP)
gluconeogenesis
anabolic
makes glucose from precursor molecules
mitocondria and cytosol
glycogenesis
anabolic
make glycogen to store glucose
cytosol
fatty acid synthesis
anabolic
makes fatty acids from acetyl CoA
cytosol
lipogenesis
anabolic
adds fatty acids to a glycerol backbone to make triglyceride lipids
cytosol
ketogenesis
anabolic
makes ketone bodies from acetyl CoA
mitochondria
pentose phosphate shunt
anabolic
shunts glucose into the creation of various 5-carbon sugars and NADPH
cytosol
glycogenolysis
catabolic
breakdown of glycogen to release glucose, glucose can then enter glycolysis to produce energy
cytosol
glycolysis
catabolic
breakdown of glucose to pyruvate to produce energy (NADH, ATP). after glycolysis, pyruvate can be converted to acetyl CoA to enter the CAC to produce more energy
cytosol
lipolysis
catabolic
breakdown of lipids (triglycerides) to release fatty acids from the glycerol backbone. the fatty acids can then enter beta oxidation to produce more energy
beta oxidation
catabolic
breakdown of fatty acyl to acetyl CoA to produce energy (NADH, FADH2). acetyl CoA can enter the CAC to produce more energy
mitochondria
ketolysis
catabolic
breakdown of ketone bodies to acetyl CoA. acetyl CoA can enter the CAC to produce more energy
mitochondria
citric acid cycle
catabolic
breakdown of citrate (made from acetyl CoA and oxaloacetate) to produce energy (NADH, FADH2, ATP)
mitochondria
glycolysis
breakdown of glucose for energy
-glucose –> 2 pyruvate (and ATP and NADH)
anaerobic: convert pyruvate into lactate to regenerate NAD+, can enter mitochondria
gluconeogenesis
-make glucose with substrates: lactate, glycerol, amino acids
-in liver; send to other tissues when blood glucose low
glycogenolysis
breakdown glycogen
-in liver: release glucose to raise low blood sugar
-in muscles: use for energy in strenuous activity
glycogenesis
store excess glucose as glycogen
-anabolic, use ATP and UTP
pentose phosphate shunt
use glucose to make:
1. NADPH- used for fatty acid synthesis, antioxidation
2. 5-C sugars- such as ribose-5-P for nucleotide synthesis
-can feed sugars back into glycolysis “shunt” if needed
beta oxidation
-breakdown of fatty acids for energy
-make indirect energy (NADH and FADH2)
-fats broken down to acetyl CoA and if want more energy enter CAC into mitochondria
fatty acid synthesis
excess glucose to acetyl CoA to fatty acids
-store as triglycerides
lipogenesis
fatty acids + glycerol to make triglycerides (storage)
lipolysis
release fatty acids from triglycerides
-fatty acids–> fatty acyl CoA –> acetyl CoA to make energy
triglycerides for energy:
-take up less space than glycogen, more carbon atoms and easier reduction
ketogenesis
liver makes ketone bodies from acetyl CoA
-these ketone bodies can be used by other tissues (i.e. cardia muscle, smooth muscle, brain) when energy is needed
ketolysis
breakdown of ketone bodies to release acetyl CoA
-acetyl CoA goes into CAC to make energy
-liver only makes ketone bodies, cant use them
which 3 catabolic pathways feed into the citric acid cycle?
3 catabolic pathways that feed into CAC to make more energy
- glycolysis… –>pyruvate
- lipolysis … –>fatty acyl CoA
- ketolysis … –>ketones
all into acetyl CoA
what are the 3 irreverislbe steps in glycolysis?
- glucose –> glucose 6-phosphate (via hexokinase)
- fructose 6-phosphate –> fructose 1,6-bisphosphate (via phosphofructokinase 1) *main switch - rate limiting/commiting step
- phosphoenolypyruvate –> pyruvate (via pyruvate kinase)