โ
Good Girls Feel Fine Doing Good Deeds But Prefer Passion
Picture This (Mental Hook): 10 sisters in the cytoplasm: Good Girls Feel Fine Doing Good Deeds But Prefer Passion! They invest 2 ATP coins upfront in the investment phase, then split their jewelry into 4 ATP coins in payoff!
๐ Visual Diagram & Mental Flow:
GLYCOLYSIS FLOW (Embden-Meyerhof-Parnas Pathway):
Glucose โโโบ Glucose-6-P โโโบ Fructose-6-P โโโบ Fructose-1,6-BP
โฒ โฒ
(Hexokinase) (Phosphofructokinase-1: Rate-Limiting!)
โ
(Aldolase) โโดโโโโโโโโโโโโโโโโโโโโโ
โผ โผ
DHAP โโโ(Triose-P-Iso)โโโบ GAP (G-3-P)
โ
2x 1,3-Bisphosphoglycerate
โ
2x 3-Phosphoglycerate (ATP made!)
โ
2x 2-Phosphoglycerate
โ
2x Phosphoenolpyruvate (PEP)
โ (Pyruvate Kinase)
2x PYRUVATE (Net 2 ATP + 2 NADH)๐ The Decoded Sequence:
G-G-F-F
Investment Phase
Glucose, G-6-P, F-6-P, F-1,6-BP (costs 2 ATP)
PFK-1
Committed Step
Phosphofructokinase-1 is the primary allosteric regulatory control point
D-G
Splitting
Aldolase cleaves into DHAP and Glyceraldehyde-3-phosphate
B-P-P-P
Payoff Phase
1,3-BPG, 3-PG, 2-PG, PEP, Pyruvate (yields 4 ATP + 2 NADH)
Examiner Trap / Never Forget: Arsenate uncouples glycolysis at GAPDH step! Fluoride inhibits Enolase by chelating magnesium, which is why blood sugar collection tubes use sodium fluoride!
โ
Ordinarily, Careless Crappers Are Also Frivolous About Urination
Picture This (Mental Hook): Think of the liver waste treatment plant: Ordinarily, Careless Crappers Are Also Frivolous About Urination! Ammonia toxic fumes enter the mitochondria and leave as harmless urine urea in the cytosol!
๐ Visual Diagram & Mental Flow:
MITOCHONDRIAL MATRIX: CYTOSOL:
NH3 + CO2 + 2 ATP
โ (CPS-I: Rate limiting!)
Carbamoyl Phosphate
โ (Ornithine Transcarbamoylase: OTC)
[CITRULLINE] โโโโโโโโโโโโโโโโโโโโโโบ Citrulline + Aspartate
โ (Argininosuccinate synthetase)
Argininosuccinate
โ (Argininosuccinase)
[ARGININE] + Fumarate (enters TCA!)
โ (Arginase)
[ORNITHINE] โโโโโโโโโโโโโโโโโโโโโโโ Ornithine + [UREA] (Excreted!)๐ The Decoded Sequence:
O-C-C
Ordinarily Careless Crappers
Ornithine, Carbamoyl phosphate, Citrulline (Mitochondria)
A-A-F-U
Are Also Frivolous About Urination
Argininosuccinate, Arginine, Fumarate, Urea (Cytosol)
Examiner Trap / Never Forget: N-acetylglutamate (NAG) is an essential obligate allosteric activator of CPS-I! OTC deficiency is X-linked, whereas all other urea cycle enzyme defects are autosomal recessive.
โ
Very Poor Carbohydrate And Muscle Health (V-P-C-A-M-H)
Picture This (Mental Hook): A pediatric biochemistry patient struggles with: Very Poor Carbohydrate And Muscle Health! Von Gierke's liver balloons with glucose-6-phosphatase defect, Pompe's heart enlarges with lysosomal alpha-glucosidase defect, and McArdle's muscles cramp!
๐ Visual Diagram & Mental Flow:
โโโโโโโโโโโฌโโโโโโโโโโโโโโโโโโโโโโโฌโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโฌโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ โ Type โ Name โ Deficient Enzyme โ Key Clinical Findings โ โโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโผโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโค โ Type I โ [V]on Gierke โ Glucose-6-Phosphatase โ Severe fasting hypoglycemia,โ โ โ โ โ hepatomegaly, lactic acidosisโ โ Type II โ [P]ompe โ Lysosomal alpha-1,4-glucosidaseโ Cardiomegaly, early death โ โ Type IIIโ [C]ori โ Debranching enzyme โ Limit dextrinosis, milder โ โ Type IV โ [A]ndersen โ Branching enzyme โ Cirrhosis, fatal hepato-failโ โ Type V โ [M]cArdle โ Muscle glycogen phosphorylase โ Painful cramps with exerciseโ โ Type VI โ [H]ers โ Liver glycogen phosphorylase โ Mild fasting hypoglycemia โ โโโโโโโโโโโดโโโโโโโโโโโโโโโโโโโโโโโดโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโดโโโโโโโโโโโโโโโโโโโโโโโโโโโโโโ
๐ The Decoded Sequence:
V
Von Gierke (Type I)
Glucose-6-phosphatase defect; liver cannot release free glucose into blood
P
Pompe (Type II)
Acid maltase deficiency; Pompe trashes the Pump (massive cardiomegaly)
C
Cori (Type III)
Debranching enzyme deficiency; limit dextrin accumulates
M
McArdle (Type V)
Muscle phosphorylase; muscle cramps, myoglobinuria, normal lactate rise after exercise
Examiner Trap / Never Forget: Pompe disease (Type II) is the ONLY glycogen storage disease that is also a LYSOSOMAL storage disorder!
