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Biochemistry Final ENZYMES
ENZYMES for Biochem Final
83
Biochemistry
Professional
12/09/2011

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Term
Transaminases(aminotransferases)
Definition
remove the amino group from one amino acid and transfer it to an alpha keto acid
Term
Glutamate Dehydrogenase
Definition
deaminates glutamate to yield alpha ketoglutarate and NH4+
Term
Carbamoyl Phosphate Synthetase I
Definition
generation of carbamoyl phosphate from basic ingredients
Term
Ornithine Transcarbamoylase
Definition
Generates citrulline from ornithine and carbamoyl phosphate
Term
Argininosuccinate Synthase
Definition
Generates argininosuccinate from aspartate and citrulline
Term
Argininosuccinate Lyase
Definition
Breaks argininosuccinate into L-Arginine and Fumarate
Term
Arginase
Definition
Converts L-arginine to urea and Ornithine
Term
Glutaminase (renal or intestinal)
Definition
Converts glutamine to glutamate
Term
Glutamine Synthase
Definition
Makes glutamine from glutamate
Term
Glutamate Dehydrogenase
Definition
Makes alpha ketoglutarate and NH3 from glutamate
Term
Pepsinogen
Definition
secreted by chief cells- activated to pepsin by HCL- cleaves proteins into smaller fragments
Term
Enteropeptidase and Aminopeptidase
Definition
Digest proteins to free amino acids
Term
Trypsin
Definition
Activates Chymotrypsin, elastase, and carboxypeptidase
Term
Endoprotease
Definition
Cleaves middle of protein
Term
Phospholipase A2
Definition
a lipase that releases fatty acids from the C2 position of membrane phospholipids
-Think Arachidonic Acid to Eicosanoid production
Term
Phospholipase C
Definition
-hydrolyzes phosphate and therefore polar head groups from glycerophospholipids
Term
Cyclooxygenase
Definition
Converts arachidonic acid into prostaglandins and thromboxanes
Term
Lipoxygenase
Definition
Converts arachidonic acid into HPETE, leukotrienes, HETE, and lipoxins
Term
Cytochrome P450
Definition
Converts arachidonic acid into epoxides diHETE and HETE
Term
Peroxidase
Definition
Requires reduced glutathione to convert PGG2 to PGH2
Term
PGI Synthase
Definition
makes prostacyclins in vascular smooth muscle
Term
TXA synthase
Definition
platelets
Term
PGD and PGE synthase
Definition
lymphocytes
Term
HMG-CoA Reductase
Definition
BIG DEAL- rate limiting step of cholesterol biosynthesis- converts HMG-CoA to Mevalonate
TARGET OF DRUG THERAPY (STATINS)
Term
Thiolase
Definition
Synthesis of acetoacetyl CoA
Term
Hydrolases
Definition
Acidic enzymes within lysosomes for hydrolysis of cholesterol esters, phospholipid, and other lipids
Term
ACAT- Acyl:cholesterol Acyltransferase
Definition
esterifies fatty acid from fatty acyl CoA to cholesterol in TISSUES
-transfers acyl from AcylCoA to cholesterol to make cholesterol ester
Term
LCAT- Lecithin: cholesterol Acyltranferase
Definition
Esterifies fatty acid from lecithin to cholesterol WITHIN HDL PARTICLES- FOUND IN BLOOD
Term
CETP- Cholesterol Ester Transfer Protein
Definition
Exchanges cholesterol ester for triglcyerides between HDL and VLDL
Term
AcetylCoA Carboxylase
Definition
Makes Malonyl CoA- RATE LIMITING STEP OF FA SYNTHESIS
REQUIRES: Biotin, ATP, and CO2
Term
Citrate Lyase
Definition
Breaks citrate back into AcetylCoA and OAA after it leaves the mitochondria
Term
Malic Enzyme
Definition
Generates NADPH by oxidative decarboxylation
Converts malate to pyruvate for shuttling back into mitochondria
Term
Fatty Acid Synthase
Definition
Uses acetyl CoA and malonyl CoA to make palmitic acid (FA)
Term
Fatty Acyl CoA Desaturase
Definition
Puts double bonds into fatty acids
Requires: O2, NADH, and cyt b5 (Fe)
Term
Glycerol Kinase
Definition
ONLY IN LIVER- converts glycerol to Glycerol-3-Phosphate
Term
Lipoprotein Lipase
Definition
Breaks TGS into FAs for transport into muscles and adipose
-Requires ApoCII on VLDL or Chylomicron for activation of LPL
Term
Hormone-sensitive Lipase
Definition
inside adipose hydrolyzes TG to form fatty acids and glycerol
-activated by low insulin levels and phosphorylation
Term
Phospholipase A1
Definition
Cleaves the 1-acyl (first long chain) of a glycerophospholipid
Term
Phospholipase D
Definition
Cleaves JUST THE HEAD GROUP from glycerophospholipids, leaving phosphatidic acid
Term
Pancreatic Lipase
Definition
Hydrolyzes ester linkages in DIETARY triacylglycerol prior to absorption
Term
Linguinal and Gastric Lipases
Definition
Hydrolyze TGs (preferentially short and medium chain)
Term
Colipase
Definition
Pancreatic- relieves bile acid inhibition of lipase
Term
Cholesterol Esterase
Definition
Converts cholesterol ester to cholesterol
Term
Microsomal Triglyceride Transfer Protein (MTP)
Definition
Adds lipid to chylomicron
Term
Glucokinase
Definition
Converts Glucose to G-6-P in liver
Term
Hexokinase
Definition
Converts Glucose to G-6-P outside of the liver
Term
Phosphofructokinase (PFK)
Definition
Converts Fructose-6-P to Fructose 1,6-bis-P
Term
Pyruvate Kinase
Definition
Converts Phosphoenolpyruvate to Pyruvate
Term
Glucose-6-Phosphatase
Definition
Converts Glucose-6-Phosphate BACK to glucose
Term
Fructose Bisphosphatase
Definition
Converts Fructose 1,6-P back to Fructose-6-P
Term
Lactate Dehydrogenase
Definition
Converts pyruvate to 2 lactates
Term
Pyruvate Carboxylase
Definition
Converts Pyruvate to Oxaloacetate
-BIOTIN DEPENDENT
Term
Alanine Aminotransferase
Definition
Converts Alanine to Pyruvate
Term
Trehalase
Definition
Converts Trehalose to Glucose
Term
Sucrase
Definition
Converts Sucrose to Glucose or Fructose
Term
Fructokinase
Definition
LIVER- converts fructose to F-1-P
Term
Aldolase B
Definition
Converts Fructose-1-P into glyceraldehyde and dihydroxyacetone
Term
Alpha Amylase
Definition
Converts glycogen and starch to glucose
Term
Aldose Reductase
Definition
Alternative glucose metabolic pathway creates sorbitol
ALSO MAKES GALACTITOL FROM GALACTOSE
Term
Sorbitol Dehydrogenase
Definition
Converts sorbitol to Fructose
Term
Galactokinase
Definition
Converts galactose to Galactose 1-P
(Non-classical galactosemia)
Term
Galactose 1-P Uridylyltransferase
Definition
Converts Galactose-1-P to UDP Galactose
(Classical galactosemia)
Term
Transketolase
Definition
Major enzyme to convert 5C to 6C to reenter glycolysis after PPP
REQUIRES THIAMINE
Term
Glucose-6-Phosphate Dehydrogenase
Definition
Returns G-6-P to PPP, but also catalyzes GLUTATHIONE REDUCTASE ANTIOXIDANT ACTIVITY
-can be G-6-PD deficient= hemolytic anemia
Term
Cystathionine Synthase
Definition
Converts Homocysteine and Serine into Cystathionine
-Deficient in primary homocysteinuria
Term
Phenylalanine Hydroxylase (PAH)
Definition
Converts phenylalanine to tyrosine
-if deficient, phenylketonuria
Term
Homogentisate Oxidase
Definition
Converts homogentisate to Fumarate and Acetoacetate
-deficient in Alcaptonuria
Term
Phosphoglucomutase
Definition
Converts G-6-P to G-1-P
Term
Uridyl Transferase (UDP-Glucose Pyrophophorylase)
Definition
Converts G-1-P to UDP-Glucose
Term
Glycogen Synthase
Definition
Elongates glycogen by one sugar
Term
Branching Enzyme
Definition
Adds branches to glycogen stem
Term
Glycogen Phosphorylase
Definition
Breaks down glycogen
Term
Debranching Enzyme
Definition
Removes 3 units from glycogen
Term
Salivary Amylase
Definition
Begins carb digestion in mouth
Term
Glucoamylase Complex
Definition
Cleaves Alpha 1,4 linkages in small intestine
DEGRADES MALTOSE AND MALTOTRIOSE
Term
Sucrase-Isomaltase Complex
Definition
Degrades sucrose and maltose
(Alpha 1,6 bonds)
Term
Beta Glycosidase
Definition
Breaks down LACTOSE
***LACTOSE INTOLERANCE***
Term
UDP-NAcGlc Phosphotransferase
Definition
Converts O-Mannose to O-Mannose-6-P-1-NAcGlc
DEFECTIVE IN I CELL DISEASE
Term
Hexosaminidase
Definition
Digests GalNaC
Defective in Tay Sachs
Term
Alcohol Dehydrogenase (ADH)
Definition
Converts ethanol to Acetaldehyde
Term
Acetaldehyde Dehydrogenase (ALDH)
Definition
Converts Acetaldehyde to Acetate
Term
Acetyl CoA Synthetase
Definition
Converts Acetate to AcetylCoA
Term
MEOS
Definition
Converts ethanol to acetaldehyde using CYP2E1 (cytochrome P450)
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