BIOCHM E3 C10 FINAL
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anaerobic process-doesn’t need O2
T OR F?
Glycolysis (anaerobic process-doesn’t need O2) occurs
in almost every living cell (cytoplasm).
PYRUVATE PROCESSED WITH AND WITHOUT O2 YIELDS WHAT?
RESULTS IN two three-carbon pyruvate units.
- ---->[ ]
- GLUCOSE IS A 6 SIDED MOLECULE...BROKEN DOWN INTO (2) 3 CARBON UNITS.
Activated when cells need energy-inhibited when plenty of ATP (A FEEDBACK MECHANISM)
Process that captures some energy as
2 ATP and 2 NADH
WHAT IS THIS?
- Adenosine monophosphate
JUST ADD TO THE PHOSPHATE TO GET DI, TRI.
WHAT IS THIS?
WHAT IS THIS?
- Nicotinamide Adenine Dinucleotide (NAD)
- A CO-ENZYME.
- NADP+ NOTIC OH(PO23) ON BOTTOM.
WHY DOES ATP GIVE E IF IT TAKES E TO BREAK ITS BONDS?
E PRODUCTS ARE GREATER THAT WHAT IS PUT IN.
ID IRREVERSIBLE AND REVERSIBLE
STAGE 1 OF GLYCOLTIC PATHWAY
E INVEST OR PRODUCING?
INVESTMENT WITH ATP---> ADP
T OR F ?
PHOSPLORATION PREVENTS GLUCOSE FROM LEAVING THE CELL.
GLYCOLYTIC PATHWAY FORMULA.
- D-Glucose + 2 ADP + 2 Pi + 2 NAD+ --->
- 2 pyruvate + 2 ATP + 2 NADH + 2 H+ + 2 H2O
THE PYRUVATE FROM THE GLYCOLYTIC PATHWAY GOES TO WHAT?
TCA (KREBS) CYCLE
International Union of Biochemistry (IUB) instituted a naming convention for enzymes, based upon WHAT?
the type of chemical reaction catalyzed.
Six major enzyme categories
- Oxidoreductases ---ox/red
- Transferases---transfer structural group
- Hydrolases—break down via hydrolysis
- Lyases---groups removed to form a double bond or added to a double bond.
- Isomerases---Intramolecular rearrangement
- Ligases---Join groups/structures together
groups are removed by
elimination to form a double bond or added to a double bond..WHAT ENZYME?
EXAMPLE OF Transferases
T OR F?
Phosphorylation of glucose (kinase) prevents transport out of the cell and increases reactivity
WHAT IS THE FIRST Reaction of the Glycolytic Pathway?
- Synthesis of glucose-6-phosphate
- -Hexokinase Mg+2 cofactor....ATP -->ADP
- -Phosphorylation of glucose (kinase) prevents transport out of the cell and increases reactivity
WHAT IS THE 2ND Reaction of the Glycolytic Pathway?
- Conversion of glucose-6-phosphate
- to fructose-6-phosphate.
- -Conversion of aldose to ketose
WHAT IS THE 3RD Reaction of the Glycolytic Pathway?
- Phosphorylation of fructose-6-phosphate
- - irreversible due to a large decrease in free energy (large DELTA G) commits the molecule to glycolysis.
WHAT IS THE 4TH Reaction of the Glycolytic Pathway?
- Cleavage of fructose-1,6-bisphosphate.
- -Triose Phosphate Isomerase
- -Aldol cleavage giving an aldose and ketose product—get both
WHAT IS THE 5TH Reaction of the Glycolytic Pathway?
- Interconversion of glyceraldehyde-3-phosphate and dihydroxyacetone phosphate
- -Conversion of ketose to aldose enables all carbons to continue through glycolysis (get to use both haves of glucose’s six carbons)
WHAT IS THE 6TH Reaction of the Glycolytic Pathway?
FROM THIS POINT ON, EVERYTHING IS DOUBLED. THIS IS STEP 2.
- Oxidation of glyceraldehyde-3-phosphate
- -Creates high-energy phosphoanhydride bond for ATP formation in the next step and NADH for future use.
- -Glyceraldehyde-3-phosphate dehydrogenase
WHAT IS THE 7TH Reaction of the Glycolytic Pathway?
- Phosphoryl group transfer
- -Production of ATP-taking a phosphate group off of glycerate-1-3 bisphosphate
- -Phosphoglycerate Kinase
WHAT IS THE 8TH Reaction of the Glycolytic Pathway?
- Interconversion of
- 3-phosphoglycerate and
- 2-phosphoglycerate (ISOMERATION)
- -First step in formation of phosphoenolpyruvate (PEP)
- -Phosphoglycerate Mutase
WHAT IS THE 9TH Reaction of the Glycolytic Pathway?
- Dehydration of 2-phosphoglycerate
- - Production of PEP— lyases (Join groups/structures)
- - Enolase
WHAT IS THE 10TH Reaction of the Glycolytic Pathway?
- Synthesis of pyruvate
- -Formation of pyruvate and ATP
- -Produces a net of 2 ATP, 2 NADH, and
- 2 pyruvate
- - Pyruvate Kinase
END PRODUCTS OF THE Glycolytic Pathway
- 4 ATP, BUT YOU USE 2....FINAL PRODUCT 2 ATP
- 2 NADH,
- 2 pyruvate
Under --------- conditions, pyruvate is converted to ------ for use in the citric acid cycle and electron transport chain.
IF NOT O2, PYRUVATE ENDS UP AS WHAT?
- CH3CH2 OH
IF NOT O2, BUT NADH, PYRUVATE ENDS UP AS WHAT?
- LACTATE ACID VIA HOMOLATIC FERMENTATION.
- - Regenerates NAD+ so glycolysis can continue..GET SOME ATP.
The rate of the glycolytic pathway is controlled by three
enzymes (reactions irreversible): 3 NAME THEM AND 2 HORMONES.
- Pyruvate kinase
- The hormones are glucagon and insulin
PFK-1 and pyruvate kinase ACTIVATE WHEN?
HIGH AMP CONCENTRATIONS
Glucose-6-phosphate inhibits ---------- and ATP inhibits all 3 enzymes.
Usually occurs when glycogen is depleted in liver (exercise or fasting or starving)
the formation of new glucose molecules from precursors in the liver
WHAT Requires 4 ATP and 2 GTP (Guanosine triphosphate)?
THIS PROCESSES Precursors include: lactate, pyruvate, glycerol, alanine and a-keto acids.
T OR F ?
Gluconeogenesis Reactions ARE THE Reverse of glycolysis except the three irreversible reactions
WHAT IS THIS? WHERE DO YOU SEE IT?
- STEP 2 RXN 6
ATE VS IC
- ATE: PROTENATED
- IC: DEPROTENATED
WHERE DOES GLYCOLYSIS OCCUR?
Gluconeogenesis OCCURS WHERE?
THE BRAIN AND RBC MAIN ENERGY SOURCE
Three bypass reactions OF Gluconeogenesis.
1. Synthesis of phosphoenolpyruvate (PEP) via the enzymes pyruvate carboxylase and PEP carboxykinase. NEAR BOTTOM
2. Conversion of fructose-1,6-bisphosphate to fructose-6-phosphate via the enzyme fructose-1,6-bisphosphatase. 3RD FROM TOP.
3. Formation of glucose from glucose-6-phosphate via the liver and kidney-specific enzyme glucose-6-phosphatase. NEXT TO SECOND STEP.
DEFINE CORI CYCLE
WHEN LACTATE IS RELEASED FROM SKELETAL MUSCLE
Three of the most important substrates
for gluconeogenesis are:
After transfer to the liver ------- is converted to------- then to --------.
After transfer to the liver lactate is converted to pyruvate then to glucose
a product of fat metabolism
- BREAKDOWN OF LIPIDS
generated from pyruvate in exercising muscle
—muscle broken down to provide energy
------ is converted to pyruvate then
glucose in the liver
THE GLUCOSE ALANINE CYCLE IS PART OF WHAT PROCESS?
WHAT IS IT?
THE GLUCOSE ALANINE CYCLE
Pentose Phosphate Pathway...PRODUCTS
- NO ATP is generated
- Products are NADPH and ribose-5-phosphate.
NAME THE 2 PHASES OF THE PENTOSE PHOSPHATE PATHWAY
oxidative and nonoxidative
NAME THE 2 PRODUCTS OF THE Pentose
Phosphate Pathway: Oxidative
ribulose-5-phosphate and two NADPH
- NADPH is a reducing agent used in
- anabolic (BUILD UP) processes-lipid biosynthesis
NAME THE 2 PRODUCTS OF THE PentosePhosphate Pathway: NON-Oxidative
- Produces important intermediates for nucleotide
- biosynthesis and glycolysis
If the cell requires more NADPH than
ribose molecules, products of the nonoxidative phase can be shuttled into glycolysis.
Pentose Phosphate Pathway
WHEN YOU LOSE A H+ WHAT IS IT CALLED?
Most common sugars found in oligosaccharides besides glucose
- Fructose and mannose are also important sugars for
Fructose Can enter the glycolytic pathway in two ways
- -Through the liver (multi-enzymatic process)
- -Muscle and adipose tissue (hexokinase)
- ADIPOSE: body fat or fat depot or just fat is loose connective tissue
Second to glucose in the human diet
---------- Synthesis of glycogen, the storage
form of glucose, occurs ------------
- occurs after a meal
IN WHAT PHASE OF THE PENTOSE PHOSPHATE PATHWAY IS RIBOSE MADE AND WHAT IS IT USED FOR?
Ribose-5-phosphate IS AT THE TOP OF THE PATHWAY. IT CAN GO EITHER WAY, BUT NONOXIDATIVE PHASE Ribose-5-phosphate PRODUCED IS USED FOR BIOSYNTHESIS.
------ & ---------- are also important sugars for
Fructose and mannose
GLYCOGEN IS A BIG POLYMER OF WHAT
GLYCOGENESIS 3 STEPS
1. Synthesis of glucose-1-phosphate (G1P) from glucose-6-phosphate by phosphoglucomutase
2. Synthesis of UDP-glucose from G1P by UDP-glucose phosphorylase
- §Synthesis of Glycogen from
- UDP-glucose requires two enzymes:Glycogen synthase (LENGTH) & glucosyl transferase (BRANCHES)
NAME THE 2 GLOCOSDIC LINKAGES INVOLED IN GLYCOGENESIS.
- ALPHA 1,4 (LENGTH)
- ALPHA 1,6 (BRANCHES)
- Branching enzyme Amylo-a(1,4à1,6)-glucosyl transferase creates a(1,6) linkages for branches
Glycogen degradation requires two reactions
- 1. Removal of glucose from nonreducing ends (glycogen phosphorylase) within four glucose of a branch point (off alpha1-6 side chains) and along the main chain.
- 2.Hydrolysis and transfer to nonreducing end and breaking a(1,6) glycosidic bonds at branch points by amylo-a(1,6)-glucosidase (debranching enzyme)
WHAT IS THE REDUCING AND NONREDUCING ENDS OF GLYCOGEN CHAIN?
- THE 1ST CARBON REDUCING
- 4TH CARBON NON REDUCING.
IN GLYCOGENESIS, WHAT ENZYME IS NEEDED TO CONSTRUCT THE BRANCHES?
WHAT # OF UNITS IS INVOLEVED WITH GLYCOGEN PHOSPHORYLASE.
WHAT ENZYME IS RESPONSIBLE FOR THIS?
WHEN BREAKING DOWN GLYCOGEN, WHAT 2 ITEMS ARE NEEDED TO BREAK DOWN THE CHAIN? (NOT BRANCHES)
Amylo-a(1,6)-glucosidase AND H20 (HYDROLYSIS)
AS A RESULT FROM BREAKING DOWN GLYCOGEN, NAME TWO PLACES PRODUCTS GOTO.
Regulation of Glycogen Metabolism WHAT DOES IT INVOLVE?
Regulation involves insulin, glucagon, epinephrine, and allosteric effectors
Glucagon activates --------------
MADE IN LIVER
Glucagon activates glycogenolysis
Insulin inhibits ----------- and activates ------------.
OPPOSITE OF EPINEPHRINE.
Epinephrine release activates ----------- and inhibits ---------------.
OPPOSITE OF INSULIN.
- activates glycogenolysis
- inhibits glycogenesis
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