honors biology - enzymes
TRANSCRIPT
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Enzymes:
“Helper” Protein molecules
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Flow of energy through life Life is built on chemical reactions
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Chemical reactions of life Processes of life
building molecules synthesis
breaking down molecules digestion
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Nothing works without enzymes! How important are enzymes?
all chemical reactions in living organisms require enzymes to work building molecules
synthesis enzymes
breaking down molecules digestive enzymes
enzymes speed up reactions “catalysts”
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enzyme
enzymeWe can’t live
without enzymes!
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Examples synthesis
digestion
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enzyme
enzyme
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A THREE SLIDE INTERMISSION
These relate to your “Guided Reading Notes”
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Endergonic vs. exergonic reactionsexergonic endergonic- energy released- digestion
- energy invested- synthesis
- break down molecules - build molecules
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Reducing Activation energy Catalysts
reducing the amount of energy to start a reaction
Pheeew…that takes a lot
less energy!
reactant
product
uncatalyzed reaction
catalyzed reaction
NEW activation energy
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Catalysts So what’s a cell got to do to reduce
activation energy? get help! … chemical help… ENZYMES
Call in the ENZYMES!
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AND WE ARE BACK…
The next slide is #6
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Enzymes are proteins Each enzyme is the specific helper to
a specific reaction each enzyme needs to be the right shape
for the job enzymes are named for the reaction
they help sucrase breaks down sucrose proteases breakdown proteins lipases breakdown lipids DNA polymerase builds DNA
Oh, I get it!They end
in -ase
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Enzymes aren’t used up Enzymes are not changed by the reaction
used only temporarily re-used again for the same reaction with
other molecules very little enzyme needed to help in many
reactions
enzyme
substrate product
active site
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It’s shape that matters! Lock & Key model
shape of protein allows enzyme & substrate to fit
specific enzyme for each specific reaction
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Enzyme vocabulary Enzyme
helper protein molecule Substrate
molecule that enzymes work on Products
what the enzyme helps produce from the reaction
Active site part of enzyme
that substrate molecule fits into
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What affects enzyme action Correct protein structure
correct order of amino acids why? enzyme has to be right shape
Temperature why? enzyme has to be right shape
pH (acids & bases) why? enzyme has to be right shape
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Order of amino acids Wrong order = wrong shape = can’t do its job!
DNA
DNA
chain ofamino acids
chain ofamino acids
foldedprotein
foldedprotein
right shape!
wrong shape!
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Temperature Effect on rates of enzyme activity
Optimum temperature greatest number of collisions between
enzyme & substrate human enzymes
35°- 40°C (body temp = 37°C) Raise temperature (boiling)
denature protein = unfold = lose shape Lower temperature T°
molecules move slower fewer collisions between enzyme &
substrate
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37°
Temperature
temperature
reac
tio
n r
ate
What’s happening here?!
humanenzymes
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pH Effect on rates of enzyme activity
changes in pH changes protein shape most human enzymes = pH 6-8
depends on where in body pepsin (stomach) = pH 3 trypsin (small intestines) = pH 8
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7
pH
pH
reac
tio
n r
ate
20 1 3 4 5 6 8 9 10
stomachpepsin
intestinestrypsin
What’s happening here?!
11 12 13 14
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For enzymes…What matters?
SHAPE!