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BSI- Lecture 3
BSI- Lecture 3
61
Science
Graduate
08/20/2013

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Term
The 6 functions of the protein
Definition
Structural, regulatory, contractile, immunological, transport, and catalytic
Term
Form structural framework
Definition
Structural protein function
Term
alters cell function (hormones, neurotransmitters, receptors)
Definition
Regulatory
Term
Allows shortening of muscle cells
Definition
contractile
Term
aid responses that protect body again foreign substances and invading pathogens
Definition
immunological
Term
carry vital substances throughout body
Definition
transport
Term
enzymes that regulate biochemical reactions
Definition
catalytic
Term
______ interact with other molecules (ligands) to carry out its function
Definition
proteins
Term
_____ must fit precisely into binding site
Definition
ligands
Term
many bonds between the ligand and the side chains of the proteins in binding site need to be formed to ______
Definition
hold ligand in place
Term
individual bonds are ____
Definition
weak
Term
gives a protein its unique function
Definition
conformational shape
Term
determines types and location of binding sites
Definition
shape
Term
Types of bonds holding ligand
Definition
Non-covalent bonds (H bonds, ionic bonds, van der waals attraction, hydrophobic interactions)
Term
If change conformational shape of protein then....
Definition
the characteristics of binding site may change
Term
If the characteristics of the binding site change then the....
Definition
ligand will not fit in site or not enough bonds will be made to hold ligand in place.
Term
denaturation causes change of conformational shape due to ______
Definition
altered environment
Term
Altered environment could be cause of the following:
Definition
Temperature, pH, or electrolyte concentration change
Term
denaturation disrupts the _____ bonds maintaining secondary, tertiary, and quaternary structure
Definition
non-covalent
Term
all proteins have a _____ lifetime within the cell
Definition
finite
Term
Proteins are degraded because of: (list)
Definition
Normal turnover or renewal, mechanism of cellular control, cellular adaptation, damaged, misfolded
Term
Mechanism of cellular control: give the i.e.
Definition
cell cycle proteins
Term
Cellular adaptions: give the i.e.
Definition
muscle atrophy when stop exercising
Term
short lived vs. long lived proteins is an example of:
Definition
normal turnover or renewel
Term
in the ubiquitin-proteasome system the protein is tagged with ____
Definition
ubiquitin
Term
recognize specific degradation signals on proteins, then adds a chain of ubiquitin
Definition
ubiquitin ligases
Term
recognizes tag and degrades the protein
Definition
proteasome
Term
structure of proteasome
Definition
20s cylinder and 19s caps (2)
Term
contains proteases
Definition
20s cylinder
Term
recognizes ubiquittin on the protein as tag for destruction and unfolds protein and feeds it into the chamber
Definition
19s caps
Term
tag means:
Definition
chain of ubiquitin
Term
enzymes act as a
Definition
catalyst
Term
catalysts _____ the activation energy
Definition
lowers
Term
lowers the activation energy means:
Definition
the amount of energy required for a reaction to take place
Term
to convert the substrate into a ____ state is based on the amount of energy required for a reaction to take place.
Definition
transition
Term
catalyst convert substrate into product by:
Definition
making or breaking covalent bonds
Term
catalysts ______ up the rate of a reaction that would normally be too slow
Definition
speeds
Term
Catalyst increases rate by ______
Definition
million fold
Term
enzymes have at least ____ binding sites
Definition
two
Term
is where the substrate bind
Definition
a catalytic site
Term
where other molecules can bind to allosterically regulate the activity of the catalytic site
Definition
regulatory site
Term
The two binding sites for enzymes
Definition
Catalytic site and Regulatory site
Term
hydrolytic cleavage reaction
Definition
hydrolases
Term
break down nucleic acids
Definition
nucleases
Term
break down proteins
Definition
proteases
Term
synthesize molecules in anabolic reaction
Definition
syntheses
Term
rearrange bonds within a single molecule
Definition
isomerases
Term
polymerization reactions
Definition
polymerases
Term
add phosphate groups to molecules
Definition
kinases
Term
remove phosphate groups from molecules
Definition
phosphatases
Term
catalyze reactions in which one molecule is oxidized and the other reduced
Definition
oxido-reductases
Term
hydrolyze ATP
Definition
ATPases
Term
catalyzes condensation reactions in which two atoms are joined using ATP or GTP
Definition
Ligases
Term
remove pairs of hydrogen atoms
Definition
dehydrogenases
Term
small molecule that functions as a transient carrier of a functional group
Definition
coenzyme
Term
Pyruvate + NADH+ H(+) ---> Lactate + NAD(+) is an example of...
Definition
coenzyme
Term
inorganic ion or molecule that is required for enzyme activity
Definition
Cofactor
Term
cytochrome oxidase required Fe(+2), Cu(+2) is an example of ....
Definition
example of a cofactor
Term
glutathione peroxidase requires Se is an example of
Definition
example of a cofactor
Term
One the proteasome is degraded, liberated amino acids can be used for:
Definition
gluconeogenesis or protein synthesis
Term
when a catalyst lowers the activation energy it:
Definition
brings substrates in close proximity, and holds substrate in a conformation that makes it easier to convert to product
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