Phys 02 12 Protein

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Phys 02 12 Protein

  1. 1. Objec&ve
2.12:
Proteins
 •  Iden&fy
the
monomers
and
polymers.
 •  Compare
and
contrast
general
molecular
structure.
 •  Provide
specific
examples.
 •  Iden&fy
dietary
sources.

 •  Discuss
physiological
and
structural
roles
in
the
human
body.

  2. 2. Proteins
 •  Proteins
give
structure
to
the
body,
regulate
 processes,
provide
protec&on,
help
muscles
to
 contract,
transport
substances,
and
serve
as
 enzymes.
 •  Contain
carbon,
hydrogen,
oxygen,
and
 nitrogen

  3. 3. Proteins
 •  Constructed
from
combina&ons
of
20
amino
 acids.
 –  dipep&des
formed
from
2
amino
acids
 joined
by
a
covalent
bond
called
a
pep&de
 bond
 –  polypep&des
chains
formed
from
10
to
2000
 amino
acids.

 •  Pep&de
=
10
–
100
amino
acids
(aa)
 •  Protein
=
100+
amino
acids

  4. 4. 4
Components
of
an
Amino
Acid
 •  Central
carbon
atom
 •  Amino
group
(NH2)
 •  Carboxyl
group
(COOH)
 •  Side
chains
(R
groups)
vary
 between
amino
acids
 •  4
classes
of
side
chains:

 –  Nonpolar
 –  Polar
 –  Acidic
 –  Basic

  5. 5. Forma&on
of
a
Dipep&de
Bond
 •  Dipep&des
formed
from
2
amino
acids
joined
by
a
covalent
 bond
called
a
pep&de
bond
 –  dehydra&on
synthesis
 •  Polypep&des
chains
contain
10
to
2000
amino
acids.

  6. 6. A
Few
Roles
of
Proteins
 •  Enzymes:
catalyze
chemical
reac&ons
 •  An&bodies:
immune
response
 •  Transporters:
move
material
into
and
out
of
a
 cell,
through
the
body
 •  Channels:
move
material
into
and
out
of
a
cell
 •  Cytoskeleton:
support
the
cell
 •  Hormones
&
Receptors:
signaling
and
 regula&on,
maintain
homeostasis


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