Transcript Proteins - Magrin Science

Regents Biology
Proteins:
_________________________
Regents Biology
2006-2007
Proteins
Examples


______________________
______________________
 collagen, keratin

insulin
pepsin
______________________
 digestive enzyme
in stomach

______________________
 hormone that controls blood
sugar levels
Regents Biology
collagen (skin)
Proteins
 Function:

many, many functions
 ________________________
 signals from one body system to another
 insulin
 ________________________
 muscle
 ________________________
 protect against germs
 ________________________
 help chemical reactions
Regents Biology
Proteins
 Building block = __________________
amino amino amino amino amino
acid – acid – acid – acid – acid

________________________
H O
H
| ||
—N—
—C—C—OH
|
H variable
Regents Biology
group
There’s
20 of us…
like 20 different
letters in an
alphabet!
Can make lots of
different
words
Amino acid chains
 Proteins

amino acids chained into a polymer
amino acid
amino acid
amino acid
amino acid
amino acid
 Each amino acid is different

__________________________________

__________________________________
Regents Biology
Water-fearing amino acids
 Hydrophobic
__________________________________
 try to get away from water in cell

 the protein folds
Regents Biology
Water-loving amino acids
 Hydrophillic
__________________________________
 try to stay in water in cell

 the protein folds
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For proteins: SHAPE matters!
 ___________________________________

that’s what happens in the cell!
 ___________________________________
growth
hormone
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hemoglobin
pepsin
collagen
It’s SHAPE that matters!
 __________________________________
__________________________________
 Unfolding a protein destroys its shape
wrong shape = _____________________
 unfolding proteins = ________________

 temperature
 pH (acidity) folded
In Biology,
it’s not the size,
it’s the SHAPE
that matters!
Regents Biology
unfolded
“denatured”
Let’s eat some
Proteins!
Regents Biology
2006-2007