lesson 7c: proteins proteins: 15:56: b086-248c1b1a3f8e&blnfromsearch=1&productcode=us
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Lesson 7c: Proteins
Proteins: 15:56: http://player.discoveryeducation.com/index.cfm?guidAssetId=3C298D27-1A03-4CDD-B086-248C1B1A3F8E&blnFromSearch=1&productcode=US
collagen (skin)
Proteins Examples
muscle skin, hair, fingernails, claws
collagen, keratin
pepsin digestive enzyme
in stomach
insulin hormone that controls blood
sugar levels
insulin
pepsin
Proteins Function:
many, many functions hormones
signals from one body system to anotherinsulin
movementmuscle
immune systemprotect against germs
enzymeshelp chemical reactions
Proteins
Building block =
aminoacid
aminoacid–
aminoacid–
aminoacid–
aminoacid–
—N—H
H
H|
—C—|
C—OH
||O
variable group
amino acids
20 different amino acidsThere’s
20 of us…like 20 different
letters in analphabet!
Can make lots of different
words
Amino acid chains Proteins
amino acids chained into a polymer
Each amino acid is different some “like” water & dissolve in it
some “fear” water & separate from it
amino acid amino acid amino acid amino acid amino acid
Water-fearing amino acids Hydrophobic (phobia – fear)
“water fearing” amino acids try to get away from water in cell – but HOW?
the protein folds
Water-loving amino acids Hydrophillic (phil – love)
“water loving” amino acids try to stay in water in cell
the protein folds
pepsin
3-D protein structure Proteins fold & twist into 3-D shape
that’s what happens in the cell!
Different shapes = different jobs
collagen
hemoglobingrowth
hormone
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