Fibrous Proteins Flashcards

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1
Q

What are fibrous proteins?

A

-long stands of polypeptide chains - have cross linkages due to H bonds
-no tertiary structure
-limited no.of amino acids - highly repetitive sequence

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2
Q

Examples of fibrous proteins

A

-keratin
-elastin
-collagen

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3
Q

What is collagen?

A

-most common structural protein found in vertebrates
-provides structural support
-forms tendons, cartilage, skin and the walls of blood vessels

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4
Q

What is the structure of collagen?

A

-formed from 3 polypeptides chains held together by H bonds = triple helix
-each chain is a helix shape - contains amino acids
-PS = every 3rd amino acid is glycine

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5
Q

What are the functions of collagen?

A

-flexible structural protein
-forming connective tissues
-lots of H bonds = great tensile strength
-stable protein
-length of collagen molecule = too long to dissolve in water (insoluble)

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6
Q

What is keratin?

A

-found in hair + fingernails
-strong and soluble in water
-high proportion of cysteine = strong

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7
Q

What is elastin?

A

-skin, walls of arteries
-long cross linked strands - containing hydrophobic regions
-when stretched - spring back together

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