KERATIN

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Last updated 12:09 AM on 9/25/26
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6 Terms

1
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What is the basic structure of α-keratin?

Two α-helical chains twist around each other to form a left-handed coiled-coil dimer.

2
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What is the pitch of α-keratin compared with a normal α-helix?

α-Keratin: 5.1 Å; normal α-helix: 5.4 Å.

3
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What stabilizes α-keratin?

Disulfide bonds between cysteine residues.

4
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How do hard and soft α-keratin differ?

Hard keratin has high sulfur content and is less pliable; soft keratin has low sulfur content and is more pliable.

5
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What is the assembly sequence of α-keratin?

Coiled-coil dimers → protofilaments → protofibrils → microfibrils → macrofibrils.

6
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Where is keratin found?

Epidermis, hair, nails, horns, and feathers.