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Structural hierarchy - Primary, secondary, tertiary, quaternary.
Amino acids
Peptide bond
Genetic code = primary structure
Psi and phi bonds = secondary structure - Ramachandran plot
Helices vs beta ribbon (beta ribbon vs beta sheet)
Helix designation - 310, p, a
Tertiary structure - may have both helix and beta, covalent (-S-S-), H-bond, hydrophobicity, etc.
Structure vs action
Fibrous proteins - keratins, collagens, silks.
Globular proteins
Configuration changes = work, e.g., activation
Quaternary structure:

1 protein - 1 function
1 protein - several functions (active sites)
multiple proteins - several functions (holoenzymes)
homo/hetero-dimers, trimer, quatermeres, etc.
Complement = configuration change = action.

Motifs: (repeated, copied, predicted, homology)

Helices and beta ribbons allow certain predictability.
Proline and glycine = bends
Helix-loop-helix
Zinc finger
Leucine zipper

Homology and evolution

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