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Transcript 
PROTEIN PHYSICS
LECTURE 7
Main secondary structures
H-bonds
Helices:
Right and Left
Mirror-asymmetric amino acids –
mirror-asymmetric (“chiral”) helices
Right -helix
Right
-helix
Right -helix
Right 310 helix
ALA, etc.
GLY only
,
twisted
,
twisted
Mirror-asymmetric
amino acids –
mirror-asymmetric
twist of -sheets
-hairpin with turn
turn I
turn I’
turn II
-bulge
collagen triple helix
Experimental
study of
secondary
structure
X-ray
crystallography
NMR
spectroscopy
(cross-peaks)
Experimental study of secondary structure
Far UV CD spectra
(peptide groups)
IR spectra
(amid I, C=O bond)
Globular
Membrane
Fibrous
H-bonds & hydrophobics
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