Amino Acids

(Lodish et al., 2000, Section 3.1 )

Four levels of structure

Primary Fig. 3.4a
Secondary Fig. 3.4b

alpha-helix Fig. 3.6, held together with H-bonds

amphipathic Fig. 3.7, Fig. 3.9a, attractions of hydrophobic faces

beta-sheet Fig. 3.8

anti-parallel Fig. 3.8
parallel

loops Fig. 3.9 b, unstructures regions that connect sheets and helices

turns

glycine
proline

coils Fig. 3.8c random coils are loose helical structures

Tertiary Fig. 3.4b
Quaternary Fig. 3.4c

Prosthetic groups - small molecules
bound to proteins (zinc, iron common) Fig. 3.9c

Activity

Quiz

References:
Lodish, H., Berk, A., Zipursky, S.L., Matsudaira, P., Baltimore, D., Darnell, J., 2000, Molecular Cell Biology, 4th Ed., W.H. Freeman and Company, NY, New York. ISBN 0-7167-3136-3.