Three-Dimensional folding of the secondary alpha-helical structure
Tertiary structure of Beta globin
subunit of hemoglobin.
The alpha helix is shown coiled inside a tubular structure; the helix
may bend at proline corners
The structure is held together by -S-S-
disulfide bridges between non-djacent cysteine
residues, and by electrostatic bonds. [The globin molecule happens to include an
inorganic iron-containing heme group,
which is not part of
the tertiary structure of most
Figure © 2004 by Griffiths
et al. ; All
material ©2010 by Steven M.