The Ramachandran diagram. Allowed phi and psi torsion angles in proteins. The Ramachandran diagram of Gly residues in a polypeptide chain. Cis/Trans Isomerization: Proline. trans. cis. Energy difference between these forms is small.
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Energy difference between these forms is small.
Nearly all Xaa-Pro linkages are biosynthesized in the trans form.
~10% of these peptide bonds are in the cis form in globular proteins.
Interconversion catalyzed by peptidyl prolyl cis-trans isomerases
Stereo space-filling representation of an a helical segment of sperm whale myoglobin (its E-helix) as determined by X-ray crystal structure analysis.
Stereo space-filling representation of the 6-stranded antiparallel b pleated sheet in jack bean concanavalin A as determined by crystal X-ray analysis.
Polypeptide chain folding in proteins illustrating the right-handed twist of b sheets: chicken muscle triose phosphate isomerase. (b barrel)
crossoversConnections between adjacent polypeptide strands in b pleated sheets.
The two-stranded coiled coil: side view in which the polypeptide back bone is represented by skeletal (left) and space-filling (right) forms.
X-Ray structure of the triple helical collagen model peptide (Pro-Hyp-Gly)10 in which the fifth Gly is replaced by Ala. (a) Ball and stick representation.
X-Ray structure of the triple helical collagen model peptide (Pro-Hyp-Gly)10 in which the fifth Gly is replaced by Ala. (b) View along helix axis.
X-Ray structure of the triple helical collagen model peptide (Pro-Hyp-Gly)10 in which the fifth Gly is replaced by Ala. (c) A schematic diagram.
The 2D proton NMR structures of proteins: a NOESY spectrum of a protein presented as a contour plot with two frequency axes w1 and w2.
Representations of the X-ray structure of sperm whale myoglobin: a diagram in which the protein is represented by its computer-generated Ca backbone.
Representations of the x-ray structure of sperm whale myoglobin: a diagram in which the protein is represented by its computer-generated Ca backbone.
The H helix of sperm whale myoglobin. (a)A helical wheel representation in which the side chain positions about the a helix are projected down the helix axis onto a plane.
purple = polarThe H helix of sperm whale myoglobin: a space-filling model.
purple = polarA space-filling model of an antiparallel b sheet from concanavalin A.
X-ray structure of the C-terminal domain of bovine g-b crystallin: a topological diagram showing how its two Greek key motifs are arranged in a b barrel.
X-ray structures of open b sheet-containing enzymes: dogfish lactate dehydrogenase, N-terminal domain (residues 20-163 of this 330-residue protein).
and Analysis of Surface
PropertiesA GRASP diagram of human growth hormone (helps predict protein interactions with charged molecules)
interactionsMelting temperature of RNase A as a function of the concentration of various salts.