Biochemistry I   Spring & Fall Terms

Molecular Mass Scales

  Display these Molecules:
  1. H2O & 2. Glucose
  3. "Alphabet Helix"
  4. Protein G
  5. Myoglobin
  6. Hemoglobin
  7. Immunoglobulin G
  8. 70S Ribosome Protein & RNA

  Add these molecules to any display:
  1. H2O & 2. Glucose
  3. Alphabet Helix
  4. Protein G
  5. Myoglobin
  6. Hemoglobin
  7. Immunoglobulin G
  8. 70S Ribosome Protein & RNA

  Remove labels.

  Background Color:
  White   Blue   Black

Structures Selected to show the Scale of Molecular Masses
The initial image is a thick Backbone display of Myoglobin with the heme group shown as Spacefill, colored CPK. The Mr (kDa) and a characteristic distance (Å) are also shown.
The "Display these Molecules" buttons above show the molecules listed and the next smallest structure. The latter is shown as a thin Backbone (or as Sticks). Thus, when the Myoglobin button is hit, a thin version of Protein G will be superimposed on the prominent Myoglobin model.
The "Add these Molecules. . ." buttons will display any model on the list superimposed on the current pair in the image.
Additional notes:
1. The "Alphabet Helix" is a theoretical 20-residue peptide with one each of the amino acids, colored Amino.
2. Protein G is colored Structure. Structure (and Chain) coloring is disabled for the other models.
3. The coordinate files for Myoglobin and the other larger structures contain only the a-carbons. Thus, Backbone and Spacefill are the only display choices possible.
4. The dimensions shown for the ribosome are from the center to two edges. A sphere of ~250 Å would enclose most of the structure.
5. The following bar graph shows the Mr (Da) of the eight structures on a logarithmic scale.

Back to the Protein Structure List.

smBack Return to Home Page Fall 2004 -or- Home Page Spring 2004.


8.21.04