Whale muscles contain many myoglobin molecules (red) to store oxygen during their deep dives. This cross section shows the space between two muscle sarcomeres, which are shown at right and left with actin thin filaments in yellow and myosin thick filaments in tan. The space also includes many glycolytic enzymes and other other enzymes involved in energy production (blue) and glycogen granules (purple). A tubule of the sarcoplasmic reticulum is shown at the bottom, with many calcium pumps (blue molecules in the membrane) and calcium storage proteins (green) that concentrate calcium inside, for use in control of muscle contraction.
This painting was created as part of the celebration of the 50th anniversary of the Protein Data Bank.
This painting is part of PDB-101's SciArt gallery of Molecular Landscapes by David S. Goodsell.