47.2 MB (47.0 MB compressed)
4591 x 3591 pixels
38.9 x 30.5 cm ⏐ 15.3 x 12.0 in (300dpi)
LAGUNA DESIGN / SCIENCE PHOTO LIBRARY LAGUNA DESIGN / SCIENCE PHOTO LIBRARY
Yeast enzyme. Molecular model of an enzyme from Saccharomyces cerevisiae (Baker's yeast). This enzyme is 20S proteasome. A proteasome is a complex type of proteinase (protein-digesting enzyme). The helical ribbons, arrows and sheets show the secondary structure (the shape of the enzyme). The barrel-shaped structure consists of four ring layers (here seen side on), forming a central space down the middle (running left to right) where the catalytic protein breakdown takes place. Each ring layer consists of 7 proteasome sub-units.
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