NIH / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY NIH / CUSTOM MEDICAL STOCK PHOTO / SCIENCE PHOTO LIBRARY
Ribonuclease. Molecular computer graphic showing the structure of the enzyme ribonuclease. Here, the polypeptide (protein) skeleton of the molecule is represented. Coloured areas depict different sites on the molecule; chains of spherical atoms form linkages which hold the molecule in shape; at above centre (red) are rings of atoms. Ribo- nuclease is an enzyme involved in the breakdown or hydrolysis of RNA (mRNA) in the cell by breaking its phosphodiester bonds. RNA is involved in protein synthesis in all living cells. Enzymes are biological catalysts, proteins that speed up the rates of reactions within cells.
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