BO VEISLAND / SCIENCE PHOTO LIBRARY BO VEISLAND / SCIENCE PHOTO LIBRARY
Streptavidin-biotin molecular complex. Molecular model of a single-strand binding complex of streptavidin (ribbons) and biotin (space-filled model, centre). Biotin is also known as vitamin B7. Streptavidin is a protein that is obtained from the bacterium Streptomyces avidinii. It has a very high affinity for biotin, forming one of the strongest non-covalent bondings known. The complex of the two molecules is used extensively in molecular biology and bionanotechnology because of its resistance to organic solvents, other chemicals, and extremes of temperature and pH.
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