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Department of Biophysics, Weizmann Institute of Science, Rehovot, Israel.
During the last decade, avidin-biotin technology has become a commercially viable tool for research, medical and industrial applications. From the beginning, mediation via the avidin-biotin complex was proposed for affinity-based separations. This particular application, however, has been slow in gaining acceptance. One of the reasons is that the strength of binding between avidin and biotin is sometimes inappropriate for the desired affinity system. Another problem involves certain "undesirable" structural properties in the avidin molecule which may lead to high levels of "non-specific" binding. Recent progress in understanding the molecular requirements for binding biotin may eventually lead to the design of avidin-like proteins which will exhibit preferred recognition properties according to the desired application.
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