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Reversible and easy to use, temperature-sensitive (TS) mutations are powerful tools for studying gene function. However, TS alleles are rare and difficult to generate and identify, and this has limited their use in most multicellular organisms. We have generated and characterized 41 intein switches, temperature-sensitive Sce VMA mutations that splice only at the permissive temperatures to generate intact host proteins. At nonpermissive temperatures, they fail to splice, resulting in a loss of function of the proteins in which they reside. By inserting an intein switch into a protein of interest, one can turn on and off the activities of the engineered protein with a simple temperature shift. The 41 TS inteins function in five different temperature ranges, with permissive temperatures ranging from 18 degrees to 30 degrees . This collection makes it possible to choose a TS-intein switch according to the optimal growth temperature of an organism or to suit a special experimental design.

genetics

Temperature-Sensitive Mutations Made Easy: Generating Conditional Mutations by Using Temperature-Sensitive Inteins That Function Within Different Temperature Ranges