DEVICE FOR TARGET ANALYSIS OF STREPTAVIDIN, AND ANALYSIS METHOD

摘要

The present invention provides a novel sensor for detecting streptavidin (SA). The nucleic acid sensor for analyzing SA of the present invention includes the following nucleic acid element that includes a catalyst nucleic acid molecule (D) that exerts a catalytic function and a binding nucleic acid molecule (A) that binds to SA. The nucleic acid element is a double-stranded nucleic acid element including a first strand and a second strand. The first strand (ss1) includes the binding nucleic acid molecule (A), a loop-forming sequence (L1), and the catalyst nucleic acid molecule (D) linked in this order. The second strand (ss2) includes a stem-forming sequence (S A ), a loop-forming sequence (L2), and a stem-forming sequence (S D ) linked in this order. In this nucleic acid element, in the absence of SA, the catalytic function of the catalyst nucleic acid molecule (D) is inhibited by stem formation in each of the stem-forming sequences (S A ) and (S D ), and in the presence of SA, the stem formation is released by a binding of the binding nucleic acid molecule (A) with the SA, and the catalytic function of the catalyst nucleic acid molecule (D) is exerted.