Involved in the synthesis of fructan of the inulin neoseries. Catalyzes a self-transfer between identical oligosaccharides of the 1-kestose series. [1-beta-D-fructofuranosyl-(2->1)-]m+1 alpha-D-glucopyranoside + [1-beta-D-fructofuranosyl-(2->1)-]n+1 alpha-D-glucopyranoside = [1-beta-D-fructofuranosyl-(2->1)-]m alpha-D-glucopyranoside + [1-beta-D-fructofuranosyl-(2->1)-]n+1 beta-D-fructofuranosyl-(2->6)-alpha-D-glucopyranoside (m > 0, n >= 0). [beta-D-fructosyl-(2->1)-]m + [beta-D-fructosyl-(2->1)-]n = [beta-D-fructosyl-(2->1)-]m-1 + [beta-D-fructosyl-(2->1)-]n+1. Optimum pH is 5.68 for both catalytic activities. Stable between pH 5.0-6.3. Stable up to 40 degrees Celsius for both catalytic activities. 6G-FFT activity is induced by high sucrose under continuous light. Both 6G-fFFT and 1-FFT activities are strongly inhibited by HgCl(2), AgNO(3), p-chloromercuribenzoate and SDS, partially inhibited by CaCl(2), MgCl(2), MnCl(2), FeCl(2), CoCl(2), ZnCl(2), SnCl(2), CuSO(4) and EDTA, and activated by sodium deoxycholate, triton X-100 and tween-80. Might be processed in two N-terminal and C-terminal proteolytic fragments. Belongs to the glycosyl hydrolase 32 family.