The onion fructosyltransferase fructan:fructan 6G-fructosyltransferase (6G-FFT) synthesizes fructans of the inulin neo-series using 1-kestose as a substrate. 6G-FFT couples a fructosyl residue to either the terminal glucose via a β(2-6) linkage or a terminal fructose via a β(2-1) linkage. The sucrose-binding box is present at the N-terminus of invertases and fructosyltransferases. We tested its function by producing swaps of the first 36 amino acids of 6G-FFT with that of onion sucrose:sucrose 1-fructosyltransferase (1-SST) (SST-GFT) and vacuolar invertase (INV-GFT). In contrast to 6G-FFT, invertase and 1-SST are able to utilize sucrose as their only substrate. The chimerical enzymes were unable to use sucrose, but were active when incubated with 1-kestose. INV-GFT synthesized a similar array of fructans as 6G-FFT, in contrast, SST-GFT showed a dramatic shift in activity towards synthesis of β(2-1) linkages. Thus the region containing the sucrose-binding box is directing the fructan type synthesized. In invertases, the β-fructosidase motif, which is part of the sucrose-binding box, consists of NDPNG/A. This motif is variable in fructosyltransferases and consists of NDPSG in 6G-FFT and ADPNA in 1-SST of onion. We studied the importance of the 6G-FFT β-fructosidase motif using mutants S87N (NDPNG) and N84A;S87N (ADPNG). S87N has 6G-FFT activity, whereas N84A;S87N has a activity that was shifted towards synthesis of β(2-1) linkages. This is in agreement with the observed activities of the chimerical proteins and indicates that the β-fructosidase motif of the sucrose-binding box is specifying the fructan type synthesized.
Plant Molecular Biology – Springer Journals
Published: Dec 30, 2004
It’s your single place to instantly
discover and read the research
that matters to you.
Enjoy affordable access to
over 18 million articles from more than
15,000 peer-reviewed journals.
All for just $49/month
Query the DeepDyve database, plus search all of PubMed and Google Scholar seamlessly
Save any article or search result from DeepDyve, PubMed, and Google Scholar... all in one place.
Get unlimited, online access to over 18 million full-text articles from more than 15,000 scientific journals.
Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.
All the latest content is available, no embargo periods.
“Hi guys, I cannot tell you how much I love this resource. Incredible. I really believe you've hit the nail on the head with this site in regards to solving the research-purchase issue.”Daniel C.
“Whoa! It’s like Spotify but for academic articles.”@Phil_Robichaud
“I must say, @deepdyve is a fabulous solution to the independent researcher's problem of #access to #information.”@deepthiw
“My last article couldn't be possible without the platform @deepdyve that makes journal papers cheaper.”@JoseServera