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- W2039558800 endingPage "e102364" @default.
- W2039558800 startingPage "e102364" @default.
- W2039558800 abstract "Starch synthase (SS) and branching enzyme (BE) establish the two glycosidic linkages existing in starch. Both enzymes exist as several isoforms. Enzymes derived from several species were studied extensively both in vivo and in vitro over the last years, however, analyses of a functional interaction of SS and BE isoforms are missing so far. Here, we present data from in vitro studies including both interaction of leaf derived and heterologously expressed SS and BE isoforms. We found that SSI activity in native PAGE without addition of glucans was dependent on at least one of the two BE isoforms active in Arabidopsis leaves. This interaction is most likely not based on a physical association of the enzymes, as demonstrated by immunodetection and native PAGE mobility analysis of SSI, BE2, and BE3. The glucans formed by the action of SSI/BEs were analysed using leaf protein extracts from wild type and be single mutants (Atbe2 and Atbe3 mutant lines) and by different combinations of recombinant proteins. Chain length distribution (CLD) patterns of the formed glucans were irrespective of SSI and BE isoforms origin and still independent of assay conditions. Furthermore, we show that all SS isoforms (SSI-SSIV) were able to interact with BEs and form branched glucans. However, only SSI/BEs generated a polymodal distribution of glucans which was similar to CLD pattern detected in amylopectin of Arabidopsis leaf starch. We discuss the impact of the SSI/BEs interplay for the CLD pattern of amylopectin." @default.
- W2039558800 created "2016-06-24" @default.
- W2039558800 creator A5059081299 @default.
- W2039558800 creator A5062794558 @default.
- W2039558800 creator A5081723584 @default.
- W2039558800 creator A5085966490 @default.
- W2039558800 date "2014-07-11" @default.
- W2039558800 modified "2023-10-05" @default.
- W2039558800 title "Analysis of the Functional Interaction of Arabidopsis Starch Synthase and Branching Enzyme Isoforms Reveals that the Cooperative Action of SSI and BEs Results in Glucans with Polymodal Chain Length Distribution Similar to Amylopectin" @default.
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- W2039558800 doi "https://doi.org/10.1371/journal.pone.0102364" @default.
- W2039558800 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/4094495" @default.
- W2039558800 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/25014622" @default.
- W2039558800 hasPublicationYear "2014" @default.
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