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- W2034452801 abstract "α-d-Galactosidase (α-Gal; EC 3.2.1.22) is one of three principal enzymes involved in the modification or degradation of plant cell wall galactomannans. In the present paper it is shown that α-galactosidase activities in field-grown coffee beans are variable amongst cultivars of the two species investigated (Coffea arabica and C. canephora var. Robusta). Higher activities were found in Arabica cultivars. Using beans from greenhouse-cultivated C. arabica as a model, we showed that α-Gal activity was undetectable in the bean perispem tissue, but increased gradually during the endosperm development, to reach a peak at approximately 30 weeks after flowering (WAF) which coincided with the hardening of the endosperm. α-Gal-specific transcripts detected at 22 and 27 WAF accompanied the peak of α-Gal activity, but were reduced to be undetectable in mature beans at 30 WAF, while α-Gal activity still persisted. Two isoforms were distinguished in 2-DE profiles of crude protein extracts by N-terminal sequencing analysis. Analysis of two-dimensional gel electrophoresis profiles demonstrated that both isoforms accumulated in a linear fashion throughout grain maturation. α-Gal activity was also observed to increase to high levels during in vitro germination of coffee beans suggesting an important function of this enzyme in this process. α-Gal cDNA sequences from Arabica and Robusta were sequenced and their deduced proteins appeared to be very similar, differing by only eight amino acids. Southern-blot analysis suggests that the enzyme was encoded by at least two genes in C. arabica that could explain the existence of the two isoforms identified in 2-DE profiles." @default.
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- W2034452801 date "2005-10-01" @default.
- W2034452801 modified "2023-09-26" @default.
- W2034452801 title "Biochemical and molecular characterization of α-d-galactosidase from coffee beans" @default.
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- W2034452801 doi "https://doi.org/10.1016/j.plaphy.2005.08.010" @default.
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