Granule-bound starch synthase I

Table 10.12 Granule-bound starch synthase I (Wx-A1, Wx-B1, and Wx-D1 proteins) and amylose levels in near-isogenic lines266 and isolines273 of wheat...

Antibody prepared against SSSI effectively neutralized SSSI activity, but has little or no effect on either the activities of granule-bound starch synthases I or II or even on SSSII. A result consistent with that obtained with the SSS antiserum is the observation that antibody prepared against the starch granule-bound proteins effectively inhibits granule-bound starch synthase I activity, but has little effect on the SSS (Macdonald and Preiss, 1985). 

Vrinten PL, Nakamura T. Wheat granule-bound starch synthase I and II are encoded by separate genes that are expressed in different tissues. Plant Physiol. 2000 122 255-264. 

The cDNA clones that encode the two isozymes of granule-bound starch synthase of the pea embryo are optimally expressed at different times during development (Dry et al., 1992) although isozyme II is expressed in every organ, isozyme I is not expressed in roots, stipules, or flowers (Dry et al., 1992). 

Dry, I., Smith, A., Edwards, A., Bhattarcharyya, M., Dunn, P., and Martin, C. 1992. Characterization of cDNAs encoding two isoforms of granule-bound starch synthase which show differential expression in developing storage organs of pea and potato. Plant J. 2,193-202. 

Visser REG, Somhorst I, Kuipers GJ, Ruys NT, Feenstra WJ, Jacobsen E. Inhibition of the gene for granule-bound starch synthase in potato by antisense constructs. Molec. Gen. Genetics 1991 225 289-296. 

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