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Articles

Identification of Granule-Bound Starch Synthase in Potato Tubers ¹

Groningen Biotechnology Center, Department of Biochemistry, Nijenborgh 16, 9747 AG Groningen, The Netherlands, Department of Genetics, Kerklaan 30, 9751 NN Haren, The Netherlands

Starch granules isolated from potato (Solanum tuberosum L.) tubers were extracted with sodium dodecyl sulfate and the extract was analyzed. A major protein with a molecular weight of 60,000 daltons was detected. This protein was purified by preparative sodium dodecyl sulfate-gel electrophoresis and specific antibodies were prepared. The anti-60-kilodalton antibodies obtained (a) cross-reacted with the waxy proteins of both maize (Zea mays L.) and grain amaranth (Amaranthus hypochondriacus L.), and (b) inhibited starch synthase activity in partially digested starch granules of the grain amaranth. This evidence strongly suggests that the major 60-kilodalton protein present in potato starch granules represents the granule-bound starch synthase.

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