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  • Title: Storekeeper defines a new class of plant-specific DNA-binding proteins and is a putative regulator of patatin expression.
    Author: Zourelidou M, de Torres-Zabala M, Smith C, Bevan MW.
    Journal: Plant J; 2002 May; 30(4):489-97. PubMed ID: 12028578.
    Abstract:
    The expression of class I patatin genes is restricted to potato tubers but can be induced in other tissues by exogenous sucrose. Here we show that tuber-specific and sucrose-inducible gene expression is reduced in transgenic potato plants by mutations in a conserved 10 base pair motif within the B-box of the patatin promoter. In a southwestern screen, we have isolated a novel DNA-binding protein designated Storekeeper (STK) that specifically recognises the B-box motif in vitro. Gel shift experiments with an STK-specific antibody suggest that STK is the B-box binding protein found in tuber nuclei. We propose that STK, the defining member of a new class of DNA binding proteins, regulates patatin expression in potato tubers via the B-box motif.
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