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A novel family of plant DNA-binding proteins containing both HMG-box and AT-rich interaction domains.

Biochemistry. 2008 Dec 16;47(50):13207-14
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摘要


The A/T-rich interaction domain (ARID) and the HMG-box domain represent DNA-interaction modules that are found in sequence-specific as well as nonsequence-specific DNA-binding proteins. Both domains are found in a variety of DNA-interacting proteins in a wide range of eukaryotic organisms. Proteins that contain both an ARID and an HMG-box domain, here termed ARID-HMG proteins, appear to be specific for plants. This protein family is conserved in higher plants (both mono- and dicot plants) as well as lower plants such as the moss Physcomitrella. Since ARID-HMG proteins have not been studied experimentally, we have examined here two family members from Arabidopsis. The genes encoding ARID-HMG1 and ARID-HMG2 are widely expressed in Arabidopsis but at different levels. Subcellular localization experiments studying ARID-HMG1 and ARID-HMG2 fused to GFP by fluorescence microscopy show that both proteins localize primarily to cell nuclei. Analyses of the DNA-binding properties using electrophoretic mobility shift assays revealed that mediated by the HMG-box domain, ARID-HMG1 binds structure specifically to DNA minicircles. Mediated by the ARID, the protein binds preferentially to A/T-rich DNA, when compared with G/C-rich DNA. Therefore, both DNA-binding domains contribute to the DNA interactions of ARID-HMG1. Accordingly, the protein combines DNA-binding properties characteristic of ARID and HMG-box proteins.

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