4i1k | pdb_00004i1k

Crystal Structure of VRN1 (Residues 208-341)

spinqualitylabelsall models 4i1k, resolution 1.60Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4i1k is a 2 chain structure with sequence from Arabidopsis thaliana. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Ligands: CL Related: 1wid, 1yel, 3hqf Gene: VRN1, At3g18990, K13E13.10 (Arabidopsis thaliana) Resources: FirstGlance, OCA, RCSB, PDBsum Function [VRN1_ARATH] Involved in the regulation of vernalization. Acts as transcriptional repressor of FLC, a major target of the vernalization pathway. Binds DNA in vitro in a non-sequence-specific manner. Publication Abstract from PubMed The B3 DNA binding domain is a plant-specific domain, found throughout the plant kingdom from the alga Chlamydomonas to grasses and flowering plants. Over 100 B3 domain-containing proteins are found in the model plant Arabidopsis thaliana and one of these is critical for accelerating flowering in response to prolonged cold treatment; an epigenetic process called vernalization. Despite the specific phenotype of genetic vrn1 mutants, the VERNALIZATION1 (VRN1) protein localizes throughout the nucleus and in vitro shows sequence non-specific binding. In this work we used a dominant repressor tag that overcomes genetic redundancy to show that VRN1 is involved in processes beyond vernalization that are essential for Arabidopsis development. To understand its sequence non-specific binding we crystallized VRN1208-341 and solved its crystal structure to 1.6 A resolution using Se-SAD methods. The crystallized construct comprises the second VRN1 B3 domain and a preceding region conserved among VRN1 orthologs, but absent in other B3 domains. We established the DNA binding face using NMR then mutated positively charged residues on this surface with a series of 16 Ala and Glu substitutions ensuring the protein fold was not disturbed using HSQC NMR spectra. A triple mutant R249E R289E R296E was almost completely incapable of DNA binding in vitro. Thus, we have revealed that although VRN1 is sequence non-specific in DNA binding, it has a defined DNA binding surface. The Arabidopsis B3 domain protein VERNALIZATION1 is involved in processes essential for development with structural and mutational studies revealing its DNA binding surface.,King G, Chanson AH, McCallum EJ, Ohme-Takagi M, Byriel K, Hill JM, Martin JL, Mylne JS J Biol Chem. 2012 Dec 19. PMID:23255593 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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