4wil | pdb_00004wil

Crystal structure of DCoH2 S51T

spinqualitylabelsall models 4wil, resolution 1.36Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 4wil is a 2 chain structure with sequence from Mus musculus. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.36Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function PHS2_MOUSE Involved in tetrahydrobiopterin biosynthesis. Seems to both prevent the formation of 7-pterins and accelerate the formation of quinonoid-BH2 (By similarity). Regulates the dimerization of homeodomain protein HNF-1-alpha and enhances its transcriptional activity. Publication Abstract from PubMed Pterin-4a-carbinolamin dehydratase (PCD)2 is a highly conserved enzyme that evolved a second, unrelated function in mammals, as a transcriptional coactivator. As a coactivator, PCD is known as DCoH or Dimerization Cofactor of the transcription factor HNF1. These two activities are associated with a change in oligomeric state: from two dimers interacting as an enzyme in the cytoplasm to a dimer interacting with a dimer of HNF1 in the nucleus. The same interface of DCoH forms both complexes. In order to determine how DCoH partitions between its two functions, we studied the folding and stability of the DCoH homotetramer. We show that the DCoH1 homotetramer is kinetically trapped, meaning once it forms it will not dissociate to interact with HNF-1. In contrast DCoH2, a paralog of DCoH1, unfolds within hours. A simple mutation in the interface of DCoH2 from Ser51 to Thr, as found in DCoH1, increases the kinetic stability by nine orders of magnitude, to tau1/2 ~ 2 million years. This suggests that the DCoH1/HNF1 complex must co-fold to interact. We conclude that simple mutations can dramatically affect the dissociation kinetics of a complex. Residue 51 represents a kinetic hot spot instead of a thermodynamic hot spot. Kinetic regulation allows PCD to adopt two distinct functions. Mutations in DCoH1 associated with diabetes affect both functions of DCoH1, perhaps by disrupting the balance between the two DCoH complexes. Interactions with the Bifunctional Interface of the Transcriptional Coactivator DCoH1 Are Kinetically Regulated.,Wang D, Coco MW, Rose RB J Biol Chem. 2014 Dec 23. pii: jbc.M114.616870. PMID:25538247 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

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