title: Crystal structure of the plant epigenetic protein arginine methyltransferase 10.
abstract: Protein arginine methyltransferase 10 (PRMT10) is a type I arginine methyltransferase that is essential for regulating flowering time in Arabidopsis thaliana. We present a 2.6 Å resolution crystal structure of A. thaliana PRMT 10 (AtPRMT10) in complex with a reaction product, S-adenosylhomocysteine. The structure reveals a dimerization arm that is 12-20 residues longer than PRMT structures elucidated previously; as a result, the essential AtPRMT10 dimer exhibits a large central cavity and a distinctly accessible active site. We employ molecular dynamics to examine how dimerization facilitates AtPRMT10 motions necessary for activity, and we show that these motions are conserved in other PRMT enzymes. Finally, functional data reveal that the 10 N-terminal residues of AtPRMT10 influence substrate specificity, and that enzyme activity is dependent on substrate protein sequences distal from the methylation site. Taken together, these data provide insights into the molecular mechanism of AtPRMT10, as well as other members of the PRMT family of enzymes. They highlight differences between AtPRMT10 and other PRMTs but also indicate that motions are a conserved element of PRMT function.
authors: Department of Biochemistry and Biophysics, University of North Carolina at Chapel Hill, Chapel Hill, NC 27599, USA.
authors: Yuan
authors: Y
authors: Cheng
authors: Monica
authors: M
authors: Frazier
authors: Falong
authors: F
authors: Lu
authors: Xiaofeng
authors: X
authors: Cao
authors: Matthew R
authors: MR
authors: Redinbo
mesh_terms: D000595:Amino Acid Sequence; D017360:Arabidopsis / Q000378:metabolism*; D029681:Arabidopsis Proteins / Q000737:chemistry* / Q000378:metabolism*; D020134:Catalytic Domain; D018360:Crystallography, X-Ray; D008745:Methylation; D008780:Methyltransferases / Q000737:chemistry* / Q000378:metabolism*; D008958:Models, Molecular; D056004:Molecular Dynamics Simulation; D008969:Molecular Sequence Data; D011487:Protein Conformation; D055503:Protein Multimerization; D017433:Protein Structure, Secondary; D012435:S-Adenosylhomocysteine / Q000737:chemistry / Q000378:metabolism*; D017386:Sequence Homology, Amino Acid; D013379:Substrate Specificity
chemical_list: D029681:Arabidopsis Proteins; D012435:S-Adenosylhomocysteine; D008780:Methyltransferases; C529430:PRMT10 protein, Arabidopsis