3M54

SET7/9 Y305F in complex with TAF10 peptide and AdoHcy

Summary for 3M54

• Entry DOI: 10.2210/pdb3m54/pdb
• Related: 2F69 3M53 3M55 3M56 3M57 3M58 3M59 3M5A
• Descriptor: Histone-lysine N-methyltransferase SETD7, TAF10 peptide, S-ADENOSYL-L-HOMOCYSTEINE, ... (4 entities in total)
• Functional Keywords: ternary complex, set domain, methyltransferase, s-adenosyl-l-homocysteine, taf10 peptide, chromatin regulator, chromosomal protein, nucleus, s-adenosyl-l-methionine, transcription, transcription regulation, transferase
• Biological source: Homo sapiens (human); More
• Cellular location: Nucleus: Q8WTS6
• Total number of polymer chains: 2
• Total formula weight: 30667.21

Authors

Del Rizzo, P.A.,Couture, J.-F.,Roiko, M.S.,Strunk, B.S.,Brunzelle, J.S.,Dirk, L.M.,Houtz, R.L.,Trievel, R.C. (deposition date: 2010-03-12, release date: 2010-07-28, Last modification date: 2024-11-27)

Primary citation

Del Rizzo, P.A.,Couture, J.F.,Dirk, L.M.,Strunk, B.S.,Roiko, M.S.,Brunzelle, J.S.,Houtz, R.L.,Trievel, R.C.
SET7/9 catalytic mutants reveal the role of active site water molecules in lysine multiple methylation.
J.Biol.Chem., 285:31849-31858, 2010

PubMed Abstract: SET domain lysine methyltransferases (KMTs) methylate specific lysine residues in histone and non-histone substrates. These enzymes also display product specificity by catalyzing distinct degrees of methylation of the lysine ε-amino group. To elucidate the molecular mechanism underlying this specificity, we have characterized the Y245A and Y305F mutants of the human KMT SET7/9 (also known as KMT7) that alter its product specificity from a monomethyltransferase to a di- and a trimethyltransferase, respectively. Crystal structures of these mutants in complex with peptides bearing unmodified, mono-, di-, and trimethylated lysines illustrate the roles of active site water molecules in aligning the lysine ε-amino group for methyl transfer with S-adenosylmethionine. Displacement or dissociation of these solvent molecules enlarges the diameter of the active site, accommodating the increasing size of the methylated ε-amino group during successive methyl transfer reactions. Together, these results furnish new insights into the roles of active site water molecules in modulating lysine multiple methylation by SET domain KMTs and provide the first molecular snapshots of the mono-, di-, and trimethyl transfer reactions catalyzed by these enzymes.

PubMed: 20675860
DOI: 10.1074/jbc.M110.114587

Experimental method

X-RAY DIFFRACTION (1.6 Å)