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Protein Arginine N‐Methyltransferase Substrate Preferences for Different Nη‐Substituted Arginyl Peptides
Author(s) -
Thomas Dylan,
Koopmans Timo,
Lakowski Ted M.,
Kreinin Helmi,
Vhuiyan Mynol I.,
Sedlock Shona A.,
Bui Jennifer M.,
Martin Nathaniel I.,
Frankel Adam
Publication year - 2014
Publication title -
chembiochem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.05
H-Index - 126
eISSN - 1439-7633
pISSN - 1439-4227
DOI - 10.1002/cbic.201402045
Subject(s) - guanidine , moiety , methylation , arginine , methyltransferase , chemistry , stereochemistry , biochemistry , amino acid , protein arginine methyltransferase 5 , lysine , methionine , residue (chemistry) , enzyme , dna
Protein arginine N‐methyltransferases (PRMTs) catalyze methyl‐group transfer from S ‐adenosyl‐ L ‐methionine onto arginine residues in proteins. In this study, modifications were introduced at the guanidine moiety of a peptidyl arginine residue to investigate how changes to the PRMT substrate can modulate enzyme activity. We found that peptides bearing Nη‐hydroxy or Nη‐amino substituted arginine showed higher apparent k cat values than for the monomethylated substrate when using PRMT1, whereas this catalytic preference was not observed for PRMT4 and PRMT6. Methylation by compromised PRMT1 variants E153Q and D51N further supports the finding that the N‐hydroxy substitution facilitates methyl transfer by tuning the reactivity of the guanidine moiety. In contrast, Nη‐nitro and Nη‐canavanine substituted substrates inhibit PRMT activity. These findings demonstrate that methylation of these PRMT substrates is dependent on the nature of the modification at the guanidine moiety.