Methods for the Identification of Methyltransferase Interacting Molecules and for the Purification of Methyltransferase Proteins

An immobilization compound of formula (I)

• or a salt thereof, wherein
• L is a C1-10 alkylene group, which is optionally interrupted by one or more atoms or functional groups independently selected from the group consisting of O, NH, N(CH3), C(O)O, OC(O)NHC(O), C(O)NH, N(CH3)C(O), and C(O)N(CH3);
• X is S, S(CH3) NH, N(CH3), O, CH2, CH(CH3), or C(CH3)2;
• Q is NH, or O;
• Y is NH2, CO2H, NH(CH3), SH, or OH.