Synthesis and hybridization of 2′-O-methyl-RNAs incorporating 2′-O-carbamoyluridine and unique participation of the carbamoyl group in U–G base pair
作者:Kohji Seio、Ryuya Tawarada、Takeshi Sasami、Masashi Serizawa、Misako Ise、Akihiro Ohkubo、Mitsuo Sekine
DOI:10.1016/j.bmc.2009.08.053
日期:2009.10
2'-O-Carbamoyluridine (U-cm) was synthesized and incorporated into DNAs and 2,-O-Me-RNAs. The oligonucleotides incorporating U-cm formed less stable duplexes with their complementary and U-cm-U, U-cm-C single-base mismatched DNAs and RNAs in comparison with those without the carbamoyl group. On the contrary, the T-m analyses revealed that the duplexes with a mismatched U-cm-G base pair showed almost the same thermostability as the corresponding unmodified duplexes. Molecular dynamics (MD) simulations of the U-cm-modified 2'-O-Me-RNA/RNA duplexes with U-cm-G mismatched base pair suggested that the carbamoyl group could participate in the U-cm-G base pair by an additional intermolecular hydrogen bond between the carbamoyl oxygen and the H2 of the guanine base. (C) 2009 Elsevier Ltd. All rights reserved.