Determination of the structure of the adduct from guanosine and glycidaldehyde
作者:Vasu Nair、Gregory A. Turner
DOI:10.1016/s0040-4039(00)99852-6
日期:1984.1
The complete structure of the 1:1 adduct between guanosine and glycidaldehyde has been unequivocally determined by high-fieldNMR data and by synthesis of related model compounds.
鸟苷和缩水甘油醛之间的1:1加合物的完整结构已通过高场NMR数据和相关模型化合物的合成明确确定。
Structures of two new “minimalist” modified nucleosides from archaeal tRNA
作者:Shaolian Zhou、Devarasetty Sitaramaiah、Kathleen R Noon、Rebecca Guymon、Takeshi Hashizume、James A McCloskey
DOI:10.1016/j.bioorg.2003.09.005
日期:2004.4
The wyeosine (or wye) family of tricyclic ribonucleosides from archaeal and eukaryal tRNA(Phe) constitutes one of the most complex and interesting series of posttranscriptional RNA modifications, and has been the object of numerous studies of their chemical and biological synthesis and distribution. We report the structures of two minimally elaborated wye derivatives from archaea, raising the known number of wye nucleosides to eight: 3,4-dihydro-6-methyl-3-beta-D-ribofuranosyl-9H-imidazo[1,2-a]purine-9-one (symbol imG-14), and 3,4-dihydro-6,7-dimethyl-3-p-D-ribofuranosyl-9H-imidazo[1,2-a]purine-9-one (symbol imG2). Structures were determined primarily by mass spectrometry, and confirmed by comparison of physicochemical properties with those of chemically synthesized nucleosides. The nucleosides contain no amino acid side chains at C-7 (1H-imidazo[1,2-a]purine nomenclature) and are the only wye derivatives not methylated at N-4. These features suggest a minimal role for wye methyl groups and side chains in maintenance of anticodon stem-loop structures, and support the concept that archaeal tRNA nucleoside modification motifs are generally simpler than those of their counterparts in eukarya and bacteria. (C) 2003 Elsevier Inc. All rights reserved.
we synthesized a group of guanosine analogues containing an additional five-membered ring and a sulfur atom at the C-9 position. The spectral, photophysical, and biological properties of the synthesized compounds were investigated. The spectroscopic studies revealed that a combination of the thiocarbonyl chromophore and the tricyclic structure of guanine analogues shifts the absorption region above