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Title: Synthesis, Oxidation Behavior, Crystallization and Structure of 2'-Methylseleno Guanosine Containing RNAs

We have recently introduced a basic concept for the combined chemical and enzymatic preparation of site-specifically modified 2'-methylseleno RNAs which represent useful derivatives for phasing of X-ray crystallographic data during their three-dimensional structure determination. Here, we introduce the first synthesis of an appropriate guanosine phosphoramidite, which complements the thus far established set of 2'-methylseleno-modified uridine, cytidine, and adenosine building blocks for solid-phase synthesis. The novel building block was readily incorporated into RNA. Importantly, it was the 2'-methylseleno-guanosine-labeled RNA that allowed us to reveal the reversible oxidation/reduction behavior of the Se moiety and thus it represents a valuable contribution to the understanding of the action of threo-1,4-dimercapto-2,3-butanediol (DTT) required during solid-phase synthesis, deprotection, and crystallization of selenium-containing RNA. In addition, we investigated 2'-methylseleno RNA with respect to crystallization properties. Our studies revealed that the Se modification significantly increases the range of conditions leading to crystal growth. Moreover, we determined the crystal structures of model RNA helices and showed that the Se modification can affect crystal packing interactions, thus potentially expanding the possibilities for obtaining the best crystal form.
Authors:
; ; ; ;
Publication Date:
OSTI Identifier:
914283
Report Number(s):
BNL--78851-2007-JA
Journal ID: ISSN 0002-7863; JACSAT; TRN: US200809%%142
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: J. Am. Chem. Soc.; Journal Volume: 128
Research Org:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org:
Doe - Office Of Science
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ADENOSINE; CRYSTAL GROWTH; CRYSTAL STRUCTURE; CRYSTALLIZATION; CYTIDINE; GUANOSINE; MODIFICATIONS; OXIDATION; RNA; SYNTHESIS; URIDINE national synchrotron light source