Home

# Structural study of the DNA fragment d(CGCTGGCCACCG) and a preliminary crystallographic study of the self-complementary DNA sequence d(CGGTGGCCACCG)

 dc.contributor.author Chen, Mei en_US dc.date.accessioned 2007-05-15T15:27:24Z dc.date.available 2007-05-15T15:27:24Z dc.date.issued 1997-05-01T00:00:00Z en_US dc.identifier.uri http://hdl.handle.net/1993/1055 dc.description.abstract This thesis is aimed at elucidating the structures of two DNA fragments, d(CGCTGGCCACCG) (referred to as 'mismatched' DNA hereafter) and d(CGGTGGCCACCG). The fragment d(CGCTGGCCACCG), if duplexed, contains two C-C mismatches which are the least efficiently repaired mismatches and are considered a critical structural element in the development of fragile X syndrome. The fragment d(CGGTGGCCACCG) which is self-complementary contains the sequence GTG/CAC which frequently occurs in regulatory regions and is related to DNA-protein recognition. Small crystals of the DNA fragment d(CGCTGGCCACCG) have been obtained. The effect of individual crystallizing agents on the conformation of the 'mismatched' DNA fragment has been studied and discussed in detail. There is evidence that in the crystallizing solutions the 'mismatched' DNA forms a hairpin structure possibly with the first and the last four bases in the stem in B-DNA helical form and the central four bases in the loop which are partially stacked. Under the same crystallizing condition, the self-complementary DNA is duplexed and its helical type is B-form. Based on the crystallizing experiments, structural studies, and an extensive search of the literature, some suggestions regarding additional crystallizing conditions for the 'mismatched' DNA are made. Two kinds of crystals of the self-complementary DNA sequence d(CGGTGGCCACCG) have been crystallized using $\rm BaCl\sb2$ and $\rm ZnCl\sb2$ as salt, respectively. (Abstract shortened by UMI.) en_US dc.format.extent 6802398 bytes dc.format.extent 184 bytes dc.format.mimetype application/pdf dc.format.mimetype text/plain dc.language en en_US dc.language.iso en_US dc.title Structural study of the DNA fragment d(CGCTGGCCACCG) and a preliminary crystallographic study of the self-complementary DNA sequence d(CGGTGGCCACCG) en_US dc.degree.discipline Chemistry en_US dc.degree.level Master of Science (M.Sc.) en_US
﻿