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. 1993 Jun 15;90(12):5534–5538. doi: 10.1073/pnas.90.12.5534

Conservation of genetic information: a code for site-specific DNA recognition.

L F Harris 1, M R Sullivan 1, D F Hickok 1
PMCID: PMC46755  PMID: 8516297

Abstract

We present findings of genetic information conservation between the glucocorticoid response element (GRE) DNA and the cDNA encoding the glucocorticoid receptor (GR) DNA-binding domain (DBD). The regions of nucleotide sub-sequence similarity to the GRE in the GR DBD occur specifically at nucleotide sequences on the ends of exons 3,4, and 5 at their splice junction sites. These sequences encode the DNA recognition helix on exon 3, a beta-strand on exon 4, and a putative alpha-helix on exon 5, respectively. The nucleotide sequence of exon 5 that encodes the putative alpha-helix located on the carboxyl terminus of the GR DBD shares sequence similarity with the flanking nucleotide regions of the GRE. We generated a computer model of the GR DBD using atomic coordinates derived from nuclear magnetic resonance spectroscopy to which we attached the exon 5-encoded putative alpha-helix. We docked this GR DBD structure at the 39-base-pair nucleotide sequence containing the GRE binding site and flanking nucleotides, which contained conserved genetic information. We observed that amino acids of the DNA recognition helix, the beta-strand, and the putative alpha-helix are spatially aligned with trinucleotides identical to their cognate codons within the GRE and its flanking nucleotides.

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