Document Detail

Nucleotides sequestered at different subsite loci within DNA-binding pockets of two OB-fold single-stranded DNA-binding proteins are unstacked to different extents.
MedLine Citation:
PMID:  23616216     Owner:  NLM     Status:  In-Data-Review    
The gene 5 protein (g5p) encoded by the Ff strains of Escherichia coli bacteriophages is a dimeric single-stranded DNA-binding protein (SSB) that consists of two identical OB-fold (oligonucleotide/oligosaccharide-binding) motifs. Ultrafast time-resolved fluorescence measurements were carried out to investigate the effect of g5p binding on the conformation of 2-aminopurine (2AP) labels positioned between adenines or cytosines in the 16-nucleotide antiparallel tails of DNA hairpins. The measurements revealed significant changes in the conformational heterogeneity of the 2AP labels caused by g5p binding. The extent of the changes was dependent on sub-binding-site location, but generally resulted in base unstacking. When bound by g5p, the unstacked 2AP population increased from ∼22% to 59-67% in C-2AP-C segments and from 39% to 77% in an A-2AP-A segment. The OB-fold RPA70A domain of the human replication protein A also caused a significant amount of base unstacking at various locations within the DNA binding site as evidenced by steady-state fluorescence titration measurements using 2AP-labeled 5-mer DNAs. These solution studies support the concept that base unstacking at most of a protein's multiple sub-binding-site loci may be a feature that allows non-sequence specific OB-fold proteins to bind to single-stranded DNAs (ssDNAs) with minimal preference for particular sequences. © 2013 Wiley Periodicals, Inc. Biopolymers 99: 484-496, 2013.
Hieu N Nguyen; Liang Zhao; Carla W Gray; Donald M Gray; Tianbing Xia
Related Documents :
25037216 - Dynamics of the heme-binding bacterial gas sensing dissimilative nitrate respiration re...
23708546 - Highly selective and sensitive detection of coralyne based on the binding chemistry of ...
97516 - Sarcoplasmic calcium-binding proteins in protochordate and cyclostome muscle: character...
24659536 - Fluorescent protein-based reporters of the actin cytoskeleton in living plant cells: fl...
20382236 - Cerebral serotonin transporter binding is inversely related to body mass index.
2159356 - Gaba and benzodiazepine receptors in the cat motor thalamus after lesioning of nigro- a...
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biopolymers     Volume:  99     ISSN:  0006-3525     ISO Abbreviation:  Biopolymers     Publication Date:  2013 Jul 
Date Detail:
Created Date:  2013-04-25     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0372525     Medline TA:  Biopolymers     Country:  United States    
Other Details:
Languages:  eng     Pagination:  484-96     Citation Subset:  IM    
Copyright Information:
Copyright © 2013 Wiley Periodicals, Inc.
Department of Molecular and Cell Biology, University of Texas at Dallas, Richardson, TX, 75080.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Coordination structures of Mg(2+) and Ca(2+) in three types of tobacco calmodulins in solution: Four...
Next Document:  Bisphosphonate treatment and renal function in 201 myeloma patients undergoing stem cell transplanta...