Folded DNA in Action: Hairpin Formation and Biological Functions in Prokaryotes

被引:151
作者
Bikard, David [1 ,2 ]
Loot, Celine [1 ,2 ]
Baharoglu, Zeynep [1 ,2 ]
Mazel, Didier [1 ,2 ]
机构
[1] Inst Pasteur, Unite Plast Genome Bacterien, Dept Genomes & Genet, F-75015 Paris, France
[2] CNRS, URA2171, F-75015 Paris, France
关键词
SINGLE-STRANDED-DNA; ROLLING-CIRCLE REPLICATION; DEPENDENT ATPASE ACTIVITY; IN-VITRO RECONSTITUTION; INVERTED REPEATED DNA; ESCHERICHIA-COLI; RNA-POLYMERASE; CRUCIFORM FORMATION; SUPERCOILED DNA; LAGGING-STRAND;
D O I
10.1128/MMBR.00026-10
中图分类号
Q93 [微生物学];
学科分类号
071005 ; 100705 ;
摘要
Structured forms of DNA with intrastrand pairing are generated in several cellular processes and are involved in biological functions. These structures may arise on single-stranded DNA (ssDNA) produced during replication, bacterial conjugation, natural transformation, or viral infections. Furthermore, negatively supercoiled DNA can extrude inverted repeats as hairpins in structures called cruciforms. Whether they are on ssDNA or as cruciforms, hairpins can modify the access of proteins to DNA, and in some cases, they can be directly recognized by proteins. Folded DNAs have been found to play an important role in replication, transcription regulation, and recognition of the origins of transfer in conjugative elements. More recently, they were shown to be used as recombination sites. Many of these functions are found on mobile genetic elements likely to be single stranded, including viruses, plasmids, transposons, and integrons, thus giving some clues as to the manner in which they might have evolved. We review here, with special focus on prokaryotes, the functions in which DNA secondary structures play a role and the cellular processes giving rise to them. Finally, we attempt to shed light on the selective pressures leading to the acquisition of functions for DNA secondary structures.
引用
收藏
页码:570 / 588
页数:19
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