5j0n
From Proteopedia
Lambda excision HJ intermediate
Structural highlights
Function[IHFA_ECO45] This protein is one of the two subunits of integration host factor, a specific DNA-binding protein that functions in genetic recombination as well as in transcriptional and translational control. [IHFB_ECO45] This protein is one of the two subunits of integration host factor, a specific DNA-binding protein that functions in genetic recombination as well as in transcriptional and translational control. [VXIS_LAMBD] Excisionase and integrase are necessary for the excision of prophage from the host genome by site-specific recombination at the att site. [VINT_LAMBD] Integrase is necessary for integration of the phage into the host genome by site-specific recombination. In conjunction with excisionase, integrase is also necessary for excision of the prophage from the host genome. Publication Abstract from PubMedThe molecular machinery responsible for DNA expression, recombination, and compaction has been difficult to visualize as functionally complete entities due to their combinatorial and structural complexity. We report here the structure of the intact functional assembly responsible for regulating and executing a site-specific DNA recombination reaction. The assembly is a 240-bp Holliday junction (HJ) bound specifically by 11 protein subunits. This higher-order complex is a key intermediate in the tightly regulated pathway for the excision of bacteriophage lambda viral DNA out of the E. coli host chromosome, an extensively studied paradigmatic model system for the regulated rearrangement of DNA. Our results provide a structural basis for pre-existing data describing the excisive and integrative recombination pathways, and they help explain their regulation. Structure of a Holliday junction complex reveals mechanisms governing a highly regulated DNA transaction.,Laxmikanthan G, Xu C, Brilot AF, Warren D, Steele L, Seah N, Tong W, Grigorieff N, Landy A, Van Duyne GD Elife. 2016 May 25;5. pii: e14313. doi: 10.7554/eLife.14313. PMID:27223329[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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