Seqa-dna Complex
Seqa-dna Complex - Related Videos
11:42
Iterative Optimization of DNA Duplexes for Crystallization of SeqA-DNA Complexes
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2012
Crystal structure of protein–DNA complexes can provide insight into protein function, mechanism, as well as, the nature of the specific interaction. Here, we report how to optimize the length, sequence and ends of duplex DNA for co-crystallization with Escherichia coli SeqA, a negative regulator of replication initiation.
05:13
Isolation of Proteins from Viral DNA-protein Complexes
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2026
Source: Dembowski, J. A., et al. Purification of Viral DNA for the Identification of Associated Viral and Cellular Proteins. J. Vis. Exp. (2017).This video demonstrates the isolation of protein–viral DNA complexes from cell nuclei using click chemistry and magnetic bead purification. The protocol involves labeling viral genomes with alkyne-modified nucleotides, biotinylation via a click reaction, and binding to streptavidin-coated magnetic beads. Following washing and heat elution, the purified...
02:55
Immunoprecipitation of Target Protein-DNA Complexes from Motor Neuron Lysate
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2025
This video demonstrates the immunoprecipitation of DNA fragments crosslinked with target protein from stem cell-derived motor neuron lysates using target protein-specific antibody-coated magnetic beads.
08:30
Visualization of Recombinant DNA and Protein Complexes Using Atomic Force Microscopy
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Cited by 6 •
2011
A tapping mode atomic force microscope (AFM) method for the visualization of plasmid DNA, cytoplasmic proteins, and DNA-protein complexes is described. The method includes alternate approaches for preparing samples for AFM imaging following biochemical manipulation. DNA containing specific protein interacting regions are observed in near-physiologic buffer conditions.
10:23
Self-assembly of Complex Two-dimensional Shapes from Single-stranded DNA Tiles
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Cited by 5 •
2015
DNA tiling is an effective approach to make programmable nanostructures. We describe the protocols to construct complex two-dimensional shapes by the self-assembly of single-stranded DNA tiles.
FAQs
Recognition of hemimethylated GATC sites gives SeqA a timing-sensitive signal. Immediately after replication, these sites carry a methylated strand and an unmethylated strand, marking DNA that has not yet returned to its restored methylation state. SeqA binding therefore connects the chemical status of DNA with temporary control of origin activity.
Its importance lies in preventing the replication origin from being used again immediately after it has initiated replication. This delay gives methylation restoration time to occur, linking origin control to the post-replication state. The result is more orderly cell-cycle progression and reduced risk of inappropriate initiation events.
The complex connects a molecular mark on newly replicated DNA with chromosome-level organization. Because SeqA recognizes methylation-defined post-replication sites, its interactions provide a way to relate local DNA status to broader chromosome architecture. This perspective extends analysis beyond replication timing and helps explain how replication-associated organization contributes to genome stability.
Methylation status functions as a transient indicator of the post-replication interval. The distinction between hemimethylated and restored DNA allows the system to respond specifically after replication. As methylation is restored, the temporary signal changes, making methylation state central to regulating when replication-related control should be maintained or released.
A useful analysis follows three linked features: SeqA recognition of hemimethylated GATC sites, sequestration of the replication origin, and restoration of DNA methylation. Considering these events together clarifies how a post-replication molecular state is translated into control of reinitiation. It also connects binding behavior with chromosome organization and genome stability.
In bacterial biology, the complex is useful for investigating replication timing, prevention of inappropriate initiation, and chromosome architecture. It provides a mechanistic framework for asking how cells coordinate the end of one replication event with the conditions required for the next. Such studies can also address how methylation-linked regulation supports genome stability.