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Human DNA is almost two meters long. However, it is compressed inside a tiny nucleus measuring only a few microns in diameter. To make this degree of compaction possible, DNA is organized into several sequential levels so that it can fit into such a tiny space. The most compact form of DNA is a chromosome that can be seen under a microscope in a dividing cell.
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Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...
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The Smc5/6 Core Complex Is a Structure-Specific DNA Binding and Compacting Machine.

Diego Serrano1, Gustavo Cordero2, Ryo Kawamura3

  • 1Ottawa Institute of Systems Biology, Department of Cellular and Molecular Medicine, University of Ottawa, Roger Guindon Hall, 451 Smyth Road, Ottawa, ON K1H 8M5, Canada.

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|December 10, 2020
PubMed
Summary
This summary is machine-generated.

The human Smc5/6 complex compacts unusual DNA structures to maintain genome stability. Mutations in this complex can lead to chromosome breakage syndromes, highlighting its critical role.

Keywords:
DNA compactionDNA repairSMCSmc5/6 complexchromosomegenome stabilitysupercoiled DNA

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Area of Science:

  • Molecular Biology
  • Genetics
  • Biochemistry

Background:

  • Chromosome structure is vital for gene and genome function.
  • Structural Maintenance of Chromosomes (SMC) proteins are key regulators of chromosome dynamics.
  • The precise role of the Smc5/6 complex in genome stability remains unclear.

Purpose of the Study:

  • To elucidate the mechanism by which the human Smc5/6 complex maintains genome stability.
  • To investigate the DNA-binding and compaction activities of the Smc5/6 complex.

Main Methods:

  • Structural analyses of the human Smc5/6 complex.
  • Biochemical assays to study DNA compaction and ATP hydrolysis.
  • Analysis of mutations associated with human chromosome breakage syndromes.

Main Results:

  • The Smc5/6 complex recognizes and compacts unusual DNA configurations using ATP hydrolysis.
  • Structural insights reveal critical subunit interfaces essential for Smc5/6 function.
  • Specific mutations disrupt Smc5/6 functionality, linking it to chromosome breakage.

Conclusions:

  • The Smc5/6 complex acts as a DNA micro-compaction machine, essential for genome stability.
  • Understanding Smc5/6 function provides insights into human chromosome breakage syndromes.
  • This study clarifies the molecular mechanism of Smc5/6 in maintaining genomic integrity.