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Related Concept Videos

Restriction Enzymes01:11

Restriction Enzymes

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Restriction enzymes are bacterial enzymes used to cut DNA in a sequence-specific manner. To cleave DNA, they bind to specific palindromic sequences called restriction sites. Such palindromic DNA sequences or inverted repeats are commonly found in regions of functional significance, such as the origin of replication, gene operator sites, and regions containing transcription termination signals.
The host bacteria protect their own genomic DNA from these enzymes by methylating these sites. Some...
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Inhibitors of Bacterial DNA Synthesis01:28

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Bacterial pathogens depend on precise and efficient DNA replication to sustain infection. Two type II topoisomerases—DNA gyrase and topoisomerase IV—are critical to this process, as they resolve DNA supercoiling and unlink chromosomes during replication. Fluoroquinolones, synthetic derivatives of quinolones, exploit this mechanism by stabilizing the transient DNA–enzyme cleavage complex, preventing strand religation, and causing lethal double-strand breaks. These...
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Bacterial conjugation is a mechanism of horizontal gene transfer that enables the exchange of genetic material between bacterial cells through direct contact. This process is facilitated by a donor cell carrying a conjugative plasmid, which encodes genes necessary for pilus formation, DNA replication, and transfer. The conjugative plasmid plays a central role in initiating and executing the transfer of genetic material.The tra region of the conjugative plasmid encodes proteins responsible for...
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CRISPR and crRNAs02:53

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Bacteria and archaea are susceptible to viral infections just like eukaryotes; therefore, they have developed a unique adaptive immune system to protect themselves. Clustered regularly interspaced short palindromic repeats and CRISPR-associated proteins (CRISPR-Cas) are present in more than 45% of known bacteria and 90% of known archaea.
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DNA Topoisomerases02:02

DNA Topoisomerases

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Topoisomerases are enzymes that relax overwound DNA molecules during various cell processes, including DNA replication and transcription. These enzymes regulate positive and negative DNA supercoiling without changing the nucleotide sequence. DNA overwinding in a clockwise direction results in positively supercoiled DNA, whereas underwinding in a counterclockwise direction produces negatively supercoiled DNA.
Types and Mechanism of action
Topoisomerases are divided into two main types. ...
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Gram-negative Bacterial Protein Secretion Systems01:17

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Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
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In Vitro Directed Evolution of a Restriction Endonuclease with More Stringent Specificity
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Distinct facilitated diffusion mechanisms by E. coli Type II restriction endonucleases.

Adam J Pollak1, Aaron T Chin, Norbert O Reich

  • 1Department of Chemistry and Biochemistry, University of California at Santa Barbara , Santa Barbara, California 93106, United States.

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Summary

Proteins use different DNA search strategies. EcoRI endonuclease extensively slides along DNA, while EcoRV endonuclease relies more on hopping, revealing distinct protein-DNA interaction mechanisms.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Genetics

Background:

  • Proteins must locate specific DNA sequences for essential cellular processes like gene regulation and DNA repair.
  • The mechanisms proteins use to search for DNA sequences are diverse and not fully understood.
  • Understanding these search mechanisms is key to comprehending protein-DNA interactions and their biological roles.

Purpose of the Study:

  • To compare the DNA translocation properties of two bacterial restriction endonucleases, EcoRI and EcoRV.
  • To elucidate the distinct site-locating strategies employed by these enzymes.
  • To understand how different search mechanisms relate to protein function and biological roles.

Main Methods:

  • Comparative analysis of translocation properties of EcoRI and EcoRV endonucleases.
  • Investigation of DNA binding and dissociation mechanisms, including sliding and hopping.
  • Examination of enzyme concentrations and their potential influence on search efficiency.

Main Results:

  • EcoRI endonuclease exhibits extensive DNA sliding (up to ~600 bp) before dissociation.
  • EcoRV endonuclease relies more heavily on hopping mechanisms for DNA sequence searching.
  • EcoRI's sliding mechanism ensures a thorough DNA search, while EcoRV's hopping provides an extended but less rigorous interrogation.

Conclusions:

  • Proteins utilize distinct DNA search mechanisms, such as sliding and hopping, tailored to their specific functions.
  • Mechanistic differences in DNA searching complement other enzyme properties, like concentration, influencing biological roles.
  • Bacterial defense systems likely employ enzymes with complementary search strategies for efficient foreign DNA processing.