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ABC Transporters: Exporter01:31

ABC Transporters: Exporter

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ATP-binding cassette or ABC transporter is the largest superfamily of integral membrane proteins. The transporters have transmembrane-binding domains (TMDs) and nucleotide-binding domains (NBDs). The TMDs are specific to their substrates, whereas the NBDs are similar to engines that complete ATP hydrolysis to complete the substrate transport. They can be full transporters consisting of two TMDs and NBDs, half transporters with one TMD and NBD, while some encoded with a single TMD or NBD are...
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ABC Transporters: Importer01:27

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ATP-binding cassette or ABC transporters are a class of ATP-driven pumps that hydrolyze ATP to move solutes across the membrane. They can be grouped into importers and exporters. While exporters are present in all domains of life, importers exist only in bacteria and some plants.
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Nuclear Export01:42

Nuclear Export

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The nucleus restricts several proteins within and allows others to pass. The restricted proteins possess a nuclear retention sequence or NRS, anchoring them to the nuclear lamins and preventing their transport to the cytosol. The non-restricted proteins, after their synthesis, are transported to their site of action, such as the cytosol or other organelles, with the help of nuclear export signals or NES.
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Before mRNAs are exported to the cytoplasm, it is crucial to check each mRNA for structural and functional integrity. Eukaryotic cells use several different mechanisms, collectively known as mRNA surveillance, to look for irregularities in mRNAs. Irregular or aberrant mRNA are rapidly degraded by various enzymes. If a defective mRNA escapes the surveillance, it would be translated into a protein which would either be non-functional or not function properly. One of the primary irregularities in...
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No description available
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A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred...
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Hyaluronan release from Streptococcus pyogenes: export by an ABC transporter.

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Streptococcus pyogenes capsule production requires an ATP-binding cassette (ABC) transporter. This finding reveals a new mechanism for exporting bacterial hyaluronan, impacting capsule formation and virulence.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Bacterial Pathogenesis

Background:

  • Capsular hyaluronan in Streptococcus pyogenes is synthesized at the protoplast membrane.
  • It is commonly believed that hyaluronan export is facilitated solely by the synthase, without additional protein involvement.

Purpose of the Study:

  • To investigate the mechanism of hyaluronan export in Streptococcus pyogenes.
  • To identify any additional proteins involved in capsule formation.

Main Methods:

  • Generating an insertional mutation in Streptococcus pyogenes.
  • Analyzing the nucleotide sequence at the insertion site.
  • Complementation assays using DNA encoding the identified ABC transporter system.

Main Results:

  • An insertional mutation led to reduced mucoid phenotype, hyaluronan production, and capsule formation.
  • A gene encoding an ATP-binding cassette (ABC) transporter was identified adjacent to hyaluronan synthesis genes.
  • Complementation with the ABC transporter gene restored the mucoid phenotype and capsule production.

Conclusions:

  • An ATP-binding cassette (ABC) transporter system is essential for efficient Streptococcus pyogenes capsule production.
  • This suggests a novel mechanism for hyaluronan export beyond the synthase activity.
  • The ABC transporter plays a critical role in bacterial virulence through capsule formation.