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Related Concept Videos

Nuclear Localization Signals and Import01:46

Nuclear Localization Signals and Import

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Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
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Bacterial Translocation and Protein Secretion01:26

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Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
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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 Protein Sorting01:34

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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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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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Bacterial RNA Polymerase00:43

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Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
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Nickel recognition by bacterial importer proteins.

Peter T Chivers1

  • 1Department of Chemistry and School of Biological and Biomedical Sciences, Durham University, Durham, UK. peter.chivers@durham.ac.uk.

Metallomics : Integrated Biometal Science
|January 28, 2015
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Nickel transporters are key for microbial growth across diverse environments. Recent structural studies reveal how these proteins recognize and select nickel, offering insights into transport mechanisms.

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Area of Science:

  • Microbiology
  • Biochemistry
  • Structural Biology

Background:

  • Nickel is essential for microbial growth, with its speciation varying across different environments.
  • Understanding nickel uptake mechanisms and the molecular basis of selectivity is crucial for microbial physiology.

Purpose of the Study:

  • To review the structural basis of nickel recognition in primary nickel transporters (ABC and ECF-type).
  • To explore how protein structures inform mechanisms of nickel selectivity during import.
  • To identify key questions and experimental approaches for understanding nickel import.

Main Methods:

  • Comparative analysis of structural data for nickel-importer proteins.
  • Review of existing literature on nickel transport and speciation.
  • Discussion of structural implications for nickel-transfer mechanisms.

Main Results:

  • Recent structures of nickel importers elucidate the initial Ni-recognition step.
  • Structural comparisons highlight potential mechanisms for nickel selectivity in ABC and ECF-type transporters.
  • Structural data raises questions regarding nickel-transfer reactions within import pathways.

Conclusions:

  • Structural biology is advancing our understanding of nickel uptake selectivity.
  • Further experimental validation is needed to confirm the physiological relevance of observed structural mechanisms.
  • Future research should focus on nickel-transfer mechanisms and in vivo validation.