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Related Concept Videos

Protein Import into the Peroxisomes01:27

Protein Import into the Peroxisomes

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Cells contain membrane-bound organelles called peroxisomes that oxidize organic molecules by transferring hydrogen atoms to oxygen, producing hydrogen peroxide. Peroxisomes enzymatically convert the released hydrogen peroxide into water and oxygen.
Peroxisomal Protein Import:
Peroxisomes lack the genetic machinery required to code for their own proteins. Hence, most peroxisomal membrane, lumenal and transmembrane proteins are synthesized in the cytoplasm or ER and transported to the peroxisome...
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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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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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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Group 1 elements are soft and shiny metallic solids. They are malleable, ductile, and good conductors of heat and electricity. The melting points of the alkali metals are unusually low for metals and decrease going down the group, while the density increases going down the group with the exception of potassium (Table 1).
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Measurement of Protein Import Capacity of Skeletal Muscle Mitochondria
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Metal import through microbial membranes.

Andrew D Ferguson1, Johann Deisenhofer

  • 1Department of Biochemistry, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75390, USA.

Cell
|January 14, 2004
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Summary
This summary is machine-generated.

Gram-negative bacteria use active transporters to import essential metals, overcoming concentration challenges. Structural studies reveal molecular details of these vital metal import pathways in Escherichia coli.

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Area of Science:

  • Microbiology
  • Structural Biology
  • Biochemistry

Background:

  • Gram-negative bacteria possess complex cell envelopes with multiple membranes.
  • Transport systems are crucial for nutrient uptake and maintaining cellular homeostasis.
  • Outer membrane transport is essential for nutrient acquisition but poses a barrier.

Purpose of the Study:

  • To elucidate the molecular mechanisms of active metal import in Gram-negative bacteria.
  • To detail the components involved in transporting metals across cellular membranes.
  • To understand how these systems function against concentration gradients.

Main Methods:

  • Utilized crystallographic structural analysis of transport proteins.
  • Investigated active transport mechanisms coupled to proton gradients and ATP hydrolysis.
  • Focused on metal import pathways in the model organism Escherichia coli.

Main Results:

  • Defined the molecular structures of key components in an active metal import pathway.
  • Demonstrated the coordination of metabolite passage across the cell envelope.
  • Showcased the coupling of transport to energy sources like proton gradients and ATP.

Conclusions:

  • Structural insights provide a detailed molecular understanding of bacterial metal import.
  • Active transporters are essential for nutrient acquisition in Gram-negative bacteria.
  • The findings contribute to understanding bacterial physiology and potential drug targets.