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Related Concept Videos

ATP Driven Pumps I: An Overview01:27

ATP Driven Pumps I: An Overview

ATP-driven pumps, also known as transport ATPases, are integral membrane proteins. They have binding sites for ATP located on the membrane's cytosolic side and the ion-conducting domain in the transmembrane region. These pumps use the free energy released from ATP hydrolysis to move the solutes across cell membranes against an electrochemical gradient.
There are four main types of ATP-driven pumps - P-type, V-type, F-type, and ABC transporter. All these pumps are of varying complexities and are...
ABC Transporters: Importer01:27

ABC Transporters: Importer

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.
In bacteria, based on the number of transmembrane helices and the chemical nature of their substrates, the ABC importers can be divided into three types:
ATP Synthase: Structure01:18

ATP Synthase: Structure

ATP synthase or ATPase is among the most conserved proteins found in bacteria, mammals, and plants. This enzyme can catalyze a forward reaction in response to the electrochemical gradient, producing ATP from ADP and inorganic phosphate. ATP synthase can also work in a reverse direction by hydrolyzing ATP and generating an electrochemical gradient. Different forms of ATP synthases have evolved special features to meet the specific demands of the cell. Based on their specific feature, ATP...
Electron Transport Chain Components01:29

Electron Transport Chain Components

The electron transport chain (ETC) is a crucial metabolic pathway that facilitates energy conversion in prokaryotic and eukaryotic cells. In eukaryotes, the ETC comprises four membrane-associated protein complexes in the inner mitochondrial membrane. In prokaryotes, the ETC in the plasma membrane can vary in composition, with fewer or different complexes depending on the organism and environmental conditions. These complexes transfer electrons from electron donors, such as NADH and FADH2, to...
Gram-negative Bacterial Protein Secretion Systems01:17

Gram-negative Bacterial Protein Secretion Systems

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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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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From Constructs to Crystals – Towards Structure Determination of β-barrel Outer Membrane Proteins
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Structure, function, and evolution of bacterial ATP-binding cassette systems.

Amy L Davidson1, Elie Dassa, Cedric Orelle

  • 1Department of Chemistry, Purdue University, West Lafayette, IN 47907, USA. adavidso@purdue.edu

Microbiology and Molecular Biology Reviews : MMBR
|June 7, 2008
PubMed
Summary
This summary is machine-generated.

ATP-binding cassette (ABC) systems are vital bacterial proteins involved in nutrient import and toxin export. Research provides new insights into their structure, function, and mechanisms, aiding understanding of human diseases.

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Area of Science:

  • Microbiology
  • Molecular Biology
  • Biochemistry

Background:

  • ATP-binding cassette (ABC) systems are ubiquitous in biology, playing diverse roles in bacterial physiology.
  • ABC transporters facilitate nutrient uptake and toxin efflux, while other ABC proteins regulate processes like DNA repair and gene expression.

Purpose of the Study:

  • To provide insights into the structure, function, and mechanism of action of bacterial ABC proteins.
  • To leverage phylogenetic comparisons and biochemical/genetic approaches for a comprehensive understanding.

Main Methods:

  • Phylogenetic comparisons.
  • Classic biochemical and genetic approaches.
  • Analysis of high-resolution structural data.

Main Results:

  • Detailed insights into the structure and function of bacterial ABC proteins.
  • Proposed models explaining the dynamic mechanisms of ABC transporters.
  • High-resolution structures provide a framework for interpreting functional studies.

Conclusions:

  • Bacterial ABC proteins are complex molecular machines with diverse physiological roles.
  • Understanding bacterial ABC systems informs the study of related eukaryotic proteins and human diseases.
  • Advances in structural biology enhance mechanistic interpretations of ABC protein function.