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Related Concept Videos

Membrane Transporters01:31

Membrane Transporters

Transporters are essential membrane transport proteins with functions related to cell nutrition, homeostasis, communication, etc. Approximately 7% of all genes in the human genome code for transporters or transporter-related proteins.
Transporters are mainly composed of alpha-helices, built from bundles of ten or more helices traversing the plasma membrane. The solute-binding sites are located midway, where some of the helices are broken or distorted, making space for the binding site through...
Pharmacogenetics of Drug Transporters: P-Glycoprotein and Solute Carrier Transporters01:16

Pharmacogenetics of Drug Transporters: P-Glycoprotein and Solute Carrier Transporters

The pharmacogenetics of drug transporters is increasingly recognized as a critical factor influencing interindividual variability in drug absorption, distribution, and elimination. These membrane-bound proteins regulate drugs' movement across cellular barriers by actively pumping them out (efflux) or facilitating their uptake (influx). Among the major transporter families, ATP-binding cassette (ABC) and solute carrier (SLC) transporters play particularly prominent roles. Genetic polymorphisms...
Glucose Transporters01:27

Glucose Transporters

Glucose transporters facilitate the transport of glucose across the cell membrane. In addition to glucose, some glucose transporters can also aid the movement of other hexoses such as fructose, mannose, and galactose.
Facilitated diffusion-glucose transporters (GLUTs) are encoded by the solute-linked carrier (SLC) family 2, subfamily A gene family, or SLC2A. The 14 GLUT protein members are distributed into three classes:
Active Transport01:14

Active Transport

Active transport is a critical biological process that allows cells to move solutes against an electrochemical gradient. This process requires direct energy input and is characterized by its selectivity, saturability, and susceptibility to competitive inhibition.
Primary active transporters, like Na+, K+ and -ATPase, directly utilize ATP to move ions across the membrane. These transporters play significant roles in various physiological processes. For instance, Na+, K+ and -ATPase maintain...
Drug Absorption Mechanism: Carrier-Mediated Membrane Transport01:19

Drug Absorption Mechanism: Carrier-Mediated Membrane Transport

Certain large, lipid-insoluble drug molecules that resemble amino acids, peptides, or glucose, require specialized carrier proteins to facilitate their diffusion across cell membranes. This transport can occur through either facilitated diffusion, which does not require energy input, or active transport, which does require energy input.
Facilitated diffusion is a passive process that utilizes human Solute Carrier (SLC) transporters. These transporters bind to the drug, undergo structural...
ABC Transporters: Exporter01:31

ABC Transporters: Exporter

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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High-Throughput Expression and Purification of Human Solute Carriers for Structural and Biochemical Studies
07:10

High-Throughput Expression and Purification of Human Solute Carriers for Structural and Biochemical Studies

Published on: September 29, 2023

SLC4A transporters.

Inyeong Choi1

  • 1Department of Physiology, Emory University, Atlanta, Georgia, USA. ichoi@emory.edu

Current Topics in Membranes
|November 27, 2012
PubMed
Summary
This summary is machine-generated.

The SLC4A gene family facilitates acid-base balance by transporting bicarbonate ions (HCO3-). Structure-function studies reveal critical molecular mechanisms for ion transport and protein interactions in these vital transporters.

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Area of Science:

  • Molecular Biology
  • Biochemistry
  • Physiology

Background:

  • The SLC4A gene family encodes bicarbonate transporters crucial for regulating intracellular pH and acid-base homeostasis.
  • These transporters include various types like Cl/HCO3 exchangers and Na/HCO3 cotransporters.
  • Their physiological importance is well-established at both cellular and systemic levels.

Purpose of the Study:

  • To elucidate the molecular mechanisms of ion transport within the SLC4A family.
  • To detail the structural aspects influencing transporter regulation, ion translocation, and protein topology.
  • To provide insights into the structure of specific transporters like SLC4A1 (AE1) and SLC4A4 (NBCe1).

Main Methods:

  • Analysis of structure-function relationships using mutagenesis of specific residues.
  • Construction and study of chimeric transporter constructs.
  • Review of in vitro and in vivo studies on SLC4A transporter function.

Main Results:

  • Structure-function studies have identified critical domains and motifs for transporter regulation and ion movement.
  • Mutagenesis and chimeric constructs have elucidated the molecular basis of ion translocation mechanisms.
  • Insights into the structural features of SLC4A1 and SLC4A4 transporters have been gained.

Conclusions:

  • Understanding the molecular mechanisms and structural features of SLC4A transporters is key to comprehending acid-base homeostasis.
  • Structure-function analyses provide critical information on how these transporters move ions and interact with other proteins.
  • Further research into SLC4A transporter structures will enhance our knowledge of cellular and systemic acid-base balance.