Pathways of arsenic uptake and efflux

Area of Science:

• Environmental Science
• Biochemistry
• Toxicology

Background:

• Arsenic is a widespread toxic metalloid found ubiquitously in the environment.
• Organisms have developed resistance mechanisms against arsenic toxicity.
• Cellular uptake of arsenic compounds occurs via nutrient transporters.

Purpose of the Study:

• To review known arsenic transport systems across different kingdoms.
• To outline the properties and substrates of these arsenic transporters.
• To identify knowledge gaps and discuss the role of arsenic transport in the global arsenic biogeocycle and human health.

Main Methods:

• Literature review of existing research on arsenic transport.
• Analysis of data on transporter families involved in arsenic resistance.
• Synthesis of information on arsenic uptake and efflux mechanisms.

Main Results:

• Arsenic uptake primarily occurs via phosphate, aquaglyceroporin, and sugar permease systems.
• Cytosolic efflux is the most common tolerance strategy, mediated by various transporter families.
• Key transporter families include aquaglyceroporins, Major Facilitator Superfamily (MFS), and ATP-binding cassette (ABC) transporters.

Conclusions:

• Arsenic transport systems are diverse and conserved across life.
• Understanding these systems is critical for addressing arsenic's impact on human health and the environment.
• Further research is needed to discover novel arsenic transporters and fully elucidate their functions.