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Nucleobase transporters (review).

H de Koning1, G Diallinas

  • 1Institute of Biomedical and Life Sciences, University of Glasgow, UK.

Molecular Membrane Biology
|September 16, 2000
PubMed
Summary

This review explores how cells move nucleobases like purines and pyrimidines across membranes. These molecules are important for DNA and energy metabolism. The authors looked at transporters in bacteria, fungi, plants, and mammals. They found three main families of transporters: NAT, PRT, and PUP. NAT transporters are found in many organisms, including humans. PRT transporters are limited to bacteria and fungi. PUP transporters are only in plants. The study also notes that mammalian ascorbate transporters are similar to NAT transporters. Researchers suggest that understanding these transporters could help in developing better agricultural and medical treatments. The review highlights the need for more studies on how these proteins work and how they are regulated.

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Area of Science:

  • Molecular biology of transport proteins
  • Nucleotide metabolism in eukaryotes and prokaryotes

Background:

It was already known that nucleobases are essential for nucleic acid synthesis and energy metabolism. However, the mechanisms by which cells transport these molecules across membranes remained unclear in many organisms. Some studies had identified nucleobase transporters in bacteria and fungi, but the extent of their evolutionary distribution was not fully characterized. Vertebrates and protozoa presented challenges due to limited genetic accessibility. The lack of a comprehensive classification system for these transporters hindered progress in understanding their roles. No prior work had resolved the full phylogenetic range of nucleobase transporters. This gap motivated researchers to compile existing data and propose a unified framework. The absence of a clear classification system for these proteins limited functional studies in plants and mammals. That uncertainty drove the need for a systematic review of transporter families and their biological contexts.

Purpose Of The Study:

This review aimed to synthesize available data on nucleobase transporters across different species. The goal was to clarify the evolutionary relationships among these proteins. Researchers focused on identifying common structural and functional themes. They sought to address the lack of a standardized classification system. The study also aimed to highlight how transporter expression is regulated. By compiling genetic and biochemical evidence, the authors intended to guide future research directions. They wanted to emphasize the importance of model systems for studying these proteins. The review aimed to provide a foundation for understanding transporter specificity and function.

Keywords:
Nucleobase transportersNAT familyTransport protein classificationNucleotide metabolism

Frequently Asked Questions

The three families are NAT, PRT, and PUP. NAT transporters are found in archaea, eubacteria, fungi, plants, and metazoa.

PRT transporters are restricted to prokaryotes and fungi.

Mammalian ascorbate transporters are homologous to NAT sequences, suggesting a conserved function.

PUP transporters are unique to plants and may be involved in nucleobase uptake and nitrogen metabolism.

Expression is influenced by environmental and cellular factors, though specific mechanisms vary by species.

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Main Methods:

The authors conducted a literature review of genetic and physiological studies on nucleobase transporters. They analyzed transporter sequences from various databases to identify common motifs. Comparative sequence analysis was used to group transporters into families. The researchers examined transporter function in bacteria, fungi, and plants. They also considered biochemical data from vertebrates and protozoa. The study included a survey of transporter regulation mechanisms. Expression patterns and structural features were compared across species. The authors proposed a classification system based on sequence similarity and functional data.

Main Results:

The review identified three main transporter families: NAT, PRT, and PUP. NAT transporters are found in archaea, eubacteria, fungi, plants, and metazoa. PRT transporters are restricted to prokaryotes and fungi. PUP transporters are unique to plants. Mammalian ascorbate transporters were found to be homologous to NAT sequences. Transporter function varies across species, with some involved in nitrogen metabolism. Regulation of transporter expression is influenced by environmental and cellular factors. Structural studies suggest that transporter specificity is determined by conserved motifs. These findings provide a framework for future functional studies in diverse organisms.

Conclusions:

The authors propose that the three transporter families represent distinct evolutionary lineages. They suggest that NAT transporters may have a conserved role in nucleobase uptake. The presence of homologous sequences in mammals and plants indicates functional conservation. The study highlights the need for further research on transporter regulation. The authors emphasize the importance of model systems for studying these proteins. They suggest that understanding transporter specificity may aid in agricultural and medical applications. The review provides a foundation for future studies on nucleobase transport mechanisms. These findings may guide the selection of appropriate model organisms for functional analysis.

Understanding specificity may help in selecting model systems for agricultural and medical research.