Subtopic Deep Dive

ABC Transporters of Amino Acids
Research Guide

What is ABC Transporters of Amino Acids?

ABC transporters of amino acids are ATP-binding cassette proteins that export amino acids, accumulate osmolytes, and contribute to multidrug resistance in bacteria, plants, and mammals.

These transporters use ATP hydrolysis to drive amino acid transport across membranes (Saier et al., 2013). Research spans bacterial multidrug exporters like EmrE to mammalian peptide transporters (Yerushalmi et al., 1995). Over 10 papers in provided lists classify and analyze these systems, with TCDB cataloging >10,000 transport proteins.

Curated Papers

Key Challenges

Why It Matters

ABC transporters enable bacterial survival under osmotic and antibiotic stress, informing antibiotic development (Yerushalmi et al., 1995; Saier et al., 2013). In mammals, they regulate peptide transport at barriers like the blood-brain barrier, impacting epilepsy and drug delivery (Oby and Janigro, 2006). Amino acid export links to cancer cell glutathione regulation and multidrug resistance (Ortega et al., 2011).

Key Research Challenges

Structural Diversity Classification

Classifying ABC transporters among >10,000 families in TCDB remains challenging due to evolutionary divergence (Saier et al., 2013). Bacterial exporters like EmrE show unique 12-kDa structures unlike larger mammalian systems (Yerushalmi et al., 1995).

Regulation Mechanisms

CRP regulates carbon metabolism but amino acid transporter control under stress needs mapping (Shimada et al., 2011). Links to SLC superfamily complicate mammalian regulation studies (He et al., 2009).

Multidrug Resistance Evolution

MOP exporter superfamily integrates ABC with MATE families, hindering targeted inhibition (Hvorup et al., 2003). Extreme environment adaptations in bacteria challenge therapeutic design (Konings et al., 2002).

Essential Papers

The Transporter Classification Database

Milton H. Saier, Vamsee Reddy, Dorjee G. Tamang et al. · 2013 · Nucleic Acids Research · 510 citations

The Transporter Classification Database (TCDB; http://www.tcdb.org) serves as a common reference point for transport protein research. The database contains more than 10,000 non-redundant proteins ...

Amino acid metabolism in health and disease

Zhenan Ling, Yifan Jiang, Jun-Nan Ru et al. · 2023 · Signal Transduction and Targeted Therapy · 417 citations

Abstract Amino acids are the building blocks of protein synthesis. They are structural elements and energy sources of cells necessary for normal cell growth, differentiation and function. Amino aci...

The Blood–Brain Barrier and Epilepsy

Emily R. Oby, Damir Janigro · 2006 · Epilepsia · 380 citations

Summary: During the past several years, there has been increasing interest in the role of the blood–brain barrier (BBB) in epilepsy. Advances in neuroradiology have enhanced our ability to image an...

Analysis and update of the human solute carrier (SLC) gene superfamily

Lei He, Konstandinos Vasiliou, Daniel W. Nebert · 2009 · Human Genomics · 350 citations

EmrE, an Escherichia coli 12-kDa Multidrug Transporter, Exchanges Toxic Cations and H+ and Is Soluble in Organic Solvents

Hagit Yerushalmi, Mario Lebendiker, Shimon Schuldiner · 1995 · Journal of Biological Chemistry · 328 citations

The smallest membrane protein shown to catalyze ion-coupled transport is documented in this report. A gene coding for a small 110-amino acid membrane protein (emrE or mvrC) has been previously iden...

Glutathione in Cancer Cell Death

Ángel Ortega, Salvador Mena, José M. Estrela · 2011 · Cancers · 301 citations

Glutathione (L-γ-glutamyl-L-cysteinyl-glycine; GSH) in cancer cells is particularly relevant in the regulation of carcinogenic mechanisms; sensitivity against cytotoxic drugs, ionizing radiations, ...

Novel Roles of cAMP Receptor Protein (CRP) in Regulation of Transport and Metabolism of Carbon Sources

Tomohiro Shimada, Nobuyuki Fujita, Kaneyoshi Yamamoto et al. · 2011 · PLoS ONE · 259 citations

CRP (cAMP receptor protein), the global regulator of genes for carbon source utilization in the absence of glucose, is the best-studied prokaryotic transcription factor. A total of 195 target promo...

Reading Guide

Foundational Papers

Start with Saier et al. (2013) TCDB for classification framework (510 citations), then Yerushalmi et al. (1995) EmrE for bacterial prototype (328 citations), and He et al. (2009) SLC for mammalian context (350 citations).

Recent Advances

Ling et al. (2023, 417 citations) on amino acid metabolism disorders; Shimada et al. (2011) CRP regulation (259 citations).

Core Methods

TCDB bioinformatic classification, heterologous expression for transport assays (EmrE), CRP transcription factor binding analysis.

How PapersFlow Helps You Research ABC Transporters of Amino Acids

Discover & Search

Research Agent uses searchPapers and citationGraph on 'ABC transporters amino acids' to map Saier et al. (2013) TCDB as central hub with 510 citations, then exaSearch for bacterial exporters linking to Yerushalmi et al. (1995) EmrE.

Analyze & Verify

Analysis Agent applies readPaperContent to parse TCDB entries from Saier et al. (2013), verifies export mechanisms with verifyResponse (CoVe), and runs PythonAnalysis on sequence data for homology stats with GRADE scoring for structural claims.

Synthesize & Write

Synthesis Agent detects gaps in bacterial vs. mammalian ABC regulation, flags contradictions between EmrE H+/cation exchange and SLC overlaps (Yerushalmi et al., 1995; He et al., 2009); Writing Agent uses latexEditText, latexSyncCitations, and latexCompile for review manuscripts with exportMermaid for transporter topology diagrams.

Use Cases

"Analyze EmrE amino acid export kinetics from Yerushalmi 1995 with modern stats."

Research Agent → searchPapers 'EmrE ABC transporter' → Analysis Agent → readPaperContent + runPythonAnalysis (pandas curve fitting on flux data) → statistical verification output with R² scores.

"Draft LaTeX figure of ABC transporter phylogeny citing Saier TCDB."

Synthesis Agent → gap detection on classifications → Writing Agent → latexGenerateFigure + latexSyncCitations (Saier et al., 2013) + latexCompile → compiled PDF with phylogenetic tree.

"Find GitHub code for ABC transporter simulations linked to papers."

Research Agent → citationGraph 'Saier TCDB' → Code Discovery → paperExtractUrls → paperFindGithubRepo → githubRepoInspect → molecular dynamics scripts for EmrE models.

Automated Workflows

Deep Research workflow scans 50+ TCDB-linked papers via searchPapers → citationGraph → structured report on ABC amino acid exporters (Saier et al., 2013). DeepScan applies 7-step CoVe analysis to EmrE multidrug data with GRADE checkpoints (Yerushalmi et al., 1995). Theorizer generates hypotheses on CRP-ABC regulation from Shimada et al. (2011) metabolism networks.

Try Doxa for ABC Transporters of Amino Acids Research

Frequently Asked Questions

What defines ABC transporters of amino acids?

ATP-binding cassette proteins that hydrolyze ATP to export amino acids and osmolytes, classified in TCDB (Saier et al., 2013).

What are key methods for studying these transporters?

Sequence classification via TCDB, functional assays like ion-coupled transport in EmrE (Yerushalmi et al., 1995), and regulation mapping with CRP (Shimada et al., 2011).

What are seminal papers?

Saier et al. (2013, 510 citations) on TCDB; Yerushalmi et al. (1995, 328 citations) on EmrE; He et al. (2009, 350 citations) on SLC superfamily overlaps.

What open problems exist?

Evolutionary links between bacterial ABC/MOP exporters and mammalian peptide transport; therapeutic targeting of multidrug resistance (Hvorup et al., 2003; Konings et al., 2002).