A mycobacterial ABC transporter mediates the uptake of hydrophilic compounds
Abstract
Mycobacterium tuberculosis (Mtb) is an obligate human pathogen and the causative agent of tuberculosis. Although Mtb can synthesize vitamin B12 (cobalamin) de novo, uptake of cobalamin has been linked to pathogenesis of tuberculosis. Mtb does not encode any characterized cobalamin transporter; however, the gene rv1819c was found to be essential for uptake of cobalamin. This result is difficult to reconcile with the original annotation of Rv1819c as a protein implicated in the transport of antimicrobial peptides such as bleomycin. In addition, uptake of cobalamin seems inconsistent with the amino acid sequence, which suggests that Rv1819c has a bacterial ATP-binding cassette (ABC)-exporter fold. In this paper, we present structures of Rv1819c, which reveal that the protein indeed contains the ABC-exporter fold, as well as a large water-filled cavity of about 7,700 Å, which enables the protein to transport the unrelated hydrophilic compounds bleomycin and cobalamin. On the basis of these structures, we propose that Rv1819c is a multi-solute transporter for hydrophilic molecules, analogous to the multidrug exporters of the ABC transporter family, which pump out structurally diverse hydrophobic compounds from cells.
- Authors:
-
- Univ. of Groningen (The Netherlands)
- SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Palo Alto, CA (United States)
- Stockholm Univ. (Sweden)
- Univ. of Groningen (The Netherlands); Moscow Inst. of Physics and Technology, Dolgoprudny (Russia)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- European Molecular Microbiology Organization (EMBO); Netherlands Organization for Scientific Research (NWO); Swedish Research Council (VR); Carl Tryggers Foundation; USDOE Laboratory Directed Research and Development (LDRD) Program
- OSTI Identifier:
- 1616960
- Grant/Contract Number:
- AC02-76SF00515; 714.018.003; 723.014.002
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nature (London)
- Additional Journal Information:
- Journal Name: Nature (London); Journal Volume: 580; Journal Issue: 7803; Journal ID: ISSN 0028-0836
- Publisher:
- Nature Publishing Group
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 59 BASIC BIOLOGICAL SCIENCES; Bacterial structural biology; Cryoelectron microscopy; Membrane proteins
Citation Formats
Rempel, S., Gati, C., Nijland, M., Thangaratnarajah, C., Karyolaimos, A., de Gier, J. W., Guskov, A., and Slotboom, D. J. A mycobacterial ABC transporter mediates the uptake of hydrophilic compounds. United States: N. p., 2020.
Web. doi:10.1038/s41586-020-2072-8.
Rempel, S., Gati, C., Nijland, M., Thangaratnarajah, C., Karyolaimos, A., de Gier, J. W., Guskov, A., & Slotboom, D. J. A mycobacterial ABC transporter mediates the uptake of hydrophilic compounds. United States. https://doi.org/10.1038/s41586-020-2072-8
Rempel, S., Gati, C., Nijland, M., Thangaratnarajah, C., Karyolaimos, A., de Gier, J. W., Guskov, A., and Slotboom, D. J. Wed .
"A mycobacterial ABC transporter mediates the uptake of hydrophilic compounds". United States. https://doi.org/10.1038/s41586-020-2072-8. https://www.osti.gov/servlets/purl/1616960.
@article{osti_1616960,
title = {A mycobacterial ABC transporter mediates the uptake of hydrophilic compounds},
author = {Rempel, S. and Gati, C. and Nijland, M. and Thangaratnarajah, C. and Karyolaimos, A. and de Gier, J. W. and Guskov, A. and Slotboom, D. J.},
abstractNote = {Mycobacterium tuberculosis (Mtb) is an obligate human pathogen and the causative agent of tuberculosis. Although Mtb can synthesize vitamin B12 (cobalamin) de novo, uptake of cobalamin has been linked to pathogenesis of tuberculosis. Mtb does not encode any characterized cobalamin transporter; however, the gene rv1819c was found to be essential for uptake of cobalamin. This result is difficult to reconcile with the original annotation of Rv1819c as a protein implicated in the transport of antimicrobial peptides such as bleomycin. In addition, uptake of cobalamin seems inconsistent with the amino acid sequence, which suggests that Rv1819c has a bacterial ATP-binding cassette (ABC)-exporter fold. In this paper, we present structures of Rv1819c, which reveal that the protein indeed contains the ABC-exporter fold, as well as a large water-filled cavity of about 7,700 Å, which enables the protein to transport the unrelated hydrophilic compounds bleomycin and cobalamin. On the basis of these structures, we propose that Rv1819c is a multi-solute transporter for hydrophilic molecules, analogous to the multidrug exporters of the ABC transporter family, which pump out structurally diverse hydrophobic compounds from cells.},
doi = {10.1038/s41586-020-2072-8},
journal = {Nature (London)},
number = 7803,
volume = 580,
place = {United States},
year = {Wed Mar 25 00:00:00 EDT 2020},
month = {Wed Mar 25 00:00:00 EDT 2020}
}
Web of Science
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