Abstract
This study describes the structure of the putative ABC-type 2 transporter TM0543 from Thermotoga maritima MSB8 determined at a resolution of 2.3 Å. In comparative sequence-clustering analysis, TM0543 displays similarity to NatAB-like proteins, which are components of the ABC-type Na+ efflux pump permease. However, the overall structure fold of the predicted nucleotide-binding domain reveals that it is different from any known structure of ABC-type efflux transporters solved to date. The structure of the putative TM0543 domain also exhibits different dimer architecture and topology of its presumed ATP binding pocket, which may indicate that it does not bind nucleotide at all. Structural analysis of calcium ion binding sites found at the interface between TM0543 dimer subunits suggests that protein may be involved in ion-transporting activity. A detailed analysis of the protein sequence and structure is presented and discussed.
Abbreviations
- TMD:
-
Transmembrane domain
- ATP-BD:
-
Nucleotide-binding domain
- TM:
-
Transmembrane α-helix
- ABC Superfamily:
-
ATP-binding Cassette Superfamily
- TCDB:
-
Transport Classification Database (http://www.tcdb.org/)
- PDB:
-
Protein Data Bank
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Acknowledgments
The work described in this paper was supported by NIH PSI Grants GM74492 and GM094585. The results shown in this report are derived from work performed at Argonne National Laboratory, at the Structural Biology Center of the Advanced Photon Source. Argonne is operated by University of Chicago Argonne, LLC, for the U.S. Department of Energy, Office of Biological and Environmental Research under contract DE-AC02-06CH11357. We would also like to thank Dr Matthew D. Zimmerman for critically reading and correcting the manuscript.
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Ekaterina V. Filippova and Karolina L. Tkaczuk have contributed equally to the project.
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10969_2014_9189_MOESM1_ESM.tif
Multiple sequence alignment. Multiple sequence alignment (MSA) of the full-length sequence of TM0543 from Thermotoga maritima MSB8 and B subtilis NatB (GI 1663528). TM0543 homologs from other bacteria are Capnocytophaga sp. Oral, (326336280), Clostridium acetobutylicum (15896183), Thermotoga neapolitana (222099099), Thermatoga sp. (170288195), T. lettingae (157364685), and Dictyoglomus turgidum (217967947). TM0543 homologs from Archaea and Euryarchaeota are Thermococcus onnurineus (212224498), T. kodakarensis (57641271), Thermococcus sp. (254173813), T. gammatolerans (240103178), T. barophilus (315231269), T. sibiricus (242399363) Pyrococcus abyssi (14520847), P. horikoshii (14591313), and P. furiosus (18976681). Residues with > 70 % sequence similarity or identity are shaded gray; very highly conserved residues secondary structure elements are shown in cartoon representation above the MSA and colored according to the solution type (purple: experimentally solved, blue: modeled TM helices). The locations of the degenerate Walker A and Walker B nucleotide-binding motifs are marked in green above the alignment (TIFF 10425 kb)
10969_2014_9189_MOESM2_ESM.tif
Model structure of the transmembrane binding domain. Ribbon diagram of the putative NatAB-like ABC-type transporter TM0543 from Thermotoga maritima MSB8. The experimentally determined structure of ATP-BD is colored in purple, and the homology-modeled regions of TMD (and parts of ATP-BD) are colored in blue. ATP-BD helices are labeled as α and TMD helices are labeled as TM. (TM1 and TM2 are linker helices). The N- and C-termini are marked in red (TIFF 2890 kb)
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Filippova, E.V., Tkaczuk, K.L., Chruszcz, M. et al. Structural characterization of the putative ABC-type 2 transporter from Thermotoga maritima MSB8. J Struct Funct Genomics 15, 215–222 (2014). https://doi.org/10.1007/s10969-014-9189-7
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DOI: https://doi.org/10.1007/s10969-014-9189-7