Structural and biochemical characterization of a novel ZntB (CmaX) transporter protein from Pseudomonas aeruginosa

Artem Stetsenko, Pavlo Stehantsev, Natalia O Dranenko, Mikhail S Gelfand, Albert Guskov*

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
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The 2-TM-GxN family of membrane proteins is widespread in prokaryotes and plays an important role in transport of divalent cations. The canonical signature motif, which is also a selectivity filter, has a composition of Gly-Met-Asn. Some members though deviate from this composition, however no data are available as to whether this has any functional implications. Here we report the functional and structural analysis of CmaX protein from a pathogenic Pseudomonas aeruginosa bacterium, which has a Gly-Ile-Asn signature motif. CmaX readily transports Zn2+, Mg2+, Cd2+, Ni2+ and Co2+ ions, but it does not utilize proton-symport as does ZntB from Escherichia coli. Together with the bioinformatics analysis, our data suggest that deviations from the canonical signature motif do not reveal any changes in substrate selectivity or transport and easily alter in course of evolution.
Original languageEnglish
Pages (from-to)760-767
Number of pages8
JournalInternational Journal of Biological Macromolecules
Early online date24-Jun-2021
Publication statusPublished - 1-Aug-2021


  • Membrane proteins
  • Magnesium transport
  • CorA proteins
  • Structural biology

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