Knitsch, Regine ; Schneefeld, Marie ; Weitzel, Kerstin ; Pfeifer, Felicitas (2017)
Mutations in the major gas vesicle protein GvpA and impacts on gas vesicle formation in Haloferax volcanii.
In: Molecular microbiology, 106 (4)
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Gas vesicles are proteinaceous, gas-filled nanostructures produced by some bacteria and archaea. The hydrophobic major structural protein GvpA forms the ribbed gas vesicle wall. An in-silico 3D-model of GvpA of the predicted coil-α1-β1-β2-α2-coil structure is available and implies that the two β-chains constitute the hydrophobic interior surface of the gas vesicle wall. To test the importance of individual amino acids in GvpA we performed 85 single substitutions and analysed these variants in Haloferax volcanii ΔA+Amut transformants for their ability to form gas vesicles (Vac(+) phenotype). In most cases, an alanine substitution of a nonpolar residue did not abolish gas vesicle formation, but the replacement of single non-polar by charged residues in β1 or β2 resulted in Vac(-) transformants. A replacement of residues near the β-turn altered the spindle-shape to a cylindrical morphology of the gas vesicles. Vac(-) transformants were also obtained with alanine substitutions of charged residues of helix α1 suggesting that these amino acids form salt-bridges with another GvpA monomer. In helix α2, only the alanine substitution of His53, or Tyr54, led to Vac(-) transformants, whereas most other substitutions had no effect. We discuss our results in respect to the GvpA structure and data available from solid-state NMR. This article is protected by copyright. All rights reserved.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2017 |
| Autor(en): | Knitsch, Regine ; Schneefeld, Marie ; Weitzel, Kerstin ; Pfeifer, Felicitas |
| Art des Eintrags: | Bibliographie |
| Titel: | Mutations in the major gas vesicle protein GvpA and impacts on gas vesicle formation in Haloferax volcanii. |
| Sprache: | Englisch |
| Publikationsjahr: | November 2017 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Molecular microbiology |
| Jahrgang/Volume einer Zeitschrift: | 106 |
| (Heft-)Nummer: | 4 |
| Kurzbeschreibung (Abstract): | Gas vesicles are proteinaceous, gas-filled nanostructures produced by some bacteria and archaea. The hydrophobic major structural protein GvpA forms the ribbed gas vesicle wall. An in-silico 3D-model of GvpA of the predicted coil-α1-β1-β2-α2-coil structure is available and implies that the two β-chains constitute the hydrophobic interior surface of the gas vesicle wall. To test the importance of individual amino acids in GvpA we performed 85 single substitutions and analysed these variants in Haloferax volcanii ΔA+Amut transformants for their ability to form gas vesicles (Vac(+) phenotype). In most cases, an alanine substitution of a nonpolar residue did not abolish gas vesicle formation, but the replacement of single non-polar by charged residues in β1 or β2 resulted in Vac(-) transformants. A replacement of residues near the β-turn altered the spindle-shape to a cylindrical morphology of the gas vesicles. Vac(-) transformants were also obtained with alanine substitutions of charged residues of helix α1 suggesting that these amino acids form salt-bridges with another GvpA monomer. In helix α2, only the alanine substitution of His53, or Tyr54, led to Vac(-) transformants, whereas most other substitutions had no effect. We discuss our results in respect to the GvpA structure and data available from solid-state NMR. This article is protected by copyright. All rights reserved. |
| ID-Nummer: | pmid:28898511 |
| Fachbereich(e)/-gebiet(e): | 10 Fachbereich Biologie 10 Fachbereich Biologie > Microbiology and Archaea |
| Hinterlegungsdatum: | 21 Sep 2017 07:05 |
| Letzte Änderung: | 03 Jan 2018 10:31 |
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