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Mutations in the major gas vesicle protein GvpA and impacts on gas vesicle formation in Haloferax volcanii.

Knitsch, Regine and Schneefeld, Marie and Weitzel, Kerstin and Pfeifer, Felicitas (2017):
Mutations in the major gas vesicle protein GvpA and impacts on gas vesicle formation in Haloferax volcanii.
106, In: Molecular microbiology, (4), pp. 530-542, ISSN 1365-2958, [Article]

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.

Item Type: Article
Erschienen: 2017
Creators: Knitsch, Regine and Schneefeld, Marie and Weitzel, Kerstin and Pfeifer, Felicitas
Title: Mutations in the major gas vesicle protein GvpA and impacts on gas vesicle formation in Haloferax volcanii.
Language: English
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.

Journal or Publication Title: Molecular microbiology
Volume: 106
Number: 4
Divisions: 10 Department of Biology
10 Department of Biology > Microbiology and Archaea
Date Deposited: 21 Sep 2017 07:05
Identification Number: pmid:28898511
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