Dataset Information

Purification, crystallization and preliminary X-ray diffraction analysis of ArsH from Synechocystis sp. strain PCC 6803.

ABSTRACT: ArsH is an NADPH-dependent flavin mononucleotide reductase and is frequently encoded as part of an ars operon. The function of the arsH gene remains to be characterized. Crystallization and structural studies may contribute to elucidating the specific biological function of ArsH associated with arsenic resistance. ArsH from Synechocystis sp. strain PCC 6803 was overproduced, purified and crystallized. Crystals were obtained by the sitting-drop vapour-diffusion method. Diffraction data were collected and processed to a resolution of 1.6?Å. The crystals belonged to the tetragonal space group I4122, with unit-cell parameters a = b = 127.94, c = 65.86?Å and one molecule in the asymmetric unit. Size-exclusion chromatography and molecular-replacement results showed that the ArsH formed a tetramer. Further structural analysis and comparison with ArsH from Sinorhizobium meliloti will provide information about the oligomerization of ArsH.

SUBMITTER: Zhang X

PROVIDER: S-EPMC3976072 | biostudies-literature | 2014 Apr

REPOSITORIES: biostudies-literature

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Publications

Purification, crystallization and preliminary X-ray diffraction analysis of ArsH from Synechocystis sp. strain PCC 6803.

Zhang Xiao X Xue Xi-Mei XM Yan Yu Y Ye Jun J

Acta crystallographica. Section F, Structural biology communications 20140325 Pt 4

ArsH is an NADPH-dependent flavin mononucleotide reductase and is frequently encoded as part of an ars operon. The function of the arsH gene remains to be characterized. Crystallization and structural studies may contribute to elucidating the specific biological function of ArsH associated with arsenic resistance. ArsH from Synechocystis sp. strain PCC 6803 was overproduced, purified and crystallized. Crystals were obtained by the sitting-drop vapour-diffusion method. Diffraction data were colle ...[more]

PMID: 24699748

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Project description:In recent years, there has been an increased interest in the research and development of sustainable alternatives to fossil fuels. Using photosynthetic microorganisms to produce such alternatives is advantageous, since they can achieve direct conversion of carbon dioxide from the atmosphere into the desired product, using sunlight as the energy source. Squalene is a naturally occurring 30-carbon isoprenoid, which has commercial use in cosmetics and in vaccines. If it could be produced sustainably on a large scale, it could also be used instead of petroleum as a raw material for fuels and as feedstock for the chemical industry. The unicellular cyanobacterium Synechocystis PCC 6803 possesses a gene, slr2089, predicted to encode squalene hopene cyclase (Shc), an enzyme converting squalene into hopene, the substrate for forming hopanoids. Through inactivation of slr2089 (shc), we explored the possibility to produce squalene using cyanobacteria. The inactivation led to accumulation of squalene, to a level over 70 times higher than in wild type cells, reaching 0.67 mg OD750(-1) L(-1). We did not observe any significant growth deficiency in the Δshc strain compared to the wild type Synechocystis, even at high light conditions, suggesting that the observed squalene accumulation was not detrimental to growth, and that formation of hopene by Shc is not crucial for growth under normal conditions, nor for high-light stress tolerance. Effects of different light intensities and growth stages on squalene accumulation in the Δshc strain were investigated. We also identified a gene, sll0513, as a putative squalene synthase in Synechocystis, and verified its function by inactivation. In this work, we show that it is possible to use the cyanobacterium Synechocystis to generate squalene, a hydrocarbon of commercial interest and a potential biofuel. We also report the first identification of a squalene hopene cyclase, and the second identification of squalene synthase, in cyanobacteria.

Dataset Information

Purification, crystallization and preliminary X-ray diffraction analysis of ArsH from Synechocystis sp. strain PCC 6803.

Publications

Purification, crystallization and preliminary X-ray diffraction analysis of ArsH from Synechocystis sp. strain PCC 6803.

Similar Datasets

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