Dataset Information

In situ muGISAXS: II. Thaumatin crystal growth kinetic.

ABSTRACT: The formation of thaumatin crystals by Langmuir-Blodgett (LB) film nanotemplates was studied by the hanging-drop technique in a flow-through cell by synchrotron radiation micrograzing-incidence small-angle x-ray scattering. The kinetics of crystallization was measured directly on the interface of the LB film crystallization nanotemplate. The evolution of the micrograzing-incidence small-angle x-ray scattering patterns suggests that the increase in intensity in the Yoneda region is due to protein incorporation into the LB film. The intensity variation suggests several steps, which were modeled by system dynamics based on first-order differential equations. The kinetic data can be described by two processes that take place on the LB film, a first, fast, process, attributed to the crystal growth and its detachment from the LB film, and a second, slower process, attributed to an unordered association and conversion of protein on the LB film.

SUBMITTER: Gebhardt R

PROVIDER: S-EPMC2920630 | biostudies-literature | 2010 Aug

REPOSITORIES: biostudies-literature

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In situ muGISAXS: II. Thaumatin crystal growth kinetic.

Gebhardt Ronald R Pechkova Eugenia E Riekel Christian C Nicolini Claudio C

Biophysical journal 20100801 4

The formation of thaumatin crystals by Langmuir-Blodgett (LB) film nanotemplates was studied by the hanging-drop technique in a flow-through cell by synchrotron radiation micrograzing-incidence small-angle x-ray scattering. The kinetics of crystallization was measured directly on the interface of the LB film crystallization nanotemplate. The evolution of the micrograzing-incidence small-angle x-ray scattering patterns suggests that the increase in intensity in the Yoneda region is due to protein ...[more]

PMID: 20713011

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Project description:Calcium oxalate raphide crystals are found in bundles in intravacuolar membrane chambers of specialized idioblasts cells of most plant families including many crop plants and are found in most tissues. Raphides are needle-shaped, often with barbed ends, and their morphology and biomineralization pattern have been a focus of much research. In the family Araceae, raphides have been proposed to cause acridity in crops such as taro (Colocasia esculenta (L.) Schott). Acridity is irritation that causes swelling of lips, mouth and throat, as well as itchiness and pain when raw or insufficiently cooked tissues are eaten; this response varies among taro consumers. Since raphides in some other foods do not cause acridity, and since acridity can be inactivated by cooking and/or protease treatment, it is possible that a toxin or allergen-like compound is associated with the crystals. Using two-dimensional (2D) gel electrophoresis and mass spectrometry (MS) peptide sequencing of selected peptides from purified raphides and the results from taro apex transcriptome sequencing, we have shown that profilins, known allergens, are present on raphides. One of the five raphide profilins genes was highly expressed in the apex and had a 17-amino-acid insert that significantly increased that profilin’s epitope peak. This insert was predicted to be coiled and exposed on the surface of the folded peptide. A second profilin had a 2-amino-acid insert that also had a greater B-cell epitope prediction. The taro profilins showed 83 to 92% similarity to known characterized profilins while other raphide peptides showed greater than 90% similarity to other higher plants. The presence on the raphides of peptides normally associated with mitochrondria (ATP synthase), chloroplasts (chaperonin cpn 60 kDa), cytoplasm (actin, profilin) and vacuole (V-type ATPase) indicates a multistage biocrystallation process ending with possible invagination of the tonoplast and addition of mucilage that may be derived from the Golgi. Actin might play a crucial role in the generation of the needle-like raphides. We also showed that commercial allergen test strips for hazelnuts, where profilin is a secondary allergen, have potential for screening in a plant breeding program to reduce acridity and during food processing to avoid over-cooking.

Dataset Information

In situ muGISAXS: II. Thaumatin crystal growth kinetic.

Publications

In situ muGISAXS: II. Thaumatin crystal growth kinetic.

Similar Datasets

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