Methods for producing a protein extract from cells, such as cells containing viral proteins, are provided. In general terms, the methods involve: increasing the pH of the cells to a pH of at least about pH 10.0 to produce an intermediate composition, and then, in the presence of a non-ionic detergent, neutralizing the pH of the intermediate composition to produce the protein extract. Kits and compositions for practicing the subject methods are also provided.

Methods of recovering plant-derived proteins or suprastructure proteins, are provided. The method may comprise obtaining a plant, or plant matter comprising apoplast-localized proteins, or suprastructure proteins, loosening the cell wall to produce a plant or plant matter having a loosened cell wall, thus allowing the release of apoplastic content through the cell wall to produce an apoplastic content fraction from the plant or plant matter, and recovering the apoplastic content fraction. The apoplastic content fraction comprises plant-derived proteins or suprastructure proteins.

This invention is in the field of micro-organism and algal cell processing. The invention relates to a method of maximizing migration of micro-organism and/or algal cells to a solvent fraction while simultaneously displacing water in a separate fraction and subsequent extraction of hydrophobic products from the organisms. The invention further relates to a method of sequestration of protein from an aqueous phase to an organic solvent.

Processes for preparing and purifying protein from plant material, and compositions and uses comprising the same, are provided.

The present invention relates to a polypeptide, a process for the production thereof and a use thereof. The polypeptide of the present invention has excellent adhesion effect and is highly stable in an aqueous solution. Endotoxins can be more easily removed from the product of the polypeptide.

Aspects of the disclosure relate to compositions and methods for expressing glycan binding proteins (GBPs) in a cell or cells. In some embodiments, the disclosure provides recombinant Ab-Y3 protein variants and isolated nucleic acids engineered to express the same. In some embodiments, the disclosure provides methods of isolating, purifying, detecting, or screening for certain proteins (e.g., IgG proteins) using recombinant Ab-Y3 protein variants.

A newly developed butane-tetraol-based amphiphilic compound, a method of preparing the same, and a method of extracting, solubilizing, stabilizing, crystallizing or analyzing a membrane protein using the amphiphilic compound are provided. The butane-tetraol-based compound is found to have a central structure exhibiting chirality, and isomers of the compound have clearly different characteristics according to the stereochemistry of the central structure, thereby making it possible to select compounds suitable for the uses thereof. Also, the compound can be used to effectively extract a membrane protein, which has more various structures and characteristics than conventional compounds, from cell membranes and stably store the membrane protein in an aqueous solution for a long time, and thus analyze the function and structure of the membrane protein. The analysis of the structure and function of the membrane protein is one of the fields which have received the most attention in biology and chemistry since the analysis of the structure and function of the membrane protein is closely associated with the development of new drugs.

This paper describes a concentrated sweet potato leaf protein in dried form, along with methods for producing it. The concentrated leaf protein is high in protein content, high in purity, and can have other beneficial components such as polyphenols. The concentrated leaf proteins are suitable for use in food and beverages, as protein supplementation, or as agents for gelling, foaming, whipping and the like.

The present invention provides methods for the fractionation of low molecular weight proteins from mixed protein populations, and proteins obtained by said methods. The methods described herein may find application in, but are not limited to, the detection and/or quantitation of low abundance and/or low molecular weight proteins in biological samples.

The invention relates to a method for the treatment of body fluid proteins, by which proteins from body fluids such as blood or urine are extracted by adding a certain proportion of high molecular polymer solution under low temperature condition followed by denaturation and reduction by adding a certain concentration of surfactant and tris(2-carboxyethyl) phosphine (TCEP) under a high temperature condition. Subsequently, the iodoacetic acid brushes grafted on silica microspheres called as solid-phase alkylation reagents are added into protein solution, which can react rapidly with the protein sulfhydryl group. After centrifugation, the microspheres are obtained and repeatedly washed with methanol and buffer to remove interferences such as sugars, salts, surfactants, lipids to obtain high-purity proteins, and finally protease is added to digest proteins into peptides. After centrifugation, the peptide products are obtained, and directly analyzed by liquid chromatography-mass spectrometry (LC-MS) system. Compared with the traditional protein pretreatment method, the method has many advantages such as good anti-interference capability, easy operation and short pretreatment time.