Protein Partitioning
Protein Partitioning - Related Videos
11:11
Determination of Plasma Membrane Partitioning for Peripherally-associated Proteins
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Cited by 5 •
2018
Here, we present a protocol to perform a quantitative analysis of the level of plasma-membrane association for fluorescently-tagged peripherally-associated protein. The method is based on the computational decomposition of membrane and cytoplasmic component of signal observed in cells labeled with plasma membrane fluorescent marker.
01:14
Extraction: Partition and Distribution Coefficients
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2024
The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium. For extracting a solute from an aqueous phase into an organic...
10:59
Determination of Lipid Raft Partitioning of Fluorescently-tagged Probes in Living Cells by Fluorescence Correlation Spectroscopy (FCS)
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Cited by 9 •
2012
A technique to probe the lipid raft partitioning of fluorescent proteins at the plasma membrane of living cells is described. It takes advantage of the disparity in diffusion times of proteins located inside or outside of lipid rafts. Acquisition can be performed dynamically in control conditions or after drug addition.
08:46
Green Fluorescent Protein-based Expression Screening of Membrane Proteins in Escherichia coli
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Cited by 34 •
2015
A streamlined approach to screening for the expression of recombinant membrane proteins in Escherichia coli based on fusion to green fluorescent protein is presented.
11:50
Metal-silicate Partitioning at High Pressure and Temperature: Experimental Methods and a Protocol to Suppress Highly Siderophile Element Inclusions
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Cited by 5 •
2015
We present a procedure to determine the metal-silicate partitioning of siderophile elements, emphasizing techniques that suppress the formation of metal inclusions in experiments for the noble metals. The results of these experiments are used to demonstrate the effect of core-formation on the highly siderophile element composition of the mantle.
FAQs
Protein partitioning responds to several properties at once. Differences in net charge alter electrostatic compatibility with surrounding phases, whereas hydrophobicity favors environments that accommodate nonpolar surfaces. Solvent compatibility, molecular crowding, and binding interactions further shift the balance. Because these variables can change with the chemical environment, partition behavior helps assess how conditions may redistribute proteins and influence their functional location.
Molecular crowding and binding interactions can make one environment more favorable than another for particular proteins. When these forces act together with charge, hydrophobicity, and solvent compatibility, they may drive selective liquid-liquid phase separation. This behavior matters because it can concentrate proteins into distinct liquid phases, providing clues about interaction networks and responses to changing biochemical conditions.
Cellular compartment partitioning concerns where proteins are distributed within the organization of a cell, while chemical-phase partitioning concerns their preference for different solvent or liquid environments. Both depend on properties such as charge, hydrophobicity, crowding, and binding. Comparing the two perspectives connects protein localization with experimentally controllable separation systems used in biochemical analysis and purification.
Researchers can measure partitioning by examining how a protein distributes among cellular compartments, liquid phases, or chemical environments. Interpreting that distribution can reveal protein interactions, structural properties, and responses to environmental changes. The resulting measurements also help determine whether a separation system favors selective enrichment, supports analysis of biomolecular condensates, or reflects altered biochemical conditions.
In purification and extraction, partitioning provides a basis for separating proteins according to differences in charge, hydrophobicity, solvent compatibility, crowding, or binding interactions. A protein that favors one environment can become enriched relative to others, supporting isolation from a mixture. These principles help guide the design of biochemical separation methods without requiring every protein to behave identically.
Protein partitioning supports subcellular localization studies, protein purification, extraction, and analysis of biomolecular condensates. In localization research, distribution patterns help indicate where proteins function. In condensate studies, partition behavior can reveal interaction and structural features. The same knowledge also informs engineered biological systems, where controlling protein distribution may help shape system organization or environmental responses.