Isolating and Analyzing Protein Containing Granules from Cells

Overview

Journal Curr Protoc

Specialties Biology
Science

Date 2021 Mar 19

PMID 33740275

Citations 2

Authors

Rachel A Victor

Valery F Thompson

Jacob C Schwartz

Affiliations

Soon will be listed here.

Abstract

Recent advancements in detection methods have made protein condensates, also called granules, a major area of study, but tools to characterize these assemblies need continued development to keep up with evolving paradigms. We have optimized a protocol to separate condensates from cells using chemical cross-linking followed by size-exclusion chromatography (SEC). After SEC fractionation, the samples can be characterized by a variety of approaches including enzyme-linked immunosorbent assay, dynamic light scattering, electron microscopy, and mass spectrometry. The protocol described here has been optimized for cultured mammalian cells and E. coli expressing recombinant proteins. Since the lysates are fractionated by size, this protocol can be modified to study other large protein assemblies, including the nuclear pore complex, and for other tissues or organisms. © 2021 Wiley Periodicals LLC. Basic Protocol 1: SEC separation of cross-linked mammalian cell lysates Alternate Protocol: Preparation of non-crosslinked mammalian cells Basic Protocol 2: SEC separation of E. coli lysate Support Protocol 1: Detecting protein of interest by ELISA Support Protocol 2: TCA precipitation of SEC fractions.

Citing Articles

Ewing Sarcoma Related protein 1 recognizes R-loops by binding DNA forks.

Lay M, Thompson V, Adelakun A, Schwartz J Biopolymers. 2024; 115(3):e23576.

PMID: 38511874 PMC: 11127786. DOI: 10.1002/bip.23576.

Ewing Sarcoma Related protein 1 recognizes R-loops by binding DNA forks.

Lay M, Thompson V, Adelakun A, Schwartz J bioRxiv. 2024; .

PMID: 38293191 PMC: 10827230. DOI: 10.1101/2024.01.20.576463.

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