Electrophoretic Mobility Shift Assay of in vitro Phosphorylated RNA Polymerase II Carboxyl-terminal Domain Substrates.
Bio Protoc
; 10(12): e3648, 2020 Jun 20.
Article
in En
| MEDLINE
| ID: mdl-33659319
ABSTRACT
Eukaryotic RNA polymerase II transcribes all protein-coding mRNAs and is highly regulated. A key mechanism directing RNA polymerase II and facilitating the co-transcriptional processing of mRNAs is the phosphorylation of its highly repetitive carboxyl-terminal domain (CTD) of its largest subunit, RPB1, at specific residues. A variety of techniques exist to identify and quantify the degree of CTD phosphorylation, including phosphorylation-specific antibodies and mass spectrometry. Electrophoretic mobility shift assays (EMSAs) have been utilized since the discovery of CTD phosphorylation and continue to represent a simple, direct, and widely applicable approach for qualitatively monitoring CTD phosphorylation. We present a standardized method for EMSA analysis of recombinant GST-CTD substrates phosphorylated by a variety of CTD kinases. Strategies to analyze samples under both denatured/reduced and semi-native conditions are provided. This method represents a simple, direct, and reproducible means to monitor CTD phosphorylation in recombinant substrates utilizing equipment common to molecular biology labs and readily applicable to downstream analyses including immunoblotting and mass spectrometry.
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Language:
En
Journal:
Bio Protoc
Year:
2020
Document type:
Article
Affiliation country:
United States