Two-dimensional gel electrophoresis of actin-binding proteins isolated by affinity chromatography from human skeletal muscle

Author(s)
Coumans-Moens, Joelle
Humphery-Smith, Ian
dos Remedios, Cristobal G
Publication Date
1997
Abstract
In muscle cells actin exists as a mixture of monomeric (G-actin) and filamentous actin (F-actin) and ionic conditions strongly favor the formation of F-actin. The existence of unpolymerized actin depends, among other factors, on proteins that bind to G-actin, the so-called G-actin-binding proteins (G-ABPs). We have coupled monomeric actin to divinylsulphone-activated agarose (Mini-Leak) to isolate G-ABPs in human skeletal muscle. Eluted proteins were analyzed by two‐dimensional gel electrophoresis (2-DE), which shows that some proteins are selectively retained. Deoxyribonuclease I (DNase I) is known to bind residues at the "pointed end" of actin (subdomains 2 and 4) with a high affinity. When DNase I is bound to the actin Mini‐Leak before applying the skeletal muscle extract, the 2-DE gels of the eluted proteins reveals differences when compared to gels of proteins eluted from actin-Mini-Leak and DNase I-Mini‐Leak affinity columns. This strategy should detect ABPs which bind to sites other than the DNase I-binding site and some may prove to be novel.
Citation
Electrophoresis, 18(7), p. 1079-1085
ISSN
1522-2683
0173-0835
Link
Publisher
Wiley-VCH Verlag GmbH & Co KGaA
Title
Two-dimensional gel electrophoresis of actin-binding proteins isolated by affinity chromatography from human skeletal muscle
Type of document
Journal Article
Entity Type
Publication

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