Charge-reversion mutagenesis of Dictyostelium actin to map the surface recognized by myosin during ATP-driven sliding motion.
basic_science · Level V
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- Record sourced from PubMed, PMID 8460118.
- Also identified by PMC identifier 46038.
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Abstract
Amino acid residues D24/D25, E99/E100, E360/E361, and D363/E364 in subdomain 1 of Dictyostelium actin were replaced with histidine residues by site-directed mutagenesis. Mutant actins were expressed in Dictyostelium cells and purified to homogeneity. The sliding movement of mutant actin filaments on heavy meromyosin attached to a glass surface was measured to assess the effect of the mutation on the motility of actin. For two C-terminal mutants, force generated by a single actin filament and myosin was also measured. These measurements indicated that both D24/D25 and E99/E100 are involved in ATP-driven sliding, whereas E360/E361/D363/E364 are not essential for ATP-driven sliding and force generation.
Medical subject headings
- Actins
- Adenosine Triphosphate
- Dictyostelium
- Histidine
- Myosins
- Protein Conformation