The flexibility of actin filaments as revealed by fluorescence resonance energy transfer. The influence of divalent cations

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Abstract

The temperature profile of the fluorescence resonance energy transfer efficiency normalized by the fluorescence quantum yield of the donor in the presence of acceptor, f, was measured in a way allowing the independent investigation of (i) the strength of interaction between the adjacent protomers (intermonomer flexibility) and (ii) the flexibility of the protein matrix within actin protomers (intramonomer flexibility). In both cases the relative increase as a function of temperature in f is larger in calcium-F- actin than in magnesium-F-actin in the range of 5-40 °C, which indicates that both the intramonomer and the intermonomer flexibility of the actin filaments are larger in calcium-F-actin than those in magnesium-F-actin. The intermonomer flexibility was proved to be larger than the intramonomer one in both the calcium-F-actin and the magnesium-F-actin. The distance between Gin41 and Cys374 residues was found to be cation-independent and did not change during polymerization at 21 °C. The steady-state fluorescence anisotropy data of fluorophores attached to the Gln41 or Cys374 residues suggest that the microenvironments around these regions are more rigid in the magnesium-loaded actin filament than in the calcium-loaded form.

Original languageEnglish
Pages (from-to)12996-13001
Number of pages6
JournalJournal of Biological Chemistry
Volume274
Issue number19
DOIs
Publication statusPublished - May 7 1999

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Fluorescence Resonance Energy Transfer
Divalent Cations
Actin Cytoskeleton
Actins
Magnesium
Calcium
Protein Subunits
Temperature
Fluorescence Polarization
Fluorescence
Polymerization
Fluorophores
Cations
Quantum yield
Anisotropy

ASJC Scopus subject areas

  • Biochemistry

Cite this

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title = "The flexibility of actin filaments as revealed by fluorescence resonance energy transfer. The influence of divalent cations",
abstract = "The temperature profile of the fluorescence resonance energy transfer efficiency normalized by the fluorescence quantum yield of the donor in the presence of acceptor, f, was measured in a way allowing the independent investigation of (i) the strength of interaction between the adjacent protomers (intermonomer flexibility) and (ii) the flexibility of the protein matrix within actin protomers (intramonomer flexibility). In both cases the relative increase as a function of temperature in f is larger in calcium-F- actin than in magnesium-F-actin in the range of 5-40 °C, which indicates that both the intramonomer and the intermonomer flexibility of the actin filaments are larger in calcium-F-actin than those in magnesium-F-actin. The intermonomer flexibility was proved to be larger than the intramonomer one in both the calcium-F-actin and the magnesium-F-actin. The distance between Gin41 and Cys374 residues was found to be cation-independent and did not change during polymerization at 21 °C. The steady-state fluorescence anisotropy data of fluorophores attached to the Gln41 or Cys374 residues suggest that the microenvironments around these regions are more rigid in the magnesium-loaded actin filament than in the calcium-loaded form.",
author = "M. Nyitrai and G. Hild and J. Bel{\'a}gyi and B. Somogyi",
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AU - Nyitrai, M.

AU - Hild, G.

AU - Belágyi, J.

AU - Somogyi, B.

PY - 1999/5/7

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N2 - The temperature profile of the fluorescence resonance energy transfer efficiency normalized by the fluorescence quantum yield of the donor in the presence of acceptor, f, was measured in a way allowing the independent investigation of (i) the strength of interaction between the adjacent protomers (intermonomer flexibility) and (ii) the flexibility of the protein matrix within actin protomers (intramonomer flexibility). In both cases the relative increase as a function of temperature in f is larger in calcium-F- actin than in magnesium-F-actin in the range of 5-40 °C, which indicates that both the intramonomer and the intermonomer flexibility of the actin filaments are larger in calcium-F-actin than those in magnesium-F-actin. The intermonomer flexibility was proved to be larger than the intramonomer one in both the calcium-F-actin and the magnesium-F-actin. The distance between Gin41 and Cys374 residues was found to be cation-independent and did not change during polymerization at 21 °C. The steady-state fluorescence anisotropy data of fluorophores attached to the Gln41 or Cys374 residues suggest that the microenvironments around these regions are more rigid in the magnesium-loaded actin filament than in the calcium-loaded form.

AB - The temperature profile of the fluorescence resonance energy transfer efficiency normalized by the fluorescence quantum yield of the donor in the presence of acceptor, f, was measured in a way allowing the independent investigation of (i) the strength of interaction between the adjacent protomers (intermonomer flexibility) and (ii) the flexibility of the protein matrix within actin protomers (intramonomer flexibility). In both cases the relative increase as a function of temperature in f is larger in calcium-F- actin than in magnesium-F-actin in the range of 5-40 °C, which indicates that both the intramonomer and the intermonomer flexibility of the actin filaments are larger in calcium-F-actin than those in magnesium-F-actin. The intermonomer flexibility was proved to be larger than the intramonomer one in both the calcium-F-actin and the magnesium-F-actin. The distance between Gin41 and Cys374 residues was found to be cation-independent and did not change during polymerization at 21 °C. The steady-state fluorescence anisotropy data of fluorophores attached to the Gln41 or Cys374 residues suggest that the microenvironments around these regions are more rigid in the magnesium-loaded actin filament than in the calcium-loaded form.

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