Imaging of thermal activation of actomyosin motors

Hirokazu Kato, Takayuki Nishizaka, Takashi Iga, Kazuhiko Kinosita, Shin'ichi Ishiwata

Research output: Contribution to journalArticle

56 Citations (Scopus)

Abstract

We have developed temperature-pulse microscopy in which the temperature of a microscopic sample is raised reversibly in a square-wave fashion with rise and fall times of several ms, and locally in a region of approximately 10 μm in diameter with a temperature gradient up to 2°C/μm. Temperature distribution was imaged pixel by pixel by image processing of the fluorescence intensity of rhodamine phalloidin attached to (single) actin filaments. With short pulses, actomyosin motors could be activated above physiological temperatures (higher than 60°C at the peak) before thermally induced protein damage began to occur. When a sliding actin filament was heated to 40-45°C, the sliding velocity reached 30 μm/s at 25 mM KCl and 50 μm/s at 50 mM KCl, the highest velocities reported for skeletal myosin in usual in vitro assay systems. Both the sliding velocity and force increased by an order of magnitude when heated from 18°C to 40-45°C. Temperature- pulse microscopy is expected to be useful for studies of biomolecules and cells requiring temporal and/or spatial thermal modulation.

Original languageEnglish
Pages (from-to)9602-9606
Number of pages5
JournalProceedings of the National Academy of Sciences of the United States of America
Volume96
Issue number17
DOIs
Publication statusPublished - 1999 Aug 17
Externally publishedYes

Fingerprint

Actomyosin
Hot Temperature
Temperature
Actin Cytoskeleton
Microscopy
Myosins
Fluorescence
Proteins

ASJC Scopus subject areas

  • Genetics
  • General

Cite this

Imaging of thermal activation of actomyosin motors. / Kato, Hirokazu; Nishizaka, Takayuki; Iga, Takashi; Kinosita, Kazuhiko; Ishiwata, Shin'ichi.

In: Proceedings of the National Academy of Sciences of the United States of America, Vol. 96, No. 17, 17.08.1999, p. 9602-9606.

Research output: Contribution to journalArticle

Kato, Hirokazu ; Nishizaka, Takayuki ; Iga, Takashi ; Kinosita, Kazuhiko ; Ishiwata, Shin'ichi. / Imaging of thermal activation of actomyosin motors. In: Proceedings of the National Academy of Sciences of the United States of America. 1999 ; Vol. 96, No. 17. pp. 9602-9606.
@article{8021e929b9364908b38e32b611d66e30,
title = "Imaging of thermal activation of actomyosin motors",
abstract = "We have developed temperature-pulse microscopy in which the temperature of a microscopic sample is raised reversibly in a square-wave fashion with rise and fall times of several ms, and locally in a region of approximately 10 μm in diameter with a temperature gradient up to 2°C/μm. Temperature distribution was imaged pixel by pixel by image processing of the fluorescence intensity of rhodamine phalloidin attached to (single) actin filaments. With short pulses, actomyosin motors could be activated above physiological temperatures (higher than 60°C at the peak) before thermally induced protein damage began to occur. When a sliding actin filament was heated to 40-45°C, the sliding velocity reached 30 μm/s at 25 mM KCl and 50 μm/s at 50 mM KCl, the highest velocities reported for skeletal myosin in usual in vitro assay systems. Both the sliding velocity and force increased by an order of magnitude when heated from 18°C to 40-45°C. Temperature- pulse microscopy is expected to be useful for studies of biomolecules and cells requiring temporal and/or spatial thermal modulation.",
author = "Hirokazu Kato and Takayuki Nishizaka and Takashi Iga and Kazuhiko Kinosita and Shin'ichi Ishiwata",
year = "1999",
month = "8",
day = "17",
doi = "10.1073/pnas.96.17.9602",
language = "English",
volume = "96",
pages = "9602--9606",
journal = "Proceedings of the National Academy of Sciences of the United States of America",
issn = "0027-8424",
number = "17",

}

TY - JOUR

T1 - Imaging of thermal activation of actomyosin motors

AU - Kato, Hirokazu

AU - Nishizaka, Takayuki

AU - Iga, Takashi

AU - Kinosita, Kazuhiko

AU - Ishiwata, Shin'ichi

PY - 1999/8/17

Y1 - 1999/8/17

N2 - We have developed temperature-pulse microscopy in which the temperature of a microscopic sample is raised reversibly in a square-wave fashion with rise and fall times of several ms, and locally in a region of approximately 10 μm in diameter with a temperature gradient up to 2°C/μm. Temperature distribution was imaged pixel by pixel by image processing of the fluorescence intensity of rhodamine phalloidin attached to (single) actin filaments. With short pulses, actomyosin motors could be activated above physiological temperatures (higher than 60°C at the peak) before thermally induced protein damage began to occur. When a sliding actin filament was heated to 40-45°C, the sliding velocity reached 30 μm/s at 25 mM KCl and 50 μm/s at 50 mM KCl, the highest velocities reported for skeletal myosin in usual in vitro assay systems. Both the sliding velocity and force increased by an order of magnitude when heated from 18°C to 40-45°C. Temperature- pulse microscopy is expected to be useful for studies of biomolecules and cells requiring temporal and/or spatial thermal modulation.

AB - We have developed temperature-pulse microscopy in which the temperature of a microscopic sample is raised reversibly in a square-wave fashion with rise and fall times of several ms, and locally in a region of approximately 10 μm in diameter with a temperature gradient up to 2°C/μm. Temperature distribution was imaged pixel by pixel by image processing of the fluorescence intensity of rhodamine phalloidin attached to (single) actin filaments. With short pulses, actomyosin motors could be activated above physiological temperatures (higher than 60°C at the peak) before thermally induced protein damage began to occur. When a sliding actin filament was heated to 40-45°C, the sliding velocity reached 30 μm/s at 25 mM KCl and 50 μm/s at 50 mM KCl, the highest velocities reported for skeletal myosin in usual in vitro assay systems. Both the sliding velocity and force increased by an order of magnitude when heated from 18°C to 40-45°C. Temperature- pulse microscopy is expected to be useful for studies of biomolecules and cells requiring temporal and/or spatial thermal modulation.

UR - http://www.scopus.com/inward/record.url?scp=0033578371&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0033578371&partnerID=8YFLogxK

U2 - 10.1073/pnas.96.17.9602

DO - 10.1073/pnas.96.17.9602

M3 - Article

C2 - 10449739

AN - SCOPUS:0033578371

VL - 96

SP - 9602

EP - 9606

JO - Proceedings of the National Academy of Sciences of the United States of America

JF - Proceedings of the National Academy of Sciences of the United States of America

SN - 0027-8424

IS - 17

ER -