What is the clinical evidence from this study?

Study design: Other. Population: Muscle contraction. Intervention: Muscle activation vs. Relaxed state. Primary outcome: Axial rotation of the myosin light chain domain.

What question did this study set out to answer?

This research aims to investigate the structural changes of myosin during muscle contraction.

March 17, 1998Proceedings of the National Academy of SciencesOpen Access

A large and distinct rotation of the myosin light chain domain occurs upon muscle contraction

View Full Paper

Ask AI

Bookmark

Key result

Muscle activation in scallop fibers caused a substantial change in myosin head orientations, indicating that 17% ± 2% undergo a large axial rotation upon force generation.

Population

scallop muscle fibers

Comparison

muscle activation vs relaxed state

Design

Preclinical

Authors

JBJosh E. BakerGeneral Cardiology IBIngrid Brust‐MascherUniversity of California, Davis SRSampath RamachandranUniversity of Minnesota

Discussion

Member takes

Implication

Does not guide clinical care; leaves open translation of myosin rotations to human cardiac muscle.

Key Points

This research aims to investigate the structural changes of myosin during muscle contraction.
Utilized electron paramagnetic resonance to study myosin in relaxed scallop muscle fibers.
Attached a spin label to a specific site on the light chain domain of myosin.
Measured two distinct orientations of the label to assess structural changes.
Identified a 36 degrees ± 5 degrees axial rotation in myosin light chains, which remains unchanged during activation.
Discovered that 17% ± 2% of myosin heads undergo at least a 30 degrees axial rotation during muscle contraction.
Proposed a model that explains the elusive nature of these structural transitions.

Structured PICO

Population

scallop muscle fibers

Exposure

muscle activation

Comparator

relaxed state

Outcome

orientation of a spin label attached to the light chain domain of myosin

Demonstrates a distinct axial rotation of the myosin light chain domain during muscle contraction using electron paramagnetic resonance, providing insight into motor protein structural transitions.

Cite This Study

Baker et al. (1998) studied Muscle contraction. Muscle activation vs. Relaxed state was evaluated on Axial rotation of the myosin light chain domain. Muscle activation in scallop fibers caused a substantial change in myosin head orientations, indicating that 17% ± 2% undergo a large axial rotation upon force generation.

synapsesocial.com/papers/6a1ff7a617bd4d7ccf04b5d8 https://doi.org/10.1073/pnas.95.6.2944

View Full Paper

Ask AI

Bookmark

A large and distinct rotation of the myosin light chain domain occurs upon muscle contraction

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

A large and distinct rotation of the myosin light chain domain occurs upon muscle contraction

Discussion

Member takes

Implication

Key Points

Structured PICO

Cite This Study

Also Consider

Also Consider