What is the clinical evidence from this study?

Study design: Other. Intervention: Mechanical strain vs. Unstrained state. Primary outcome: ATP binding and autophosphorylation.

What question did this study set out to answer?

To determine the conformational changes and structural mechanisms by which mechanical strain activates human titin kinase.

September 2, 2008Proceedings of the National Academy of SciencesOpen Access

Mechanoenzymatics of titin kinase

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Key result

Mechanical strain activates ATP binding and subsequent autophosphorylation of human titin kinase before the unfolding of structural domains, demonstrating its function as a biological force sensor.

Population

Recombinant human titin kinase construct A168-M2 and molecular dynamics simulations

Comparison

Mechanical strain applied via AFM-based… vs Unstrained/autoinhibited titin kinase or titin…

Design

Preclinical

Authors

EPElias M. PuchnerUniversity of Minnesota AAAlexander AlexandrovichKing's College London AKAy Lin KhoHeart Failure / Cardiomyopathy

Discussion

Member takes

Implication

Identifies dual autoinhibition of titin kinase; extends muscle mechanosensing models but leaves cardiac applications open.

Key Points

To determine the conformational changes and structural mechanisms by which mechanical strain activates human titin kinase.
Atomic force microscopy (AFM)-based single-molecule force spectroscopy to measure force-dependent activation.
Molecular dynamics simulations to model conformational transitions under tension.
In vitro enzymatic assays to assess ATP binding, autophosphorylation, and substrate turnover.
Mechanical strain selectively relieves the dual autoinhibition of titin kinase at low forces, removing the C-terminal regulatory tail to allow cosubstrate ATP binding.
Activation of ATP binding occurs prior to the unfolding of adjacent structural titin domains, establishing titin kinase as a functional force sensor.

Structured PICO

Population

Recombinant human titin kinase construct A168-M2 (expressed in sf9 insect cells) and molecular dynamics simulations

Intervention

Mechanical strain applied via AFM-based single-molecule force spectroscopy and force-probe molecular dynamics simulations

Comparator

Unstrained/autoinhibited titin kinase or titin kinase in the absence of ATP

Outcome

Conformational changes, ATP binding kinetics, and autophosphorylation of titin kinasesurrogate

Mechanical strain directly activates titin kinase by opening its ATP binding site and triggering autophosphorylation, providing a molecular mechanism for mechanical strain sensing in muscle.

Limitations

The complex protein composition of the sarcomere M-band precludes an unequivocal experimental answer in vivo, necessitating isolated single-molecule studies.

Cite This Study

Puchner et al. (2008) studied this question. Mechanical strain vs. Unstrained state was evaluated on ATP binding and autophosphorylation. Mechanical strain activates ATP binding and subsequent autophosphorylation of human titin kinase before the unfolding of structural domains, demonstrating its function as a biological force sensor.

synapsesocial.com/papers/6a6c8ea635aa2c282cdf96fd https://doi.org/10.1073/pnas.0805034105

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Mechanoenzymatics of titin kinase

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Mechanoenzymatics of titin kinase

Discussion

Member takes

Implication

Key Points

Structured PICO

Limitations

Cite This Study

Also Consider

Also Consider