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Molecular Mechanisms Lab

Mechanism is a causal connection.

Change a molecular state, make a prediction before the reveal, inspect the evidence boundary, challenge the interpretation and choose the experiment that would discriminate mechanism from artefact.

Module 01 · ALC1

PAR releases autoinhibition.

Primary source: Singh HR et al., Molecular Cell (2017). Single first author. The state diagram is explanatory; publication-backed F2H evidence is a separate evidence layer.

Question

How does PAR convert ALC1 from an autoinhibited molecular state into an active chromatin-remodelling state?

Manipulate · PAR state
Predict before reveal
Challenge · choose the ambiguity to resolve
Decide · next experiment
Engineer · proposed small-molecule mechanism
Explanatory state model · not experimental evidence
Macrodomain⇄ closed coupling ⇄SNF2 remodeler

Without the activating PAR signal, the explanatory model remains biased toward the autoinhibited state.

Integrated causal test · explanatory guidance

PAR absent · no prediction recorded · evidence not yet revealed.

Alternative hypothesisLocalisation change rather than conformational release
Selected evidence testOrthogonal biochemical interaction assay
Proposed small-molecule mechanismEvidence-first / no molecular intervention
Complementary evidence; a more direct test is needed.

The selected experiment will be assessed against the ambiguity you chose.

No small-molecule intervention selected. Resolve the evidence ambiguity first.

Evidence boundary: an interaction change is not automatically a complete mechanism. Localisation, abundance, assay geometry and folding remain alternative explanations until constrained by orthogonal evidence.
Mechanism in motion

ALC1 as a modular chromatin machine.

Modular chromatin engineering: how domain architecture and PAR-dependent control shape ALC1 activity. Companion to the Molecular Cell study.