Which of the following best describes relaxed-complex (multiple-receptor) docking?

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Question being examined: Which statement best describes relaxed-complex (multiple-receptor) docking?
Option 1: 'Relaxed-complex docking simplifies protein-ligand interaction potentials for faster docking calculations.' While simplifications can occur in some docking approaches, relaxed-complex docking specifically emphasizes receptor flexibility by using an ensemble of conformations, not merely simplifying interactions for speed. This option misses the core idea of accommodating multiple receptor states.
Option 2: 'Relaxed-complex docking only considers weakly bound protein-ligand complexes for analysis.' This is inaccurate because relaxed-complex docking is not defined by focusing on weak bindings; it centers on sampling receptor conformations to better capture realistic binding possibilities across an ensemble, regardless of binding strength.
Option 3: 'Relaxed-complex docking involves iteratively refining both the ligand and receptor conformations simultaneously.' While docking workflows may include iterative refinement, relaxed-complex docking specifically employs a set of predefined receptor conformations (an ensemble) rather than continuous simultaneous refinement of both ligand and receptor in a single iterative loop. This mischaracterizes the standard description of the method.
Option 4: 'Relaxed-complex docking restricts ligand movement to reduce conformational entropy.' In fact, the approach seeks to capture receptor flexibility and ligand binding across multiple receptor states; it does not impose a restriction that would artificially reduce conformational entropy or ligand motion as a defining feature.
Option 5: 'Relaxed-complex docking involves docking ligands to an ensemble of protein conformations to account for receptor flexibility.' This statement directly matches the method's core idea: using multiple receptor conformations to reflect the dynamic nature of the binding site and improve docking accuracy by acknowledging receptor flexibility.
Overall, the reasoning emphasizes that the distinctive trait of relaxed-complex docking is leveraging an ensemble of receptor structures to model flexibility, rather than relying on single rigid structures, simplifying potentials, restricting motion, or focusing only on weak complexes. The incorrect options mix partial truths with mischaracterizations that do not align with the foundational concept of docking to multiple receptor states. If you recall the purpose of ensemble docking, you can see why Option 5 best captures the method's intent.

2254 BIOSC 1544 SEC1000 Exam #3- Requires Respondus LockDown Browser

Which of the following best describes relaxed-complex (multiple-receptor) docking?

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