# Structure-Based Drug Discovery: SBDD Principles & Methods
> Expert guide to Structure-Based Drug Discovery (SBDD), covering molecular docking, virtual screening, X-ray crystallography, and ADMET optimization.

Tags: drug-discovery, medicinal-chemistry, molecular-docking, sbdd, computational-biology, biotechnology, pharmaceuticals
## Slide 1: Structure-Based Drug Discovery
*   Introduction to decoding molecular architecture for medicine design.
*   Context: Advanced Course in Medicinal Chemistry & Computational Biology.

## Slide 4: The Drug Discovery Funnel
*   Process: Target discovery to regulatory approval.
*   Funnel stats: 10,000 compounds screened leads to 1 approved drug.

## Slide 5: Traditional vs. Structure-Based (SBDD)
*   SBDD uses 3D protein structures for rational design.
*   SBDD reduces development costs by up to 50%.

## Slide 8: Levels of Protein Structure
*   Primary (sequence), Secondary (helices/sheets), Tertiary (3D folding), and Quaternary (complexes).
*   Key Insight: Binding pockets emerge at tertiary/quaternary levels.

## Slide 11: Major Drug Target Classes
*   Enzymes: ~47% of targets (Kinases, proteases).
*   GPCRs: ~34% of FDA-approved drugs.
*   Ion Channels, Nuclear Receptors, and Nucleic Acids.

## Slide 14-15: Structural Determination
*   X-ray Crystallography: High resolution (1-3 Å) gold standard.
*   Cryo-EM: No crystallization needed, ideal for large complexes.
*   NMR: Solution state dynamics for small proteins (< 50 kDa).

## Slide 17-18: Molecular Docking & Virtual Screening
*   Docking: Predicting ligand orientation and binding affinity.
*   Workflow: Compound Library (10M+) -> Filters -> Docking -> Re-scoring -> Experimental Validation (5-20 hits).

## Slide 20: Fragment-Based Drug Discovery (FBDD)
*   Uses small molecules (150-300 Da).
*   Rule of Three (Ro3): MW < 300, logP ≤ 3, H-bond donors/acceptors ≤ 3.

## Slide 22-23: Lead Optimization & ADMET
*   SAR: How structural changes affect biological activity.
*   Fact: 40% of clinical trial failures are due to poor ADMET (Absorption, Distribution, Metabolism, Excretion, Toxicity).
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