protein ribbon 3d model

Create a scientifically accurate 3D ribbon diagram of a short protein segment designed for 3D printing. The model should show a polypeptide chain containing valine (VAL) and aspartic acid (ASP) as key residues. Structure requirements: Show a protein ribbon structure with one alpha helix and one short beta strand connected by a loop. The backbone should be represented as a smooth ribbon commonly used in protein structural diagrams. Highlight two amino acids on the chain: valine (VAL) and aspartic acid (ASP). The VAL residue should show its branched hydrophobic side chain extending outward from the ribbon. The ASP residue should show its acidic side chain with a carboxyl group (COO⁻) extending outward. Side chains should be represented in ball-and-stick style while the rest of the protein is a ribbon. Design requirements for printing: Model must be watertight and manifold for 3D printing Minimum thickness of ribbon 3–5 mm Side chains slightly enlarged for visibility Smooth surfaces, no tiny frag