Make a molecular docking transition clear—with the receptor staying put

A molecular scene can contain the right structures and still be hard to explain. If the receptor and other molecules are already shown in their final positions, viewers may not see what moved—or which structure is meant to remain fixed. A short, controlled transition can make that relationship easier to follow.

In SAMSON, the Dock animation moves selected groups of atoms or meshes toward their current positions. Those current positions are treated as the docked positions; the animation’s starting positions are computed automatically away from them. This makes Dock useful for presenting a transition into an existing arrangement, rather than manually building the starting pose yourself.

Set up the selection before you animate

The selection determines what stays still and what moves. Select at least two structural nodes or meshes. The first selected node acts as the static receptor; the other selected nodes are animated. If your receptor consists of several nodes, put them in a folder and select that folder first, then select the nodes you want to move.

This order is worth checking before you add the effect. If the wrong node is first, the animation may move the structure you intended to keep fixed. For a presentation that needs to be repeatable, explicitly selecting the receptor and moving structures is also clearer than relying on SAMSON to guess when nothing is selected.

Build the transition in a few steps

1. Select the receptor first. Select one receptor node, or a folder containing the receptor nodes.
2. Select the structures to animate. Add the other structural nodes or meshes to the selection.
3. Add Dock. In the Animator, open the Animation panel and double-click the Dock effect.
4. Place the keyframes. The selected nodes will be docked between the animation’s two keyframes. Move the keyframes to set when the transition begins and ends in your presentation.
5. Review the movement. Play the animation and inspect the result. The movement amplitude is computed automatically when the animation is created; if you need to change it, inspect the animation and adjust the amplitude.

The keyframes are not fixed in place: you can move them after creating the animation. That lets you adjust the timing without rebuilding the effect. If the motion feels too abrupt or too gradual, the animation’s easing curve controls how parameters are interpolated between frames.

Use the motion to explain, not to imply

Dock is most helpful when the destination arrangement is already the one you want to show and the missing piece is a readable transition into it. It can help an audience track which selected structures approach a stationary receptor. Since the animation moves structures toward their current positions, it is a presentation of that movement—not, by itself, evidence that a docking calculation has been performed or that a pose is scientifically validated.

One simple check before sharing: replay the animation and confirm that the receptor remains still, the intended structures move, and the transition fits the pace of your explanation. If you are following an older tutorial, note that the former Animation menu is no longer present; animations are accessed through the Animator’s Animation panel and its controls.

For more details, see the Dock animation documentation.

Note: SAMSON and all SAMSON Extensions are free for non-commercial use. Get SAMSON at samson-connect.net.