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1. In the Model Explorer, select C(6) in<br />

Fragment 1.<br />

Hint: It’s in the AA-mon 2 group.<br />

2. Locate the C(98) atom in Fragment 2<br />

(AA-mon 12 group) and Ctrl-click to select it<br />

also.<br />

3. In the Structure menu, point to Measurements<br />

and choose Set Distance Measurement.<br />

The Measurements table opens, (if it is already<br />

open as a tabbed window, it becomes active)<br />

displaying the C(98)-C(6) pair.<br />

4. Click the Optimal cell.<br />

5. Type 5 and press the Enter key.<br />

The optimal distance between C(6) and C(98)<br />

is specified as 5.000Å.<br />

To have a reasonable dock, you must specify at least<br />

four atom pairs. Repeat steps 1 through 5 for<br />

matching atom pairs throughout the fragments. For<br />

example, if you choose one pair from each group<br />

your list might look like the following:<br />

Atoms Actual Optimal<br />

C(34)-C(126) 20.1410 5.0000<br />

C(133)-C(41) 20.3559 5.0000<br />

C(45)-C(137) 20.3218 5.0000<br />

C(50)-C(142) 20.4350 5.0000<br />

Ignore the distances in the Actual cell because they<br />

depend on how the second polymer was positioned<br />

relative to the first polymer when the second<br />

polymer was created.<br />

To begin the docking computation:<br />

1. From the Structure menu, choose Dock.<br />

The Dock dialog box appears.<br />

Atoms Actual Optimal<br />

C(1)-C(93) 21.2034 5.0000<br />

C(98)-C(6) 21.1840 5.0000<br />

C(104)-C(12) 21.2863 5.0000<br />

C(108)-C(16) 21.1957 5.0000<br />

C(22)-C(114) 20.6472 5.0000<br />

C(28)-C(120) 20.7001 5.0000<br />

2. Type 0.100 for the Minimum RMS Error value<br />

and 0.010 for the Minimum RMS Gradient.<br />

The docking computation stops when the RMS<br />

Error or the RMS Gradient becomes less than<br />

the Minimum RMS Error and Minimum RMS<br />

Gradient value.<br />

3. Click Display Every Iteration.<br />

This allow you to see how much the fragments<br />

have moved after each iteration of the docking<br />

computation.<br />

<strong>ChemOffice</strong> 2005/Chem3D Chem3D Tutorials • 43<br />

Tutorial 7: Docking Models

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