Hi Bala, As mentioned in the FindHBond page, <http://www.cgl.ucsf.edu/chimera/docs/ContributedSoftware/findhbond/ findhbond.html> "All potential H-bonding interactions fulfilling the criteria are shown." In other words, each is possible taken individually based on distances and angles, but it will not necessarily be possible to form all of them at the same time. If the structure does not include hydrogens, for example, the H-bonds possible from a hydroxyl oxygen might require the OH hydrogen to be in different places. The H-bonds are shown with pseudobonds, and there are several ways to change their appearance. The line style is actually an attribute of the pseudobond group. Ways to change this: (a) Ctrl-click to select one H-bond, press up arrow to expand selection to all H-bonds, open Selection Inspector, inspect "Pseudobond group" and change the "line style" (b) start Pseudobond Panel (under Tools... General Controls), click on group name "hydrogen bonds" on the left and then "attributes" on the right, change "line style" (c) use command "setattr" e.g. something like: setattr g lineType 3 <http://www.cgl.ucsf.edu/chimera/docs/UsersGuide/midas/setattr.html> The attribute name (e.g. lineType) and what values mean what (e.g. 3 = dotted, which just looks like shorter dashes to me) are shown in the balloon help when you put the mouse over the attribute dialogs mentioned in (a) and (b). I hope this helps, Elaine ----- Elaine C. Meng, Ph.D. UCSF Computer Graphics Lab (Chimera team) and Babbitt Lab Department of Pharmaceutical Chemistry University of California, San Francisco On Sep 4, 2009, at 8:33 AM, Bala subramanian wrote:
Friends, Is there any way to represent hydrogen bonds as dotted lines instead of a solid line in Chimera. Sometimes hbond analysis in chimera shows same atom to be involved in two hydrogen bonds, why is it so ? Thanks, Bala