Hi Amna,

> DNA molecule has internal HBONDS too.. how can i see the hbonds made
> between just ligand and DNA, ???

If there is nothing else than DNA and ligand, this should probably work
(otherwise, be more precise with the selections...):

PyMOL> distance hbonds, (polymer), (organic), mode=2

> how can i show just  interacting residues of  DNA with ligand
> i am unable to create this presentation..

PyMOL> show sticks, (polymer) within 5 of (organic)

Again, if "polymer" and "organic" are ambiguous, replace them with more
explicit selections like (chain A and resi 34).

http://pymolwiki.org/index.php/Single-word_Selectors
http://pymolwiki.org/index.php/Selection_Algebra
http://pymolwiki.org/index.php/Property_Selectors

Cheers,
  Thomas

-- 
Thomas Holder
PyMOL Developer
Schrödinger Contractor

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