H-bonding side-chains

[colby]

Reno T. Nguyen wrote:
> 
> Hi,
> 
> Check out the URL address http://www.proteometrics.com/aainfo/contents.htm
> There's info. on residue hydrogen bonding for Arginine and tryptophan.

Hi,

	Thanks for your reply. But the site you mention has the same link as
the site I mentioned earlier, it was the data at this site that made me
raise the question. I'm interested in knowing what makes the His side
chain an *acceptor* of H-bonds, but not the Arg and Trp side chains.
(All these side chains do act as H-bond *donors*).

I appreciate any replies.

-colby

> On Wed, 2 Jun 1999, colby wrote:
> 
> > Date: Wed, 02 Jun 1999 17:44:00 -0500
> > From: colby <none at uiuc.edu>
> > Newsgroups: bionet.molbio.proteins
> > Subject: H-bonding side-chains
> >
> > Can the side chain of a tryptophan residue accept a H-bond? What about
> > an arginine residue?
> >
> > According to http://swift.embl-heidelberg.de/future/aainfo/hbonds.html,
> > the only site on the web I found that discusses amino acid side chain
> > H-bonding, these two residues do not seem to accept H-bonds.