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dirigent proteins

Michael Ashburner (Genetics) ma11 at
Tue Jul 2 02:50:19 PDT 2002

Sorry to be so long in replying to this:

I think that we need a new function term for dirigent proteins.  I have done
some reading and suggest this new term:

guiding stereospecific synthesis ; GO:??????? ; synonym:dirigent protein

definition: The orientation of free radical substrates in such a way that
only a particular stereoisomer is synthesised by an enzyme. Best characterised
as a function during lignan biosynthesis.

It is not clear where this should go, but I suggest that it could be a
direct child of "enzyme regulator" (GO:0030234) whose definition is
"Modulates the activity of an enzyme."

Feedback please.


> From owner-gofriends at Thu Jun 13 18:51:43 2002
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> From: "Hannick, Linda" <lhannick at>
> To: geneontology-term-request at,
>         "Smith, Roger"
> 	 <rsmith at>
> Cc: Midori A Harris <midori at genome.Stanford.EDU>, gofriend at genome.Stanford.EDU
> Date: Thu, 13 Jun 2002 13:50:08 -0400
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> We are currently looking at dirigent proteins, and are not experts in lignan
> biosynthesis.  Maybe someone with more expertise in this field can help us
> come up with a GO term to accurately describe the function of this protein
> and where it fits in the DAG (GO:0009807 accurately describes the process
> that it is involved in).  
> Dirigent proteins, in the presence of an oxidase or one electron oxidant,
> affect stereoselective biomolecular phenoxy radical coupling (See Gang et
> al. (1999) Chem Biol 6, 143-151).  They do not have a catalytically active
> (oxidative) center, but they orient free radical substrates in such a way
> that random coupling cannot occur, and only the 8-8'-coupled intermediate
> (+)-pinoresinol is formed.  Any suggestions on where this should be added?
> Thanks
> Roger Smith
> The Institute for Genomic Research
> Bioinformatics Analyst
> rsmith at
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> Linda I. Hannick, Ph.D.
> The Institute for Genomic Research
> Bioinformatics Analyst
> 9712 Medical Center Drive
> Rockville  MD  20850 
> ~~~~~~~~~~~~~~~~~~~~
> 301-838-5857 voice
> 301-838-0208 fax
> lhannick at 

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