Why only L amino acids?

Louis Hom lhom at OCF.Berkeley.EDU
Wed Jul 6 18:52:15 EST 1994


I think you can invoke an argument of parsimony in this explanation; selection
should favor the simplest system.  Our present repertoire of enzymes and
structural proteins do very well within the limits of 20-ish amino acid
forms.  Our systems accomplish what they need to accomplish under these
circumstances.  It would take a lot more components to deal with synthesizing
a lot of D aa's as well as L aa's, plus you would have to activate the tRNAs
and modify the meanings of codons too.  It's a lot of work for what appears
to be superfluous variation.
-- 
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*   Lou Hom			*	"All folks are family."            *
*   lhom at ocf.berkeley.edu       *    			-- John Saponara   * 
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