[citation][nom]gilgamex[/nom]Did anyone fully understand the actually terminology used for this whole explanation? *_*[/citation]
For what I understand they use proteins which are catalysts and form the silicat skeleton. Because these proteins are a group of different proteins with different properties, they are trying to separate them based upon their chemical properties (by looking which ones react with some metals and which not).
The DNA thing comes from the fact that usually you want some kind of bacteria or living being which will synthesize that protein (which is done following the sequences in DNA: and so the DNA manipulation to get the proper protein which will generate the proper material.