Tuesday, August 26, 2008

DNA Primase

Organisms called Archaea were discovered in fossils dating, according to accepted radiometric methods, from about 3.8 billion years ago (bya). I've shown some of the molecules from the first of bacteria, found in fossils from 2 bya, Cyanobacteria (and will show one of Archaea soon). Another molecule to add to the list is DNA Primase which you can read about in the link to Wikipedia. The primase helps the helicase make the DNA ready for replication. A picture of one is here.

This protien molecule has 646 amino acids as reported by UniprotKB/trEMBL here. The amino acids are shown and described in the previous post. This is a different protein than the helicase and topoisomerase which I showed in previous pictures (use DNA link under topics and label or scroll down). The molecules are each shaped uniquely to give them the ability to do specific jobs, just like a toaster and coffee-maker are shaped differently, with different shapes and arrangements of parts.

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