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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Functional conservation between the argininosuccinate lyase of the archaeon Methanococcus maripaludis and the corresponding bacterial and eukaryal genes.

The argH gene encoding argininosuccinate lyase (ASL) of Methanococcus maripaludis was cloned on a 4.7-kb HindIII genomic fragment. The gene is preceded by a short open reading frame (ORF149), which encodes a polypeptide with an unknown function. The two genes are co-transcribed. The ASL of M. maripaludis shares a high amino acid identity with ASLs from both bacterial and eukaryal origins and was able to complement both an argH Escherichia coli mutant and an arg4 yeast mutant, showing its extraordinary evolutionary conservation. Attempts to create an argH auxotroph of M. maripaludis by disrupting the genomic allele were unsuccessful: although a knockout allele of argH was integrated into the M. maripaludis chromosome by homologous recombination, the intact copy was not excluded, suggesting that the argH gene is essential.[1]


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