The world's first wiki where authorship really matters (Nature Genetics, 2008). Due credit and reputation for authors. Imagine a global collaborative knowledge base for original thoughts. Search thousands of articles and collaborate with scientists around the globe.

wikigene or wiki gene protein drug chemical gene disease author authorship tracking collaborative publishing evolutionary knowledge reputation system wiki2.0 global collaboration genes proteins drugs chemicals diseases compound
Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

Identification of functionally important residues of Arabidopsis thaliana S-adenosylmethionine decarboxylase.

The Arabidopsis thaliana S-adenosylmethionine decarboxylase (AdoMetDC) cDNA (GenBank(TM) U63633) was cloned, and the AdoMetDC protein was expressed, purified, and characterized. The K(m) value for S-adenosylmethionine (AdoMet) is 23.1 microM and the K(i) value for methylglyoxal bis-(guanylhydrazone) (MGBG) is 0.15 microM. Site-specific mutagenesis was performed on the AdoMetDC to introduce mutations at conserved cysteine (Cys(50), Cys(83), and Cys(230)) and lysine(81) residues, chosen by examination of the conserved sequence and proved to be involved in enzymatic activity by chemical modification. The AdoMetDC mutants K81A and C83A retained up to 60 and 10% of wild type activity, respectively, demonstrating that lysyl and sulfhydryl groups are required for full catalytic activity. However, changing Cys(50) and Cys(230) to alanine had minimal effects on the catalytic activity. Changing Lys(81) to alanine produced an altered substrate specificity. When lysine was used as a substrate instead of AdoMet, the substrate specificity for lysine increased 6-fold. The K(m) value for AdoMet is 11-fold higher than that of the wild type, but the V(max) value is more than 60%. Taken together, the results suggest that the lysine(81) residue is critical for substrate binding.[1]


WikiGenes - Universities