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)

Proline365 is a critical residue for the activity of XMI-ER1 in Xenopus embryonic development.

Xmi-er1 is an immediate-early gene encoding a transcriptional regulator whose expression is activated by fibroblast growth factor ( FGF) during mesoderm induction in Xenopus. In this study, we examined the role of xmi-er1 in embryonic development and mesoderm induction and investigated the importance of various functional domains in the protein sequence. Overexpression of xmi-er1 in embryos resulted in truncations of the anteroposterior axis, with most of the abnormal embryos exhibiting deficiencies in both anterior and posterior structures. Whole mount in situ hybridization for the early mesodermal marker brachyury (Xbra) revealed a dramatic reduction of Xbra expression in xmi-er1-injected embryos, while mesoderm induction assays showed that overexpression of xmi-er1 significantly reduced the percentage of explants induced by FGF-2. Site-directed mutagenesis of several functional domains, including the ELM2 domain, the SANT domain, a putative MEK phosphorylation site, and a proline-rich region showed that only proline 365 in the proline-rich region is required for the effect on embryonic development and mesoderm induction. These data demonstrate that XMI-ER1 is a negative regulator of FGF, perhaps serving to limit the extent of mesoderm formation in vivo, and that this activity is mediated by proline 365.[1]


  1. Proline365 is a critical residue for the activity of XMI-ER1 in Xenopus embryonic development. Teplitsky, Y., Paterno, G.D., Gillespie, L.L. Biochem. Biophys. Res. Commun. (2003) [Pubmed]
WikiGenes - Universities