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Fig. 2. Protein structure and relationship trees of monomeric G-proteins and MAP4Ks. (A) Comparison of the primary structure of AtSGP proteins with the homologous S. pombe protein. The plant-specific extensions are shown in white. Both identity (bold) and similarity percentages are shown. (B) Phenogram was generated using the Neighbour-Joining algorithm (Saitou and Nei, 1987) and illustrates the evolutionary relatedness of AtSGP1 and AtSGP2 to a representative subset of monomeric GTPases. The subfamily including AtSGP1, AtSGP2, spg1p from S. pombe, Tem1 from S. cerevisiae and GiTem1 from G. intestinalis is boxed. The sequences have been submitted to the EMBL database under the accession numbers AJ238846 (AtSGP1), AJ505743 (AtSGP2), AJ505744 (AtMAP4K{alpha}1), AJ505745 (AtMAP4K{alpha}2). (C) Comparison of the primary structures of MAP4K{alpha} proteins with the homologous S. pombe proteins. The plant-specific extensions are shown in white, the catalytic domains in black. Both identity (bold) and similarity percentages are shown. (D) Schematic representation of the MAP4K groups based on Neighbour-Joining analyses of the catalytic domains. Number of proteins used to build the tree is indicated in brackets after each group of MAP4K.





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