Correction of Gene Annotation and Other Sequence Analysis of Arabidopsis Proteins Identified on the 2-D Gels in Figure 1.(A) Spot 71, identified as a 17.2-kD.

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Correction of Gene Annotation and Other Sequence Analysis of Arabidopsis Proteins Identified on the 2-D Gels in Figure 1.(A) Spot 71, identified as a 17.2-kD protein at pI 6.0 on the 2-D gel, was not annotated in the Arabidopsis genome, and no overlapping E... Correction of Gene Annotation and Other Sequence Analysis of Arabidopsis Proteins Identified on the 2-D Gels in Figure 1.(A) Spot 71, identified as a 17.2-kD protein at pI 6.0 on the 2-D gel, was not annotated in the Arabidopsis genome, and no overlapping EST could be found. However, a homolog could be reconstructed in soybean using three overlapping ESTs. Using the reconstructed cDNA from soybean, the corresponding gene could be identified in the Arabidopsis genome on chromosome II. Three internal sequences determined by nano-ESI/MS/MS matched sequences in the gene and are indicated by boxes. Analysis with the functional domain predictor Pfam indicated that the protein in spot 71 belongs to the OEC23 family. The predicted lTP or cTP cleavage sites are indicated with arrows. Amino acid residues conserved among all three sequences are shown in red, and those conserved between two sequences are shown in blue. RR and KR motifs in the lTP are boxed.(B) Spot 83 is a fibrillin (on chromosome II) and is an example of a serious misassignment in intron/exon boundaries. The misassignments were corrected by matching of the genomic sequence with a homologous fibrillin (verified entirely by overlapping ESTs) on chromosome III in Arabidopsis (T10K17.220) and verified by matching protein sequences obtained by nano-ESI/MS/MS; these sequence tags are boxed. To arrive at the correct amino acid sequence, amino acids shown in red need to be removed from the annotated sequence, and amino acids shown in blue need to be included. Fifty percent of the protein sequence was changed compared with the predicted sequence.(C) The annotated genome sequence of a FKBP (accession number 22989010) identified in spot 110 has an incorrectly predicted N terminus (MLLVL…). Orthologs in tomato (1) (AW041520), barley (2) (11193249), alfalfa (3) (11902372), and C. reinhardtii (4) (AV624465) all show typical bipartite presequences with typical lumenal TAT motifs. The N terminus of the protein in spot 110 could be extended with one overlapping EST (T76027); however, no EST was found for the very N-terminal end. Amino acid residues conserved among all four sequences are shown in red, and those conserved between fewer than four sequences are shown in blue. The cleavage site for the lTP is indicated with an arrow.(D) Alignment of the Arabidopsis protein sequence of spot 104 with its homologs in seven other plant species. Spot 104 has a typical TAT motif, and in vitro analysis has shown that this protein translocated via the TAT pathway (Mant et al., 1999). Interestingly, the first arginine residue of the twin arginines is replaced by a lysine residue in four of the orthologs. Orthologs are from potato (1) (10447846), tomato (2) (5900060), soybean (3) (7795408), alfalfa (4) (11900582), Mesembryanthemum crystallinum (5) (8330419), barley (6) (11198348), and Physcomitrella patens (7) (6102372). Amino acid residues conserved among all seven sequences are shown in red, and those conserved between fewer than seven sequences are shown in blue. The cleavage site for the lTP is indicated with an arrow. Jean-Benoît Peltier et al. Plant Cell 2002;14:211-236 ©2002 by American Society of Plant Biologists