Table 1.
List of proteins used for further study and their predicted function.
| Protein name | Accession no. | No. of TM regions (Octopus) | Predicted function |
|---|---|---|---|
| 5TM | LOC100283913 | 8 | A.t. homolog contains a DUF92 domain; predicted to be associated with the chloroplast inner envelope (NCBI). |
| ER-AP | LOC100283096 | 3 | ER-associated protein but was also found in the chloroplast. Predicted to play a role in the formation of tubular ER in mammals and yeast (Nziengui et al., 2007). |
| Hyp2 | LOC100285177 | 11 | Contains a calcium-binding domain and may play a role in calcium modulation or signaling. Its pfam01699 domain suggests a possible role as a Sodium-Calcium exchange protein (NCBI). |
| Hyp3 | LOC100192917 | 4 | Protein of unknown function with a DUF3411 domain (NCBI). |
| HypE | LOC100275334 | 2 | Predicted to be a member of the NADH-ubiquinone oxidoreductase complex I (NCBI). |
| HypF | LOC100283211 | 0 | Similarity to chalcone isomerase (NCBI). |
| HypFD | LOC100282099 | 4 | Put. PRA1-family protein. This protein family contains the glutamate transporter (EAAC1) interacting protein GTRAP3-18. Could regulate metabolite transport (Lin et al., 2001). |
| Mep1 | LOC100383166 | 12 | LrgB-like protein (Bräutigam et al., 2008). |
| Mep3 | LOC100276525 | 4 | Protein of unknown function with DUF3411 domain (Bräutigam et al., 2008; NCBI). |
| UP-a | LOC100285818 | 1 | Proline-rich protein with similarity to members of the alpha-amylase inhibitors (AAI), lipid transfer (LT), and seed storage (SS) protein family (Kader, 1996, 1997; NCBI). |
| UP-d | LOC100192831 | 4 | Belongs to the uncharacterized protein family, UPF0114 (NCBI). |
| UP-f | LOC100277914 | 1 | Contains a MAEBL domain. MAEBL proteins were identified in Plasmodium yoelii and P. falciparum as type I transmembrane proteins with erythrocyte binding activity (Singh et al., 2004). Their function in plants is unknown. |
| PIC/TIC | LOC100273175 | 4 | Contains a DUF3611. Similarity to the A.t. TIC21. Is predicted to be involved in copper homeostasis and protein import into chloroplasts. |
| PEPC | LOC100191762 | 0 | Phosphoenolpyruvate carboxylase; initial carbon assimilation in the mesophyll cells of maize yielding oxaloacetate (Bräutigam et al., 2008). |
| NADP-ME | NP_001105313 | 2 | NADP-Malic enzyme; reduction of malate in the BS chloroplast yielding CO2, NADPH and pyruvate (Bräutigam et al., 2008). |
The abbreviations for proteins are identical to those used in other tables and in the figures. Number of transmembrane regions was determined as described in Section “Materials and Methods.”