Table I.
PcG homologs in the Arabidopsis genome
| PcG Proteins | Best Score in Arabidopsis | Likely Arabidopsis Homologs |
|---|---|---|
| esc (extra sex combs) | AF129516 (4e-73) | Fie |
| E(z) (Enhancer of zeste) | AF100163 (7e-69) | Clf, Eza1, and Medea |
| E(pc) enhancer of polycomb | AC011808 (2e-20) | AAG10815 and AAC17077 |
| pho (pleiohomeotic) | AL391716 (4e-13) | 0 |
| mxc (multi sex combs) | T00677 (2e-10) | 0 |
| Pc (Polycomb) | AB006706 (5e-07) | 0 |
| psc (posterior sex combs) | AB026655 (2e-06) | 0 |
| asx (additional sex combs) | AC007651 (0.18) | 0 |
| pcl (polycomblike) | AL132966 (0.019) | 0 |
| ph (polyhomeotic) | AC006592 (0.23) | 0 |
| scm (sex combs on midleg) | AJ292982 (0.82) | 0 |
| super sex combs (sxc) | Not cloned in fruit fly | N.A. |
| sex combs extra (sce) | Not cloned in fruit fly | N.A. |
A search for Polycomb-group homologs in Arabidopsis. The protein sequences of the fruit fly PcG proteins were used to perform TBLASTN searches of the Arabidopsis genomic sequence. The fruit fly sequences used were as follows: esc, S58672; E(z), AAC46462; E(Pc), AAF58641; pho, AAF59378; mxc, AAF27644; Pc, CAA39229; psc, CAA41965; asx, CAA04568; pcl, AAA64457; ph, CAA45211 and S23632; scm, AAB57632. The accession no. for the Arabidopsis sequence with the best BLAST score for each search is shown in the second column (the BLASTP score in parentheses). The number of Arabidopsis homologs for each PcG protein is indicated in the last column. The esc and E(z) homologs have been previously documented (Goodrich et al., 1997; Grossniklaus et al., 1998; Ohad et al., 1999). The accession nos. for the predicted protein sequences of the two E(Pc) homologs found in the Arabidopsis genome are shown in parentheses.