In Arabidopsis and rice, this gene was described to encode a MADS-box transcription factor expressed in the carpel and ovules and to play a maternal role in fertilization and seed development.
The SPOROCYTELESS gene of Arabidopsis was described to encode a transcription factor that is required for the initiation of both micro- and megagametogenesis and is expressed in the sporogenous tissue of the anther and the ovule.
Also, a higher affinity for binding single-stranded nucleic acids than double-stranded has also been described to exist in the NAC proteins encoded by HIV-1 NC [ 34, 35], the LTR retrotransposons from the yeast Ty-1 NC-like protein [ 36] and other non-LTR retrotransposons, such as the mouse L1 protein and Drosophila I factor ORF1p [ 3, 11].
This process was described to involve the SCE1 endonuclease gene encoded in the intron, which generates a double-strand break near the intron insertion site (Jacquier and Dujon 1985; Macreadie et al. 1985; Zinn and Butow 1985; Zinn et al. 1987).
One of the genes, mamK has been described as encoding a prokaryotic actin-like protein which when it polymerizes forms in the cytoplasm filamentous structures that provide the scaffold for magnetosome alignment.
Recently, an eighth gene, ACT1 (a. k. a. TRAF3IP2) has been described as encoding a ubiquitin ligase that may contain a very divergent U box [ 16].
Although its function has not been described, CCBE1 encodes a protein of 44 kDa that contains a number of recognised structural domains, including an EGF-like domain that incorporates an aspartic acid/asparagine (Asp/Asn) hydroxylation site.
In other fungal model systems, such as Magnaporthe oryzae and Ustilago maydis, telomere-linked helicase gene families have been described, which are encoded by genes bearing similarity to the helicase genes of Y′ elements (Farman 2007).
Five RAE-1 proteins have been described which are encoded by 5 different rae-1 genes: α, β, γ, δ and ε.
