GrassTFDB :: Browse Family::Rice

Displaying CCAAT-HAP3 Family from Rice


The CCAAT motif is found in the promoters of many eukaryotic genes. In yeast a single complex of three proteins termed HAP2 HAP3 and HAP5 binds to this sequence and in mammals the three components of the equivalent complex (called variously NF-Y CBF or CP1) are also represented by single genes. Here we report the presence of multiple genes for each of the components of the CCAAT-binding complex HAP2 35 from Arabidopsis. Three independent Arabidopsis HAP subunit 2 (AtHAP2) cDNAs were cloned by functional complementation of a yeast hap2 mutant and two independent forms each of AtHAP3 and AtHAP5 cDNAs were detected in the expressed sequence tag database. Additional homologs (two of AtHAP3 and one of AtHAP5) have been identified from available Arabidopsis genomic sequences. Northern-blot analysis indicated ubiquitous expression for each AtHAP2 and AtHAP5 cDNA in a range of tissues whereas expression of each AtHAP3 cDNA was under developmental and/or environmental regulation. The unexpected presence of multiple forms of each HAP homolog in Arabidopsis compared with the single genes in yeast and vertebrates suggests that the HAP235 complex may play diverse roles in gene transcription in higher plants.

Protein Name
accepted / suggested
Gene Locus Synonym/
Gene Name
Clone in TFome Genome Browser
OsCA3P1 LOC_Os01g61810 View in Browser
OsCA3P2 LOC_Os01g70880 View in Browser
OsCA3P3 LOC_Os01g70890 View in Browser
OsCA3P4 LOC_Os02g49370 View in Browser
OsCA3P5 LOC_Os02g49410 View in Browser
OsCA3P6 LOC_Os03g29970 View in Browser
OsCA3P7 LOC_Os05g38820 View in Browser
OsCA3P8 LOC_Os05g49780 View in Browser
OsCA3P9 LOC_Os06g17480 View in Browser
OsCA3P10 LOC_Os07g41580 View in Browser
OsCA3P11 LOC_Os08g07740 View in Browser
OsCA3P12 LOC_Os09g39490 View in Browser