GrassTFDB :: Browse Family::Maize

Displaying CCAAT-HAP5 Family from Maize


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
ZmCA5P1 GRMZM2G074773 CA5P1 pUT3990 View in Browser
ZmCA5P2 GRMZM2G479610 CA5P2 pUT3991 View in Browser
ZmCA5P3 GRMZM2G161680 CA5P3 pUT1431 View in Browser
ZmCA5P4 GRMZM2G083964 CA5P4 View in Browser
ZmCA5P5 GRMZM2G311316 CA5P5 pUT3048 View in Browser
ZmCA5P6 GRMZM2G375448 CA5P6 pUT6492 View in Browser
ZmCA5P7 GRMZM2G124421 CA5P7 pUT3084 View in Browser
ZmCA5P8 GRMZM2G105317 CA5P8 pUT3038 View in Browser
ZmCA5P9 GRMZM2G091433 CA5P9 pUT1461 View in Browser
ZmCA5P10 GRMZM2G440949 CA5P10 pUT3111 View in Browser
ZmCA5P11 GRMZM2G089812 CA5P11 pUT3114 View in Browser
ZmCA5P12 GRMZM2G022162 CA5P12 View in Browser
ZmCA5P13 GRMZM2G113127 CA5P13 View in Browser
ZmCA5P14 GRMZM2G174776 CA5P14 pUT3983 View in Browser
ZmCA5P15 GRMZM2G099461 CA5P15 pUT3656 View in Browser
ZmCA5P16 GRMZM2G078691 CA5P16 pUT3964 View in Browser
ZmCA5P17 GRMZM2G052499 CA5P17 pUT3965 View in Browser
ZmCA5P18 AC201832.3_FG006 CA5P18 View in Browser