Displaying C2C2-CO-like Family from Rice  
Information about C2C2-CO-like family
The CO (CONSTANS) gene of Arabidopsis has an important role in the regulation of flowering by photoperiod. CO is part of a gene family with 17 members that are subdivided into three classes termed Group I to III here. All members of the family have a CCT (CO CO-like TOC1) domain near the carboxy terminus. Group I genes which include CO have two zinc finger B-boxes near the amino terminus. Group II genes have one B-box and Group III genes have one B-box and a second diverged zinc finger. Analysis of rice (Oryza sativa) genomic sequence identified 16 genes (OsA-OsP) that were also divided into these three groups showing that their evolution predates monocot/dicot divergence. Eight Group I genes (HvCO1-HvCO8) were isolated from barley (Hordeum vulgare) of which two (HvCO1 and HvCO2) were highly CO like. HvCO3 and its rice counterpart (OsB) had one B-box that was distantly related to Group II genes and was probably derived by internal deletion of a two B-box Group I gene. Sequence homology and comparative mapping showed that HvCO1 was the counterpart of OsA (Hd1) a major determinant of photoperiod sensitivity in rice. Major genes determining photoperiod response have been mapped in barley and wheat (Triticum aestivum) but none corresponded to CO-like genes. Thus selection for variation in photoperiod response has affected different genes in rice and temperate cereals. The peptides of HvCO1 HvCO2 (barley) and Hd1 (rice) show significant structural differences from CO particularly amino acid changes that are predicted to abolish B-box2 function suggesting an evolutionary trend toward a one-B-box structure in the most CO-like cereal genes.
(Taken from AGRIS)

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Protein Name
[Suggested/Accepted]
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RAP-DB Id
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DNA Binding Preferences
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OsCOL1LOC_Os02g08150Os02g0178100
OsCOL2LOC_Os02g39710Os02g0610500
OsCOL3LOC_Os02g49230Os02g0724000
OsCOL4LOC_Os02g49880Os02g0731700
OsCOL7LOC_Os04g42020Os04g0497700
OsCOL9LOC_Os06g15330Os06g0264200
OsCOL11LOC_Os06g19444Os06g0298200 Available
OsCOL16LOC_Os09g06464Os09g0240200
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