Displaying TCP Family from Rice


The cycloidea (cyc) and teosinte branched 1 (tb1) genes code for structurally related proteins implicated in the evolution of key morphological traits. However, the biochemical function of CYC and TB1 proteins remains to be demonstrated. To address this problem, we have analysed the predicted secondary structure of regions conserved between CYC and TB1, and looked for related proteins of known function. One of the conserved regions is predicted to form a non-canonical basic-Helix-Loop-Helix (bHLP) structure. This domain is also found in two rice DNA-binding proteins, PCF1 and PCF2, where it has been shown to be involved in DNA-binding and dimerization. This indicates that the conserved domain most probably defines a new family of transcription factors, which we have termed the TCP family after its first characterised members (TB1, CYC and PCFs). Other plant proteins of unknown function also belong to this family. We have studied two of these in Arabidopsis and have shown that they are expressed in rapidly growing floral primordia. This, together with the proposed involvement of cyc and tb1 in influencing meristem growth, suggests that many members of the TCP family may affect cell division. Some of these genes may have been recruited during plant evolution to generate new morphological traits.

Protein Name
accepted / suggested
Gene Locus Synonym/
Gene Name
Clone in TFome Genome Browser
OsTCP1 LOC_Os01g11550 View in Browser
OsTCP2 LOC_Os01g55750 View in Browser
OsTCP3 LOC_Os01g69980 View in Browser
OsTCP4 LOC_Os02g42380 View in Browser
OsTCP5 LOC_Os02g51280 View in Browser
OsTCP6 LOC_Os02g51310 View in Browser
OsTCP7 LOC_Os03g49880 View in Browser
OsTCP8 LOC_Os03g57190 View in Browser
OsTCP9 LOC_Os04g11830 View in Browser
OsTCP10 LOC_Os04g44440 View in Browser
OsTCP11 LOC_Os05g43760 View in Browser
OsTCP12 LOC_Os06g12230 View in Browser
OsTCP13 LOC_Os07g04510 View in Browser
OsTCP14 LOC_Os07g05720 View in Browser
OsTCP15 LOC_Os08g33530 View in Browser
OsTCP16 LOC_Os08g43160 View in Browser
OsTCP17 LOC_Os09g24480 View in Browser
OsTCP18 LOC_Os09g34950 View in Browser
OsTCP20 LOC_Os11g07460 View in Browser
OsTCP21 LOC_Os12g02090 View in Browser
OsTCP22 LOC_Os12g07480 View in Browser
OsTCP23 LOC_Os12g42190 View in Browser