PlantTFDB
Plant Transcription Factor Database
v4.0
Previous version: v1.0, v2.0, v3.0
Capsella rubella
MIKC_MADS Family
Species TF ID Description
Carubv10001783mMIKC_MADS family protein
Carubv10001906mMIKC_MADS family protein
Carubv10001962mMIKC_MADS family protein
Carubv10002596mMIKC_MADS family protein
Carubv10002792mMIKC_MADS family protein
Carubv10003771mMIKC_MADS family protein
Carubv10005558mMIKC_MADS family protein
Carubv10005653mMIKC_MADS family protein
Carubv10005695mMIKC_MADS family protein
Carubv10005697mMIKC_MADS family protein
Carubv10006453mMIKC_MADS family protein
Carubv10006544mMIKC_MADS family protein
Carubv10010134mMIKC_MADS family protein
Carubv10010907mMIKC_MADS family protein
Carubv10011954mMIKC_MADS family protein
Carubv10014470mMIKC_MADS family protein
Carubv10015972mMIKC_MADS family protein
Carubv10017787mMIKC_MADS family protein
Carubv10017790mMIKC_MADS family protein
Carubv10017886mMIKC_MADS family protein
Carubv10017951mMIKC_MADS family protein
Carubv10018408mMIKC_MADS family protein
Carubv10018833mMIKC_MADS family protein
Carubv10019520mMIKC_MADS family protein
Carubv10020210mMIKC_MADS family protein
Carubv10020226mMIKC_MADS family protein
Carubv10020947mMIKC_MADS family protein
Carubv10020979mMIKC_MADS family protein
Carubv10021590mMIKC_MADS family protein
Carubv10022005mMIKC_MADS family protein
Carubv10023910mMIKC_MADS family protein
Carubv10023941mMIKC_MADS family protein
Carubv10023953mMIKC_MADS family protein
Carubv10023996mMIKC_MADS family protein
Carubv10024046mMIKC_MADS family protein
Carubv10025002mMIKC_MADS family protein
Carubv10026982mMIKC_MADS family protein
Carubv10027017mMIKC_MADS family protein
Carubv10027093mMIKC_MADS family protein
Carubv10027142mMIKC_MADS family protein
Carubv10027148mMIKC_MADS family protein
Carubv10027529mMIKC_MADS family protein
Carubv10028173mMIKC_MADS family protein
MIKC_MADS (MIKC-type MADS) Family Introduction

The best studied plant MADS-box transcription factors are those involved in floral organ identity determination. Analysis of homeotic floral mutants resulted in the formulation of a genetic model, named the ABC model, that explains how the combined functions of three classes of genes (A, B, and C) determine the identity of the four flower organs (reviewed by Coen and Meyerowitz, 1991). Arabidopsis has two A-class genes (AP1 and AP2 [Bowman et al., 1989]), two B-class genes (PI and AP3), and a single C-class gene (AG), of which only AP2 is not a MADS-box gene. Recently, it was shown that the Arabidopsis B- and C-function genes, which control petal, stamen, and carpel development, are functionally dependent on three highly similar MADS-box genes, SEP1, SEP2, and SEP3 (Pelaz et al., 2000). Interestingly, only when mutant knockout alleles of the three SEP genes were combined in a triple sep1 sep2 sep3 mutant was loss of petal, stamen, and carpel identity observed, resulting in a flower composed of only sepals. This example shows that redundancy occurs in the MADS-box gene family, which complicates reverse genetic strategies for gene function analysis. The SHP genes provide another example of MADS-box gene redundancy. shp1 and shp2 single mutants do not exhibit any phenotypic effect, whereas in the double mutant, development of the dehiscence zone is disturbed in the fruit, resulting in a failure to release seeds (Liljegren et al., 2000)[1].

It has been proposed that there are at least 2 lineages (type I and type II) of MADS-box genes in plants, animals, and fungi. Most of the well-studied plant genes are type II genes and have three more domains than type I genes from the N to the C terminus of the protein:intervening (I) domain (~30 codons), keratin-lik e coiled-coil (K) domain (~70 codons), and Cterminal (C) domain (variable length). These genes are called the MIKC-type and are specific to plants[2].

The MADS-box is a DNA binding domain of 58 amino acids that binds DNA at consensus recognition sequences known as CArG boxes [CC(A/T)6GG] (Hayes et al., 1988; Riechmann et al., 1996b). The interaction with DNA has been studied in detail for the human and yeast MADS-box proteins thanks to the resolved crystal structures (Pellegrini et al., 1995; Santelli and Richmond, 2000). The I domain is less conserved and contributes to the specification of dimerization. The K domain is characterized by a coiled-coil structure, which facilitates the dimerization of MADS-box proteins (Davies et al., 1996; Fan et al., 1997). The C domain is the least conserved domain; in some cases, it has been shown to contain a transactivation domain or to contribute to the formation of multimeric MADS-box protein complexes (Egea-Cortines et al., 1999; Honma and Goto, 2001)[1].

1.Parenicova L, de Folter S, Kieffer M, Horner DS, Favalli C, Busscher J, Cook HE, Ingram RM, Kater MM, Davies B, Angenent GC, Colombo L.
Molecular and phylogenetic analyses of the complete MADS-box transcription factor family in Arabidopsis: new openings to the MADS world.
Plant Cell. 2003 Jul;15(7):1538-51.
PMID: 12837945
2.Nam J, dePamphilis CW, Ma H, Nei M.
Antiquity and evolution of the MADS-box gene family controlling flower development in plants.
Mol Biol Evol. 2003 Sep;20(9):1435-47. Epub 2003 May 30.
PMID: 12777513