PlantTFDB
Plant Transcription Factor Database
v4.0
Previous version: v1.0, v2.0, v3.0
Malus domestica
MIKC_MADS Family
Species TF ID Description
MDP0000013331MIKC_MADS family protein
MDP0000060753MIKC_MADS family protein
MDP0000128016MIKC_MADS family protein
MDP0000133037MIKC_MADS family protein
MDP0000135652MIKC_MADS family protein
MDP0000136650MIKC_MADS family protein
MDP0000144516MIKC_MADS family protein
MDP0000144597MIKC_MADS family protein
MDP0000146231MIKC_MADS family protein
MDP0000147667MIKC_MADS family protein
MDP0000149676MIKC_MADS family protein
MDP0000156783MIKC_MADS family protein
MDP0000179718MIKC_MADS family protein
MDP0000181583MIKC_MADS family protein
MDP0000183226MIKC_MADS family protein
MDP0000184294MIKC_MADS family protein
MDP0000209705MIKC_MADS family protein
MDP0000218020MIKC_MADS family protein
MDP0000220008MIKC_MADS family protein
MDP0000220168MIKC_MADS family protein
MDP0000224779MIKC_MADS family protein
MDP0000233948MIKC_MADS family protein
MDP0000234073MIKC_MADS family protein
MDP0000242009MIKC_MADS family protein
MDP0000243965MIKC_MADS family protein
MDP0000249592MIKC_MADS family protein
MDP0000250080MIKC_MADS family protein
MDP0000254052MIKC_MADS family protein
MDP0000255146MIKC_MADS family protein
MDP0000259294MIKC_MADS family protein
MDP0000268317MIKC_MADS family protein
MDP0000269921MIKC_MADS family protein
MDP0000270062MIKC_MADS family protein
MDP0000278738MIKC_MADS family protein
MDP0000280009MIKC_MADS family protein
MDP0000286643MIKC_MADS family protein
MDP0000289836MIKC_MADS family protein
MDP0000289858MIKC_MADS family protein
MDP0000300752MIKC_MADS family protein
MDP0000312382MIKC_MADS family protein
MDP0000314765MIKC_MADS family protein
MDP0000315938MIKC_MADS family protein
MDP0000316609MIKC_MADS family protein
MDP0000322567MIKC_MADS family protein
MDP0000324166MIKC_MADS family protein
MDP0000324259MIKC_MADS family protein
MDP0000326390MIKC_MADS family protein
MDP0000326906MIKC_MADS family protein
MDP0000366022MIKC_MADS family protein
MDP0000370413MIKC_MADS family protein
MDP0000527190MIKC_MADS family protein
MDP0000574222MIKC_MADS family protein
MDP0000605482MIKC_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