Table 1

Classification of putative transcription factors of Medicago into families and sub-families

TF Family
No. of
Genes
Characteristic Domain
(InterPro No.)
Domain
Function
Domain Description

MYB/HD-like
76
IPR001005, IPR009057
D
Myb, DNA-binding; homeodomain like
MYB
58
IPR001005
D
Myb, DNA-binding
C2H2 (Zn)
64
IPR007087
NA
Zn-finger, C2H2 type
AP2/EREBP
55
IPR001471
D
Pathogenesis-related transcriptional factor and ethylene response factor
BHLH
49
IPR001092
D
Basic helix-loop-helix dimerisation region bHLH
HD-like
50
IPR009057
D
Homeodomain like
HD family

IPR001356
D
Homeobox
HD
25



HD-ZIP
5
IPR006712
P
HD-ZIP protein, N terminus
HD-PHD finger
2
IPR001965
P
Zn-finger like, PHD-finger
MADS
48
IPR002100
D
TF, MADS-box
BZIP
41
IPR004827
D
Basic Leu zipper (bZIP) TF
PHD
34
IPR001965
P
Zn-finger like, PHD-finger
WRKY family

IPR003657
D
DNA-binding WRKY
WRKY
29



LLR WRKY
1
IPR001611

Leu-rich repeat
ABI3/VP1
29
IPR003340
D
TF B3
NAC
29
IPR003441
D
No apical meristem (NAM) protein
C3H-type1(Zn)
27
IPR000571
D
Zn-finger, C-x8-C-x5-C-x3-H type
ARF
23
IPR003340, IPR010525, IPR011525
D

JUMONJI
20
IPR003347
D
TF jumonji, jmjC
GRAS
19
IPR005202
P
GRAS TF
HMG
15
IPR000637
D
HMG-I and HMG-Y, DNA binding
AS2
14
IPR004883
P
Lateral organ boundaries
C2C2 (Zn)




Dof
13
IPR003851
D
Zn-finger, Dof type
GATA
7
IPR000679
D
Zn-finger, GATA type
CO-like
6
IPR000315
D
Zn-finger, B-box
YABBY
5
IPR006780
D
YABBY protein
CCAAT-HAP3 type
12
IPR003958
D
TF CBF/NF-Y/archaeal histone
GRF
8
IPR010666
D
Zn-finger, GRF type
SBP
8
IPR004333
D
SBP
EIL
7
IPR006957
D
Ethylene insensitive 3
LIM
7
IPR001781
P
Zn-binding protein, LIM
SNF2
6
IPR000330
D
SNF2 family N-terminal domain
E2F/DP
5
IPR003316
D
TF E2F/dimerisation partner (TDP)
TCP
5
IPR005333
D
TCP TF
FHA
5
IPR000253
D
Forkhead-associated
ARID
4
IPR001606
D
AT-rich interaction region
HSF
4
IPR000232
D
Heat shock factor (HSF)-type, DNA binding
AUX/IAA
3
IPR003311
D
AUX/IAA protein
SRS
3
IPR006510
D
Zn-finger, LRP1 type
TUB
3
IPR000007
D
Tubby
ZIM
3
IPR010399
D
ZIM
DDT
3
IPR004022
D
DDT
ZF-HD
2
IPR006455
D
Homeobox domain, ZF-HD class
MBF1
2
IPR001387
D
Helix-turn-helix type 3
S1Fa-like
2
IPR006779
D
DNA binding protein S1FA
CAMTA
2
IPR005559
D
CG-1
LFY
1
IPR002910
D
Floricaula/leafy protein
Nin-like
1
IPR003035
D
Plant regulator RWP-RK
TAZ
1
IPR000197
P
Zn-finger, TAZ-type

Potentially novel plant TFs and transcriptional regulators

CCHC (Zn)
112
IPR001878
NA
Zn-finger, CCHC-type
RR
16
IPR001789, IPR011006
RD
Response regulator receiver
DHHC (Zn)
14
IPR001594
D or P
Zn-finger, DHHC-type
HTH




FIS
11
IPR002197
D
Helix-turn-helix, Fis-type
AraC
2
IPR000005
D
Helix-turn-helix, AraC type
BTB/POZ
7
IPR000210
P
BTB
TTF-type (Zn)
6
IPR006580
D
Zn-finger, TTF-type
BD
6
IPR001487
P
Bromodomain
Lambda-DB
3
IPR010982
D
Lambda_DNA_bd
TrpR
3
IPR010921
D
Trp repressor/replication initiator
TPR
3
IPR001440
P
Tetratricopeptide TPR_1
KRAB-box
2
IPR001909
P
KRAB box
NRs
2
IPR008946
LBD
Steroid nuclear receptor, ligand binding
R3H
2
IPR001374
NA
Single-stranded nucleic acid binding R3H
YEATS
2
IPR005033
TA
YEATS
U1-type (Zn)
2
IPR003604
NA
Zn-finger, U1-type
A20-like
2
IPR002653
P
Zn-finger, A20-type
Euk_TF
1
IPR008917
D
Euk_TF, DNA binding
NGN
1
IPR006645
D
NGN
p53-like
1
IPR008967
D
p53-like TF, DNA binding
SSB protein
1
IPR011344
D
Single-strand binding protein
ssDB TR
1
IPR009044
D
Single-strand DNA binding transcriptional regulator
TCoAp15
1
IPR003173
D
Transcriptional coactivator p15
BED-type (Zn)
1
IPR003656
D
Zn-finger, BED-type predicted
TCoA
1
IPR009255
TA
Transcriptional coactivation
Tc/PD
1
IPR001533
TA
Transcriptional coactivator

IMGAG (International Medicago Gene Annotation Group)-proteins were classified as putative TFs if they contained characteristic DNA-binding or other characteristic TF domains and if annotations of matching proteins obtained by BLAST searches were consistent with such a classification. TF families previously identified in plants are presented in the first part of the table while potentially novel plant TF families, which were identified by the presence of domains associated with TFs and other transcriptional regulators outside the plant kingdom, are presented in the latter part of the table. D = DNA binding domain; P = protein-protein interaction domain; NA = nucleic acid (DNA and RNA) binding domain; RD = receiver domain; LBD = ligand binding; transcriptional co-activator. Plant-specific TF families and sub-families are indicated in bold (according to [12])

Kakar et al. Plant Methods 2008 4:18   doi:10.1186/1746-4811-4-18