I-SMAD

I-SMAD or Inhibitor SMAD is a subclass of SMADs that are involved in the modulation of transforming growth factor beta ligands. This class includes SMAD6 and SMAD7. They compete with SMAD4 and consequently regulate the transcription of its gene products.

External links

I-Smad Proteins at the US National Library of Medicine Medical Subject Headings (MeSH)

Cell signaling: TGFβ signaling pathway

TGF beta superfamily of ligands

TGF beta family	TGF-β1 TGF-β2 TGF-β3

Bone morphogenetic proteins	BMP2 BMP3 BMP4 BMP5 BMP6 BMP7 BMP8a BMP8b BMP10 BMP15

Growth differentiation factors	GDF1 GDF2 GDF3 GDF5 GDF6 GDF7 Myostatin/GDF8 GDF9 GDF10 GDF11 GDF15

Other	Activin and inhibin Anti-müllerian hormone Nodal

TGF beta receptors
(Activin, BMP)

TGFBR1:	Activin type 1 receptors ACVR1 ACVR1B ACVR1C ACVRL1 BMPR1 BMPR1A BMPR1B

TGFBR2:	Activin type 2 receptors ACVR2A ACVR2B AMHR2 BMPR2

TGFBR3:	betaglycan

Transducers/SMAD

Ligand inhibitors

Coreceptors

BAMBI
Cripto

Other

SARA

Transcription factors and intracellular receptors

(1) Basic domains

(1.1) Basic leucine zipper (bZIP)	Activating transcription factor AATF 1 2 3 4 5 6 7 AP-1 c-Fos FOSB FOSL1 FOSL2 JDP2 c-Jun JUNB JunD BACH 1 2 BATF BLZF1 C/EBP α β γ δ ε ζ CREB 1 3 L1 CREM DBP DDIT3 GABPA HLF MAF B F G K NFE 2 L1 L2 L3 NFIL3 NRL NRF 1 2 3 XBP1

(1.2) Basic helix-loop-helix (bHLH)	ATOH1 AhR AHRR ARNT ASCL1 BHLH 2 3 9 ARNTL ARNTL ARNTL2 CLOCK EPAS1 FIGLA HAND 1 2 HES 5 6 HEY 1 2 L HES1 HIF 1A 3A ID 1 2 3 4 LYL1 MESP2 MXD4 MYCL1 MYCN Myogenic regulatory factors MyoD Myogenin MYF5 MYF6 Neurogenins 1 2 3 NeuroD 1 2 NPAS 1 2 3 OLIG 1 2 Pho4 Scleraxis SIM 1 2 TAL 1 2 Twist USF1

(1.3) bHLH-ZIP	AP-4 MAX MXD3 MITF MNT MLX MXI1 Myc SREBP 1 2

(1.4) NF-1	NFI A B C X SMAD R-SMAD 1 2 3 5 9 I-SMAD 6 7 4)

(1.5) RF-X	RFX 1 2 3 4 5 6 ANK

(1.6) Basic helix-span-helix (bHSH)	AP-2 α β γ δ ε

(2) Zinc finger DNA-binding domains

(2.1) Nuclear receptor (Cys₄)

subfamily 1	Thyroid hormone α β CAR FXR LXR α β PPAR α β/δ γ PXR RAR α β γ ROR α β γ Rev-ErbA α β VDR

subfamily 2	COUP-TF (I II Ear-2 HNF4 α γ PNR RXR α β γ Testicular receptor 2 4 TLX

subfamily 3	Steroid hormone Androgen Estrogen α β Glucocorticoid Mineralocorticoid Progesterone Estrogen related α β γ

subfamily 4	NUR NGFIB NOR1 NURR1

subfamily 5	LRH-1 SF1

subfamily 6	GCNF

subfamily 0	DAX1 SHP

(2.2) Other Cys₄

GATA
- 1
- 2
- 3
- 4
- 5
- 6
MTA
- 1
- 2
- 3
TRPS1

(2.3) Cys₂His₂

General transcription factors
- TFIIA
- TFIIB
- TFIID
- TFIIE
  - 1
  - 2
- TFIIF
- 1
- 2
  - TFIIH
  - 1
  - 2
  - 4
  - 2I
  - 3A
  - 3C1
  - 3C2

ATBF1
BCL
- 6
- 11A
- 11B
CTCF
E4F1
EGR
- 1
- 2
- 3
- 4
ERV3
GFI1
GLI-Krüppel family
- 1
- 2
- 3
- REST
- S1
- S2
- YY1
HIC
- 1
- 2
HIVEP
- 1
- 2
- 3
IKZF
- 1
- 2
- 3
ILF
- 2
- 3
KLF
- 1
- 2
- 3
- 4
- 5
- 6
- 7
- 8
- 9
- 10
- 11
- 12
- 13
- 14
- 15
- 17
MTF1
MYT1
OSR1
PRDM9
SALL
- 1
- 2
- 3
- 4
SP
- 1
- 2
- 4
- 7
- 8
TSHZ3
WT1
Zbtb7
- 7A
- 7B
ZBTB
- 11
- 16
- 17
- 20
- 32
- 33
- 40
zinc finger
- 3
- 7
- 9
- 10
- 19
- 22
- 24
- 33B
- 34
- 35
- 41
- 43
- 44
- 51
- 74
- 143
- 146
- 148
- 165
- 202
- 217
- 219
- 238
- 239
- 259
- 267
- 268
- 281
- 295
- 300
- 318
- 330
- 346
- 350
- 365
- 366
- 384
- 423
- 451
- 452
- 471
- 593
- 638
- 644
- 649
- 655

(2.4) Cys₆

HIVEP1

(2.5) Alternating composition

AIRE
DIDO1
GRLF1
ING
- 1
- 2
- 4
JARID
- 1A
- 1B
- 1C
- 1D
- 2
JMJD1B

(2.6) WRKY

WRKY

(3) Helix-turn-helix domains

(3.1) Homeodomain	ARX CDX 1 2 CRX CUTL1 DBX 1 2 DLX 3 4 5 EMX 1 2 EN 1 2 FHL 1 2 3 HESX1 HHEX HLX Homeobox A1 A2 A3 A4 A5 A7 A9 A10 A11 A13 B1 B2 B3 B4 B5 B6 B7 B8 B9 B13 C4 C5 C6 C8 C9 C10 C11 C12 C13 D1 D3 D4 D8 D9 D10 D11 D12 D13 HOPX IRX 1 2 3 4 5 6 MKX LMX 1A 1B MEIS 1 2 MEOX2 MNX1 MSX 1 2 NANOG NKX 2-1 2-2 2-3 2-5 3-1 3-2 6-1 6-2 NOBOX PBX 1 2 3 PHF 1 3 6 8 10 16 17 20 21A PHOX 2A 2B PITX 1 2 3 POU domain PIT-1 BRN-3: A B C Octamer transcription factor: 1 2 3/4 6 7 11 OTX 1 2 PDX1 SATB2 SHOX2 SIX 1 2 3 4 5 VAX1 ZEB 1 2

(3.2) Paired box	PAX 1 2 3 4 5 6 7 8 9 PRRX 1 2 RAX

(3.3) Fork head / winged helix	E2F 1 2 3 4 5 FOX proteins A1 A2 A3 C1 C2 D3 D4 E1 E3 F1 G1 H1 I1 J1 J2 K1 K2 L2 M1 N1 N3 O1 O3 O4 P1 P2 P3 P4

(3.4) Heat shock factors	HSF 1 2 4

(3.5) Tryptophan clusters	ELF 2 4 5 EGF ELK 1 3 4 ERF ETS 1 2 ERG SPIB ETV 1 4 5 6 FLI1 Interferon regulatory factors 1 2 3 4 5 6 7 8 MYB MYBL2

(3.6) TEA domain	transcriptional enhancer factor 1 2 3 4

(4) β-Scaffold factors with minor groove contacts

(4.1) Rel homology region	NF-κB NFKB1 NFKB2 REL RELA RELB NFAT C1 C2 C3 C4 5

(4.2) STAT	STAT 1 2 3 4 5 6

(4.3) p53	p53 TBX 1 2 3 5 19 21 22 TBR1 TBR2 TFT MYRF TP63

(4.4) MADS box	Mef2 A B C D SRF

(4.6) TATA-binding proteins	TBP TBPL1

(4.7) High-mobility group	BBX HMGB 1 2 3 4 HMGN 1 2 3 4 HNF 1A 1B LEF1 SOX 1 2 3 4 5 6 8 9 10 11 12 13 14 15 18 21 SRY SSRP1 TCF 3 4 TOX 1 2 3 4

(4.9) Grainyhead	TFCP2

(4.10) Cold-shock domain	CSDA YBX1

(4.11) Runt	CBF CBFA2T2 CBFA2T3 RUNX1 RUNX2 RUNX3 RUNX1T1

(0) Other transcription factors

(0.2) HMGI(Y)	HMGA 1 2 HBP1

(0.3) Pocket domain	Rb RBL1 RBL2

(0.5) AP-2/EREBP-related factors	Apetala 2 EREBP B3

(0.6) Miscellaneous	ARID 1A 1B 2 3A 3B 4A CAP IFI 16 35 MLL 2 3 T1 MNDA NFY A B C Rho/Sigma

see also transcription factor/coregulator deficiencies

TGFβ receptor superfamily modulators

Type I

ALK1 (ACVRL1)	Agonists: Activin (A, B, AB) Avotermin BMP (10) Cetermin GDF (2 (BMP9)) TGFβ (1, 2, 3) Antibodies: Ascrinvacumab Kinase inhibitors: K-02288 ML-347 (LDN-193719, VU0469381) Decoy receptors: Dalantercept Other inhibitors: Disitertide

ALK2 (ACVR1A)	Agonists: Activin (A, B, AB) AMH (MIS) Avotermin BMP (5, 6, 7, 8A, 8B) Eptotermin alfa TGFβ (1, 2, 3) Kinase inhibitors: DMH-1 DMH-2 Dorsomorphin (BML-275) K-02288 ML-347 (LDN-193719, VU0469381)

ALK3 (BMPR1A)	Agonists: AMH (MIS) BMP (2, 4, 5, 6, 7, 8A, 8B) Dibotermin alfa Eptotermin alfa Kinase inhibitors: DMH-2 Dorsomorphin (BML-275) K-02288

ALK4 (ACVR1B)	Agonists: Activin (A, B, AB) GDF (1, 3, 11 (BMP11)) Myostatin (GDF8) Nodal Antagonists: Inhibin (A, B) Lefty (1, 2) Kinase inhibitors: A 83-01 SB-431542 SB-505124

ALK5 (TGFβR1)	Agonists: Avotermin GDF (10 (BMP3B), 11 (BMP11)) TGFβ (1, 2, 3) Antibodies: Fresolimumab Lerdelimumab Metelimumab Kinase inhibitors: A 83-01 D-4476 GW-788388 LY-364947 LY-2109761 Galunisertib (LY-2157299) R-268712 RepSox (E-616452, SJN-2511) SB-431542 SB-505124 SB-525334 SD-208

ALK6 (BMPR1B)	Agonists: BMP (2, 4, 5, 6, 7, 8A, 8B, 15 (GDF9B)) Dibotermin alfa Eptotermin alfa GDF (5 (BMP14), 6 (BMP13), 7 (BMP12), 9, 15) Radotermin Kinase inhibitors: DMH-2 Dorsomorphin (BML-275) K-02288

ALK7 (ACVR1C)	Agonists: GDF (1, 3, 11 (BMP11)) Nodal Antagonists: Lefty (1, 2) Kinase inhibitors: A 83-01 SB-431542 SB-505124

Type II

TGFβR2	Agonists: Avotermin GDF (10 (BMP3B)) TGFβ (1, 2, 3) Antibodies: Fresolimumab Lerdelimumab Metelimumab Kinase inhibitors: DMH-2 LY-364947

BMPR2	Agonists: BMP (2, 4, 6, 7, 10) Dibotermin alfa Eptotermin alfa GDF (2 (BMP9), 5 (BMP14), 6 (BMP13), 7 (BMP12)) Radotermin Antagonists: Inhibin (A, B)

ACVR2A (ACVR2)	Agonists: Activin (A, B, AB) BMP (2, 4, 5, 6, 7, 8A, 8B, 15 (GDF9B)) Dibotermin alfa Eptotermin alfa GDF (1, 3, 5 (BMP14), 6 (BMP13), 7 (BMP12), 9, 11 (BMP11), 15) Myostatin (GDF8) Nodal Radotermin Antagonists: Inhibin (A, B) Lefty (1, 2) Decoy receptors: Sotatercept

ACVR2B	Agonists: Activin (A, B, AB) BMP (2, 4, 6, 7) Dibotermin alfa Eptotermin alfa GDF (1, 3, 5 (BMP14), 6 (BMP13), 7 (BMP12)) Myostatin (GDF8) Nodal Osteogenin (BMP3, BMP3A) Radotermin Antagonists: Inhibin (A, B) Lefty (1, 2) Decoy receptors: Ramatercept

AMHR2 (AMHR)	Agonists: AMH (MIS)

Type III

TGFβR3 (β-glycan)	Ligands: Avotermin Inhibin (A, B) TGFβ (1, 2, 3)

Unsorted

Endogenous antagonists/inhibitors: BAMBI
Cerberus (CER1)
Chordin
DAN (PARN)
Decorin
Follistatin
Gremlin (Drm)
LTBP1
Noggin
TGIF
Thrombospondin 1 (THBS1)
Tomoregulin 1

Antibodies: Stamulumab (against myostatin)
TRC105 (against endoglin)

Others: Endoglin

See also: Growth factor receptor modulators
Cytokine receptor modulators
Peptide receptor modulators

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I-SMAD

See also

External links