Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

ChainsTypeFamily Name Domain Identifier Family IdentifierProvenance Source (Version)
ASCOP2B SuperfamilySMAD MH1 domain8083640 3001158 SCOP2B (2022-06-29)
BSCOP2 FamilySMAD MH1 domain8083639 4002374 SCOP2 (2022-06-29)
BSCOP2 SuperfamilySMAD MH1 domain8083640 3001158 SCOP2 (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

ChainsFamily NameDomain Identifier ArchitecturePossible HomologyHomologyTopologyFamilyProvenance Source (Version)
APF03165e5mf0A1 A: few secondary structure elementsX: His-Me finger endonucleases (From Homology)H: His-Me finger endonucleasesT: His-Me finger endonucleasesF: PF03165ECOD (1.6)
BPF03165e5mf0B1 A: few secondary structure elementsX: His-Me finger endonucleases (From Homology)H: His-Me finger endonucleasesT: His-Me finger endonucleasesF: PF03165ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

ChainDomainClassArchitectureTopologyHomologyProvenance Source (Version)
A3.90.520.10 Alpha Beta Alpha-Beta Complex Smad3 Chain ACATH (4.3.0)
B3.90.520.10 Alpha Beta Alpha-Beta Complex Smad3 Chain ACATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

ChainsAccessionNameDescriptionCommentsSource
A, B
PF03165MH1 domain (MH1)MH1 domainThe MH1 (MAD homology 1) domain is found at the amino terminus of MAD related proteins such as Smads. This domain is separated from the MH2 domain by a non-conserved linker region. The crystal structure of the MH1 domain shows that a highly conserved ...The MH1 (MAD homology 1) domain is found at the amino terminus of MAD related proteins such as Smads. This domain is separated from the MH2 domain by a non-conserved linker region. The crystal structure of the MH1 domain shows that a highly conserved 11 residue beta hairpin is used to bind the DNA consensus sequence GNCN in the major groove, shown to be vital for the transcriptional activation of target genes. Not all examples of MH1 can bind to DNA however. Smad2 cannot bind DNA and has a large insertion within the hairpin that presumably abolishes DNA binding. A basic helix (H2) in MH1 with the nuclear localisation signal KKLKK has been shown to be essential for Smad3 nuclear import. Smads also use the MH1 domain to interact with transcription factors such as Jun, TFE3, Sp1, and Runx [1,3].
Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

ChainsPolymerMolecular FunctionBiological ProcessCellular Component
A, B
MH1 domain of human Smad4
C [auth E],
D [auth F]
DNA (5'-D(P*AP*CP*GP*GP*GP*CP*CP*GP*CP*GP*GP*CP*CP*CP*GP*T)-3')---

Pharos: Disease Associations Pharos Homepage Annotation

ChainsDrug Target  Associated Disease
A, B
PharosQ13485