Annotations: 3SQN

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
B	Mga	e3sqnB2	A: alpha arrays	X: HTH	H: HTH	T: winged	F: Mga	ECOD (1.6)
B	EUF08044	e3sqnB4	A: alpha bundles	X: PTS-regulatory domain, PRD (From Topology)	H: PTS-regulatory domain, PRD (From Topology)	T: PTS-regulatory domain, PRD	F: EUF08044	ECOD (1.6)
B	EUF08045	e3sqnB3	A: alpha bundles	X: PTS-regulatory domain, PRD (From Topology)	H: PTS-regulatory domain, PRD (From Topology)	T: PTS-regulatory domain, PRD	F: EUF08045	ECOD (1.6)
B	PTS_IIB_2	e3sqnB1	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Flavoproteins/Phosphotyrosine protein phosphatases-like	T: Phosphotyrosine protein phosphatases I-like	F: PTS_IIB_2	ECOD (1.6)
A	HTH_Mga	e3sqnA2	A: alpha arrays	X: HTH	H: HTH	T: winged	F: HTH_Mga	ECOD (1.6)
A	Mga	e3sqnA3	A: alpha arrays	X: HTH	H: HTH	T: winged	F: Mga	ECOD (1.6)
A	EUF08044	e3sqnA5	A: alpha bundles	X: PTS-regulatory domain, PRD (From Topology)	H: PTS-regulatory domain, PRD (From Topology)	T: PTS-regulatory domain, PRD	F: EUF08044	ECOD (1.6)
A	EUF08045	e3sqnA4	A: alpha bundles	X: PTS-regulatory domain, PRD (From Topology)	H: PTS-regulatory domain, PRD (From Topology)	T: PTS-regulatory domain, PRD	F: EUF08045	ECOD (1.6)
A	PTS_IIB_2	e3sqnA1	A: a/b three-layered sandwiches	X: Flavodoxin-like	H: Flavoproteins/Phosphotyrosine protein phosphatases-like	T: Phosphotyrosine protein phosphatases I-like	F: PTS_IIB_2	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
B	1.10.10.10	Mainly Alpha	Orthogonal Bundle	Arc Repressor Mutant, subunit A	Winged helix-like DNA-binding domain superfamily/Winged helix DNA-binding domain	CATH (4.3.0)
B	1.10.1790.40	Mainly Alpha	Orthogonal Bundle	PTS-regulatory domain, PRD		CATH (4.3.0)
B	1.10.1790.30	Mainly Alpha	Orthogonal Bundle	PTS-regulatory domain, PRD		CATH (4.3.0)
B	3.40.50.2300	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Response regulator	CATH (4.3.0)
A	1.10.1790.40	Mainly Alpha	Orthogonal Bundle	PTS-regulatory domain, PRD		CATH (4.3.0)
A	1.10.1790.30	Mainly Alpha	Orthogonal Bundle	PTS-regulatory domain, PRD		CATH (4.3.0)
A	3.40.50.2300	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Response regulator	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF18333	Non-canonical single-stranded DNA-binding domain (ssDNA_DBD)	Non-canonical single-stranded DNA-binding domain	This domain is found in ThermoDBP, a non-canonical single-stranded DNA-binding protein in Thermoproteales. Single-stranded DNA-binding proteins are needed for DNA metabolism, sequestering and protecting transiently formed ssDNA during DNA replication ...	This domain is found in ThermoDBP, a non-canonical single-stranded DNA-binding protein in Thermoproteales. Single-stranded DNA-binding proteins are needed for DNA metabolism, sequestering and protecting transiently formed ssDNA during DNA replication and recombination, detecting DNA damage and recruiting repair proteins. The outer edge of the ssDNA-binding cleft, formed by this domain, has a strongly positive electrostatic surface potential because of the conserved basic residues R49, K54, R65, R80, R86, R90, K97, and R112 [1].	Domain
A, B	PF05043	Mga helix-turn-helix domain (Mga)	Mga helix-turn-helix domain	M regulator protein trans-acting positive regulator (Mga) is a DNA-binding protein that activates the expression of several important virulence genes in group A streptococcus in response to changing environmental conditions [1]. This domain is found ...	M regulator protein trans-acting positive regulator (Mga) is a DNA-binding protein that activates the expression of several important virulence genes in group A streptococcus in response to changing environmental conditions [1]. This domain is found in the centre of the Mga proteins. This family also contains a number of bacterial RofA transcriptional regulators that seem to be largely restricted to streptococci. These proteins have been shown to regulate the expression of important bacterial adhesins [2]. This is presumably a DNA-binding domain.	Domain
A, B	PF08280	M protein trans-acting positive regulator (MGA) HTH domain (HTH_Mga)	M protein trans-acting positive regulator (MGA) HTH domain	Mga is a DNA-binding protein that activates the expression of several important virulence genes in group A streptococcus in response to changing environmental conditions [1].	Domain

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR013199	M protein trans-acting positive regulator (MGA) HTH domain	Domain
A, B	IPR007737	Mga helix-turn-helix domain	Domain
A, B	IPR036388	Winged helix-like DNA-binding domain superfamily	Homologous Superfamily

RCSB PDB Core Operations are funded by the National Science Foundation (DBI-1832184), the US Department of Energy (DE-SC0019749), and the National Cancer Institute, National Institute of Allergy and Infectious Diseases, and National Institute of General Medical Sciences of the National Institutes of Health under grant R01GM133198.