3WKS

Crystal structure of the SepCysS-SepCysE N-terminal domain complex from

External Resource: Annotation

Domain Annotation: SCOP/SCOPe Classification
Domain Annotation: SCOP2 Classification
Domain Annotation: ECOD Classification
Domain Annotation: CATH
Protein Family Annotation
Gene Ontology: Gene Product Annotation
InterPro: Protein Family Classification
Protein Modification Annotation

Domain Annotation: SCOP/SCOPe Classification SCOP-e Database Homepage

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d3wksa1	Alpha and beta proteins (a/b)	PLP-dependent transferase-like	PLP-dependent transferases	automated matches	automated matches	(Methanocaldococcus jannaschii DSM 2661 ) [TaxId: 243232 ],	SCOPe (2.08)
A	d3wksa2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Methanocaldococcus jannaschii DSM 2661 ) [TaxId: 243232 ],	SCOPe (2.08)
B	d3wksb1	Alpha and beta proteins (a/b)	PLP-dependent transferase-like	PLP-dependent transferases	automated matches	automated matches	(Methanocaldococcus jannaschii DSM 2661 ) [TaxId: 243232 ],	SCOPe (2.08)
B	d3wksb2	Artifacts	Tags	Tags	Tags	N-terminal Tags	(Methanocaldococcus jannaschii DSM 2661 ) [TaxId: 243232 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
C	SCOP2B Superfamily	MJ1481 dimerisation domain-like	8091696	3002536	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	MJ1481 dimerisation domain-like	8091696	3002536	SCOP2B (2022-06-29)

Domain Annotation: ECOD Classification ECOD Database Homepage

Chains	Family Name	Domain Identifier	Architecture	Possible Homology	Homology	Topology	Family	Provenance Source (Version)
A	SepSecS	e3wksA2	A: a+b two layers	X: C-terminal domain in some PLP-dependent transferases (From Topology)	H: C-terminal domain in some PLP-dependent transferases (From Topology)	T: C-terminal domain in some PLP-dependent transferases	F: SepSecS	ECOD (1.6)
A	Aminotran_5_N	e3wksA1	A: a/b three-layered sandwiches	X: PLP-dependent transferases (From Topology)	H: PLP-dependent transferases (From Topology)	T: PLP-dependent transferases	F: Aminotran_5_N	ECOD (1.6)
B	SepSecS	e3wksB2	A: a+b two layers	X: C-terminal domain in some PLP-dependent transferases (From Topology)	H: C-terminal domain in some PLP-dependent transferases (From Topology)	T: C-terminal domain in some PLP-dependent transferases	F: SepSecS	ECOD (1.6)
B	Aminotran_5_N	e3wksB1	A: a/b three-layered sandwiches	X: PLP-dependent transferases (From Topology)	H: PLP-dependent transferases (From Topology)	T: PLP-dependent transferases	F: Aminotran_5_N	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.90.1150.10	Alpha Beta	Alpha-Beta Complex	Aspartate Aminotransferase, domain 1	Aspartate Aminotransferase, domain 1	CATH (4.3.0)
A	3.40.640.10	Alpha Beta	3-Layer(aba) Sandwich	Aspartate Aminotransferase	domain 2	CATH (4.3.0)
B	3.90.1150.10	Alpha Beta	Alpha-Beta Complex	Aspartate Aminotransferase, domain 1	Aspartate Aminotransferase, domain 1	CATH (4.3.0)
B	3.40.640.10	Alpha Beta	3-Layer(aba) Sandwich	Aspartate Aminotransferase	domain 2	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B	PF05889	O-phosphoseryl-tRNA(Sec) selenium transferase, SepSecS (SepSecS)	O-phosphoseryl-tRNA(Sec) selenium transferase, SepSecS	Early annotation suggested this family, SepSecS, of several eukaryotic and archaeal proteins, was involved in antigen-antibodies responses in the liver and pancreas [1,2]. Structural studies show that the family is O-phosphoseryl-tRNA(Sec) selenium t ...	Early annotation suggested this family, SepSecS, of several eukaryotic and archaeal proteins, was involved in antigen-antibodies responses in the liver and pancreas [1,2]. Structural studies show that the family is O-phosphoseryl-tRNA(Sec) selenium transferase, an enzyme involved in the synthesis of the amino acid selenocysteine (Sec). Sec is the only amino acid whose biosynthesis occurs on its cognate transfer RNA (tRNA). SepSecS catalyses the final step in the formation of the amino acid [3,4,5,6]. The early observation that autoantibodies isolated from patients with type I autoimmune hepatitis targeted a ribonucleoprotein complex containing tRNASec led to the identification and characterisation of the archaeal and the human SepSecS [2]. SepSecS forms its own branch in the family of fold-type I pyridoxal phosphate (PLP) enzymes that goes back to the last universal common ancestor which explains why the archaeal sequences Swiss:Q8TXK0 and Swiss:Q8TYR3 are annotated as being pyridoxal phosphate-dependent enzymes.	Domain
C, D	PF09873	Uncharacterized protein conserved in archaea (DUF2100) (DUF2100)	Uncharacterized protein conserved in archaea (DUF2100)	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B	O-phospho-L-seryl-tRNA:Cys-tRNA synthase	Sep-tRNA:Cys-tRNA synthase activity catalytic activity, acting on RNA catalytic activity, acting on a nucleic acid catalytic activity, acting on a tRNA transferase activity transferase activity, transferring alkyl or aryl (other than methyl) groups catalytic activity	organonitrogen compound metabolic process cellular biosynthetic process cellular metabolic process organonitrogen compound biosynthetic process primary metabolic process translation gene expression macromolecule biosynthetic process organic substance metabolic process biosynthetic process organic substance biosynthetic process metabolic process cellular process protein metabolic process organonitrogen compound metabolic process cellular biosynthetic process cellular metabolic process organonitrogen compound biosynthetic process primary metabolic process translation gene expression macromolecule biosynthetic process organic substance metabolic process biosynthetic process organic substance biosynthetic process metabolic process cellular process protein metabolic process macromolecule metabolic process	-
C, D	Uncharacterized protein MJ1481	-	-	-

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B	IPR015424	Pyridoxal phosphate-dependent transferase	Homologous Superfamily
A, B	IPR015421	Pyridoxal phosphate-dependent transferase, major domain	Homologous Superfamily
A, B	IPR015422	Pyridoxal phosphate-dependent transferase, small domain	Homologous Superfamily
A, B	IPR008829	SepSecS/SepCysS family	Family
A, B	IPR013375	O-phosphoseryl-tRNA:Cys-tRNA synthase, archaea	Family
C, D	IPR016736	Uncharacterised protein MJ1481, archaea	Family

Protein Modification Annotation

Modified Residue(s)
Chain	Residue(s)	Description
A, B	LLP	Parent Component: LYS RESID: AA0119 PSI-MOD : N6-pyridoxal phosphate-L-lysine MOD:00128

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.