1FWK

CRYSTAL STRUCTURE OF HOMOSERINE KINASE COMPLEXED WITH ADP

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
Structure Motif: Primary M-CSA Annotation

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1fwka1	Alpha and beta proteins (a+b)	Ribosomal protein S5 domain 2-like	Ribosomal protein S5 domain 2-like	GHMP Kinase, N-terminal domain	Homoserine kinase	(Methanocaldococcus jannaschii ) [TaxId: 2190 ],	SCOPe (2.08)
A	d1fwka2	Alpha and beta proteins (a+b)	Ferredoxin-like	GHMP Kinase, C-terminal domain	Homoserine kinase	Homoserine kinase	(Methanocaldococcus jannaschii ) [TaxId: 2190 ],	SCOPe (2.08)
B	d1fwkb1	Alpha and beta proteins (a+b)	Ribosomal protein S5 domain 2-like	Ribosomal protein S5 domain 2-like	GHMP Kinase, N-terminal domain	Homoserine kinase	(Methanocaldococcus jannaschii ) [TaxId: 2190 ],	SCOPe (2.08)
B	d1fwkb2	Alpha and beta proteins (a+b)	Ferredoxin-like	GHMP Kinase, C-terminal domain	Homoserine kinase	Homoserine kinase	(Methanocaldococcus jannaschii ) [TaxId: 2190 ],	SCOPe (2.08)
C	d1fwkc1	Alpha and beta proteins (a+b)	Ribosomal protein S5 domain 2-like	Ribosomal protein S5 domain 2-like	GHMP Kinase, N-terminal domain	Homoserine kinase	(Methanocaldococcus jannaschii ) [TaxId: 2190 ],	SCOPe (2.08)
C	d1fwkc2	Alpha and beta proteins (a+b)	Ferredoxin-like	GHMP Kinase, C-terminal domain	Homoserine kinase	Homoserine kinase	(Methanocaldococcus jannaschii ) [TaxId: 2190 ],	SCOPe (2.08)
D	d1fwkd1	Alpha and beta proteins (a+b)	Ribosomal protein S5 domain 2-like	Ribosomal protein S5 domain 2-like	GHMP Kinase, N-terminal domain	Homoserine kinase	(Methanocaldococcus jannaschii ) [TaxId: 2190 ],	SCOPe (2.08)
D	d1fwkd2	Alpha and beta proteins (a+b)	Ferredoxin-like	GHMP Kinase, C-terminal domain	Homoserine kinase	Homoserine kinase	(Methanocaldococcus jannaschii ) [TaxId: 2190 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2B Superfamily	Ribosomal protein S5 domain 2-like	8032983	3000100	SCOP2B (2022-06-29)
A	SCOP2B Superfamily	GHMP Kinase C-terminal domain	8032985	3001245	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	GHMP Kinase C-terminal domain	8032985	3001245	SCOP2B (2022-06-29)
B	SCOP2B Superfamily	Ribosomal protein S5 domain 2-like	8032983	3000100	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	GHMP Kinase C-terminal domain	8032985	3001245	SCOP2B (2022-06-29)
C	SCOP2B Superfamily	Ribosomal protein S5 domain 2-like	8032983	3000100	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	Ribosomal protein S5 domain 2-like	8032983	3000100	SCOP2B (2022-06-29)
D	SCOP2B Superfamily	GHMP Kinase C-terminal domain	8032985	3001245	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	PF00288	e1fwkA2	A: a+b two layers	X: Ribosomal protein S5 domain 2-like (From Topology)	H: Ribosomal protein S5 domain 2-like (From Topology)	T: Ribosomal protein S5 domain 2-like	F: PF00288	ECOD (1.6)
A	PF08544	e1fwkA1	A: a+b two layers	X: Alpha-beta plaits	H: GHMP Kinase, C-terminal domain (From Topology)	T: GHMP Kinase, C-terminal domain	F: PF08544	ECOD (1.6)
B	PF00288	e1fwkB2	A: a+b two layers	X: Ribosomal protein S5 domain 2-like (From Topology)	H: Ribosomal protein S5 domain 2-like (From Topology)	T: Ribosomal protein S5 domain 2-like	F: PF00288	ECOD (1.6)
B	PF08544	e1fwkB1	A: a+b two layers	X: Alpha-beta plaits	H: GHMP Kinase, C-terminal domain (From Topology)	T: GHMP Kinase, C-terminal domain	F: PF08544	ECOD (1.6)
C	PF00288	e1fwkC2	A: a+b two layers	X: Ribosomal protein S5 domain 2-like (From Topology)	H: Ribosomal protein S5 domain 2-like (From Topology)	T: Ribosomal protein S5 domain 2-like	F: PF00288	ECOD (1.6)
C	PF08544	e1fwkC1	A: a+b two layers	X: Alpha-beta plaits	H: GHMP Kinase, C-terminal domain (From Topology)	T: GHMP Kinase, C-terminal domain	F: PF08544	ECOD (1.6)
D	PF00288	e1fwkD2	A: a+b two layers	X: Ribosomal protein S5 domain 2-like (From Topology)	H: Ribosomal protein S5 domain 2-like (From Topology)	T: Ribosomal protein S5 domain 2-like	F: PF00288	ECOD (1.6)
D	PF08544	e1fwkD1	A: a+b two layers	X: Alpha-beta plaits	H: GHMP Kinase, C-terminal domain (From Topology)	T: GHMP Kinase, C-terminal domain	F: PF08544	ECOD (1.6)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	3.30.230.10	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S5	domain 2	CATH (4.3.0)
A	3.30.70.890	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	GHMP kinase, C-terminal domain	CATH (4.3.0)
B	3.30.230.10	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S5	domain 2	CATH (4.3.0)
B	3.30.70.890	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	GHMP kinase, C-terminal domain	CATH (4.3.0)
C	3.30.230.10	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S5	domain 2	CATH (4.3.0)
C	3.30.70.890	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	GHMP kinase, C-terminal domain	CATH (4.3.0)
D	3.30.230.10	Alpha Beta	2-Layer Sandwich	Ribosomal Protein S5	domain 2	CATH (4.3.0)
D	3.30.70.890	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	GHMP kinase, C-terminal domain	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A, B, C, D	PF08544	GHMP kinases C terminal (GHMP_kinases_C)	GHMP kinases C terminal	-	Family
A, B, C, D	PF00288	GHMP kinases N terminal domain (GHMP_kinases_N)	GHMP kinases N terminal domain	-	Family

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A, B, C, D	HOMOSERINE KINASE	binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding binding adenyl ribonucleotide binding nucleotide binding purine ribonucleotide binding purine ribonucleoside triphosphate binding nucleoside phosphate binding ion binding purine nucleotide binding organic cyclic compound binding anion binding adenyl nucleotide binding ATP binding heterocyclic compound binding carbohydrate derivative binding ribonucleotide binding small molecule binding amino acid kinase activity homoserine kinase activity kinase activity transferase activity catalytic activity phosphotransferase activity, alcohol group as acceptor transferase activity, transferring phosphorus-containing groups	phosphorylation cellular metabolic process phosphate-containing compound metabolic process metabolic process cellular process phosphorus metabolic process oxoacid metabolic process cellular biosynthetic process aspartate family amino acid biosynthetic process organonitrogen compound biosynthetic process aspartate family amino acid metabolic process amino acid metabolic process organic acid metabolic process organic acid biosynthetic process phosphorylation cellular metabolic process phosphate-containing compound metabolic process metabolic process cellular process phosphorus metabolic process oxoacid metabolic process cellular biosynthetic process aspartate family amino acid biosynthetic process organonitrogen compound biosynthetic process aspartate family amino acid metabolic process amino acid metabolic process organic acid metabolic process organic acid biosynthetic process alpha-amino acid metabolic process carboxylic acid biosynthetic process organic substance metabolic process organic substance biosynthetic process threonine metabolic process small molecule metabolic process organonitrogen compound metabolic process small molecule biosynthetic process carboxylic acid metabolic process L-amino acid biosynthetic process primary metabolic process L-amino acid metabolic process proteinogenic amino acid metabolic process amino acid biosynthetic process biosynthetic process threonine biosynthetic process proteinogenic amino acid biosynthetic process alpha-amino acid biosynthetic process	intracellular anatomical structure cytoplasm cellular anatomical entity

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A, B, C, D	IPR000870	Homoserine kinase	Family
A, B, C, D	IPR006204	GHMP kinase N-terminal domain	Domain
A, B, C, D	IPR013750	GHMP kinase, C-terminal domain	Domain
A, B, C, D	IPR006203	GHMP kinase, ATP-binding, conserved site	Conserved Site
A, B, C, D	IPR020568	Ribosomal protein uS5 domain 2-type superfamily	Homologous Superfamily
A, B, C, D	IPR036554	GHMP kinase, C-terminal domain superfamily	Homologous Superfamily
A, B, C, D	IPR014721	Small ribosomal subunit protein uS5 domain 2-type fold, subgroup	Homologous Superfamily

Structure Motif Annotation: Mechanism and Catalytic Site Atlas M-CSA Database Homepage

Chains	Enzyme Name	Description	Catalytic Residues
C	homoserine kinase M-CSA #778	Homoserine kinase (HSK) belongs to a large superfamily of GHMP kinases. It catalyses the phosphorylation of L-homoserine to O-phospho-L-homoserine, the first reaction after the branching-point to methionine in the bacterial threonine biosynthetic pathway. Mevalonate kinase, Galactokinase and Phosphomevalonate kinase are also members of the GHMP kinase superfamily but have a different mechanism proposed involving an aspartate acting as an initiating general base. HSK lacks this catalytic aspartate so is proposed to proceed with direct phosphorylation.	Defined by 2 residues: GLU:C-126 [auth C-130]THR:C-179 [auth C-183] \| Explore in 3D: M-CSA Motif Definition Search M-CSA Motif EC: 2.7.1.39 (PDB Primary Data) Search M-CSA Motif + EC 2.7.1.39

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.