Annotations: 1SQG

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

Chains	Domain Info	Class	Fold	Superfamily	Family	Domain	Species	Provenance Source (Version)
A	d1sqga1	All alpha proteins	NusB-like	NusB-like	RmsB N-terminal domain-like	Ribosomal RNA small subunit methyltransferase B, RsmB (Sun, Fmu/Fmv), N-terminal domain	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)
A	d1sqga2	Alpha and beta proteins (a/b)	S-adenosyl-L-methionine-dependent methyltransferases	S-adenosyl-L-methionine-dependent methyltransferases	NOL1/NOP2/sun	Ribosomal RNA small subunit methyltransferase B, RsmB (Sun, Fmu/Fmv), C-terminal domain	(Escherichia coli ) [TaxId: 562 ],	SCOPe (2.08)

Domain Annotation: SCOP2 Classification SCOP2 Database Homepage

Chains	Type	Family Name	Domain Identifier	Family Identifier	Provenance Source (Version)
A	SCOP2 Family	RmsB N-terminal domain-like	8027309	4002586	SCOP2 (2022-06-29)
A	SCOP2 Family	NOL1/NOP2/sun	8027310	4001157	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	NusB-like	8039688	3000679	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	S-adenosyl-L-methionine-dependent methyltransferases	8039689	3000118	SCOP2 (2022-06-29)
A	SCOP2 Superfamily	RNA-binding domain, RBD	8090696	3000110	SCOP2 (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		e1sqgA1	A: gene 59 helicase assembly protein	X: gene 59 helicase assembly protein	H: gene 59 helicase assembly protein	T:	F:	ECOD (20:10:01)
A		e1sqgA3	A: jelly-roll	X: Double-stranded beta-helix	H: Double-stranded beta-helix	T: RsmF-B_ferredox	F:	ECOD (20:10:01)
A		e1sqgA4	A: jelly-roll	X: Double-stranded beta-helix	H: Double-stranded beta-helix	T: Pirin_C_2	F:	ECOD (20:10:01)

Domain Annotation: CATH CATH Database Homepage

Chain	Domain	Class	Architecture	Topology	Homology	Provenance Source (Version)
A	1.10.940.10	Mainly Alpha	Orthogonal Bundle	N-utilizing Substance Protein B Homolog	Chain A	CATH (4.3.0)
A	1.10.287.730	Mainly Alpha	Orthogonal Bundle	Helix Hairpins	Helix hairpin bin	CATH (4.3.0)
A	3.30.70.1170	Alpha Beta	2-Layer Sandwich	Alpha-Beta Plaits	Sun protein	CATH (4.3.0)
A	3.40.50.150	Alpha Beta	3-Layer(aba) Sandwich	Rossmann fold	Vaccinia Virus protein VP39	CATH (4.3.0)

Protein Family Annotation Pfam Database Homepage

Chains	Accession	Name	Description	Comments	Source
A	PF01029	NusB family (NusB)	NusB family	The NusB protein is involved in the regulation of rRNA biosynthesis by transcriptional antitermination.	Domain
A	PF01189	16S rRNA methyltransferase RsmB/F (Methyltr_RsmB-F)	16S rRNA methyltransferase RsmB/F	This is the catalytic core of this SAM-dependent 16S ribosomal methyltransferase RsmB/F enzyme [1,2]. There is a catalytic cysteine residue at 180 in UniProtKB:Q5SII2, with another highly conserved cysteine at residue 230. It methylates the C(5) posi ...	This is the catalytic core of this SAM-dependent 16S ribosomal methyltransferase RsmB/F enzyme [1,2]. There is a catalytic cysteine residue at 180 in UniProtKB:Q5SII2, with another highly conserved cysteine at residue 230. It methylates the C(5) position of cytosine 2870 (m5C2870) in 25S rRNA [1,2].	Domain
A	PF22458	Methyltr_RsmF/B-like, ferredoxin-like domain (RsmF-B_ferredox)	Methyltr_RsmF/B-like, ferredoxin-like domain	This entry represents a ferredoxin-like domain found in methyltransferases RsmB, RsmF and related sequences [1-5].	Domain

Gene Ontology: Gene Product Annotation Gene Ontology Database Homepage

Chains	Polymer	Molecular Function	Biological Process	Cellular Component
A	SUN protein	RNA methyltransferase activity rRNA methyltransferase activity catalytic activity, acting on RNA transferase activity, transferring one-carbon groups catalytic activity, acting on a nucleic acid transferase activity catalytic activity, acting on a rRNA S-adenosylmethionine-dependent methyltransferase activity C-methyltransferase activity methyltransferase activity catalytic activity rRNA (cytosine) methyltransferase activity rRNA (cytosine-C5-)-methyltransferase activity RNA binding RNA methyltransferase activity rRNA methyltransferase activity catalytic activity, acting on RNA transferase activity, transferring one-carbon groups catalytic activity, acting on a nucleic acid transferase activity catalytic activity, acting on a rRNA S-adenosylmethionine-dependent methyltransferase activity C-methyltransferase activity methyltransferase activity catalytic activity rRNA (cytosine) methyltransferase activity rRNA (cytosine-C5-)-methyltransferase activity RNA binding binding nucleic acid binding	regulation of cellular process RNA metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of biological process biological regulation primary metabolic process regulation of cellular process RNA metabolic process regulation of primary metabolic process nucleobase-containing compound metabolic process RNA biosynthetic process nucleic acid biosynthetic process DNA-templated transcription regulation of RNA metabolic process regulation of nucleobase-containing compound metabolic process regulation of RNA biosynthetic process regulation of biosynthetic process regulation of biological process biological regulation primary metabolic process regulation of macromolecule metabolic process nucleobase-containing compound biosynthetic process gene expression macromolecule biosynthetic process nucleic acid metabolic process regulation of gene expression biosynthetic process cellular process metabolic process regulation of macromolecule biosynthetic process regulation of DNA-templated transcription macromolecule metabolic process regulation of metabolic process ribonucleoprotein complex biogenesis rRNA methylation rRNA processing rRNA modification cellular component biogenesis ribosome biogenesis cellular component organization or biogenesis RNA processing rRNA metabolic process macromolecule methylation RNA modification methylation macromolecule modification rRNA base methylation RNA methylation	cellular anatomical structure intracellular anatomical structure cytoplasm cytosol

InterPro: Protein Family Classification InterPro Database Homepage

Chains	Accession	Name	Type
A	IPR054728	Ribosomal RNA small subunit methyltransferase B-like, ferredoxin-like domain	Domain
A	IPR035926	NusB-like superfamily	Homologous Superfamily
A	IPR018314	RsmB/NOL1/NOP2-like, conserved site	Conserved Site
A	IPR001678	SAM-dependent methyltransferase RsmB-F/NOP2-type domain	Domain
A	IPR029063	S-adenosyl-L-methionine-dependent methyltransferase superfamily	Homologous Superfamily
A	IPR023267	RNA (C5-cytosine) methyltransferase	Family
A	IPR048019	Ribosomal RNA small subunit methyltransferase B-like, N-terminal domain	Domain
A	IPR006027	NusB/RsmB/TIM44	Domain
A	IPR049560	SAM-dependent methyltransferase RsmB-F/NOP2-type, catalytic core	Domain
A	IPR004573	rRNA small subunit methyltransferase B	Family
A	IPR023541	rRNA small subunit methyltransferase B, enterobacteriaceae	Family

RCSB PDB Core Operations are funded by the U.S. National Science Foundation (DBI-2321666), 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 R01GM157729. RCSB PDB uses resources of the National Energy Research Scientific Computing Center (NERSC), a Department of Energy User Facility.