RLMN_HELMI
ID RLMN_HELMI Reviewed; 385 AA.
AC B0TGT1;
DT 02-SEP-2008, integrated into UniProtKB/Swiss-Prot.
DT 08-APR-2008, sequence version 1.
DT 03-AUG-2022, entry version 79.
DE RecName: Full=Probable dual-specificity RNA methyltransferase RlmN {ECO:0000255|HAMAP-Rule:MF_01849};
DE EC=2.1.1.192 {ECO:0000255|HAMAP-Rule:MF_01849};
DE AltName: Full=23S rRNA (adenine(2503)-C(2))-methyltransferase {ECO:0000255|HAMAP-Rule:MF_01849};
DE AltName: Full=23S rRNA m2A2503 methyltransferase {ECO:0000255|HAMAP-Rule:MF_01849};
DE AltName: Full=Ribosomal RNA large subunit methyltransferase N {ECO:0000255|HAMAP-Rule:MF_01849};
DE AltName: Full=tRNA (adenine(37)-C(2))-methyltransferase {ECO:0000255|HAMAP-Rule:MF_01849};
DE AltName: Full=tRNA m2A37 methyltransferase {ECO:0000255|HAMAP-Rule:MF_01849};
GN Name=rlmN {ECO:0000255|HAMAP-Rule:MF_01849}; OrderedLocusNames=Helmi_20670;
GN ORFNames=HM1_2136;
OS Heliobacterium modesticaldum (strain ATCC 51547 / Ice1).
OC Bacteria; Firmicutes; Clostridia; Eubacteriales; Heliobacteriaceae;
OC Heliomicrobium.
OX NCBI_TaxID=498761;
RN [1]
RP NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC STRAIN=ATCC 51547 / Ice1;
RX PubMed=18441057; DOI=10.1128/jb.00299-08;
RA Sattley W.M., Madigan M.T., Swingley W.D., Cheung P.C., Clocksin K.M.,
RA Conrad A.L., Dejesa L.C., Honchak B.M., Jung D.O., Karbach L.E.,
RA Kurdoglu A., Lahiri S., Mastrian S.D., Page L.E., Taylor H.L., Wang Z.T.,
RA Raymond J., Chen M., Blankenship R.E., Touchman J.W.;
RT "The genome of Heliobacterium modesticaldum, a phototrophic representative
RT of the Firmicutes containing the simplest photosynthetic apparatus.";
RL J. Bacteriol. 190:4687-4696(2008).
CC -!- FUNCTION: Specifically methylates position 2 of adenine 2503 in 23S
CC rRNA and position 2 of adenine 37 in tRNAs. {ECO:0000255|HAMAP-
CC Rule:MF_01849}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=adenosine(2503) in 23S rRNA + 2 reduced [2Fe-2S]-[ferredoxin]
CC + 2 S-adenosyl-L-methionine = 2-methyladenosine(2503) in 23S rRNA +
CC 5'-deoxyadenosine + L-methionine + 2 oxidized [2Fe-2S]-[ferredoxin] +
CC S-adenosyl-L-homocysteine; Xref=Rhea:RHEA:42916, Rhea:RHEA-
CC COMP:10000, Rhea:RHEA-COMP:10001, Rhea:RHEA-COMP:10152, Rhea:RHEA-
CC COMP:10282, ChEBI:CHEBI:17319, ChEBI:CHEBI:33737, ChEBI:CHEBI:33738,
CC ChEBI:CHEBI:57844, ChEBI:CHEBI:57856, ChEBI:CHEBI:59789,
CC ChEBI:CHEBI:74411, ChEBI:CHEBI:74497; EC=2.1.1.192;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01849};
CC -!- CATALYTIC ACTIVITY:
CC Reaction=adenosine(37) in tRNA + 2 reduced [2Fe-2S]-[ferredoxin] + 2 S-
CC adenosyl-L-methionine = 2-methyladenosine(37) in tRNA + 5'-
CC deoxyadenosine + L-methionine + 2 oxidized [2Fe-2S]-[ferredoxin] + S-
CC adenosyl-L-homocysteine; Xref=Rhea:RHEA:43332, Rhea:RHEA-COMP:10000,
CC Rhea:RHEA-COMP:10001, Rhea:RHEA-COMP:10162, Rhea:RHEA-COMP:10485,
CC ChEBI:CHEBI:17319, ChEBI:CHEBI:33737, ChEBI:CHEBI:33738,
CC ChEBI:CHEBI:57844, ChEBI:CHEBI:57856, ChEBI:CHEBI:59789,
CC ChEBI:CHEBI:74411, ChEBI:CHEBI:74497; EC=2.1.1.192;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01849};
CC -!- COFACTOR:
CC Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883;
CC Evidence={ECO:0000255|HAMAP-Rule:MF_01849};
CC Note=Binds 1 [4Fe-4S] cluster. The cluster is coordinated with 3
CC cysteines and an exchangeable S-adenosyl-L-methionine.
CC {ECO:0000255|HAMAP-Rule:MF_01849};
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|HAMAP-Rule:MF_01849}.
CC -!- MISCELLANEOUS: Reaction proceeds by a ping-pong mechanism involving
CC intermediate methylation of a conserved cysteine residue.
CC {ECO:0000255|HAMAP-Rule:MF_01849}.
CC -!- SIMILARITY: Belongs to the radical SAM superfamily. RlmN family.
CC {ECO:0000255|HAMAP-Rule:MF_01849}.
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DR EMBL; CP000930; ABZ84692.1; -; Genomic_DNA.
DR AlphaFoldDB; B0TGT1; -.
DR SMR; B0TGT1; -.
DR STRING; 498761.HM1_2136; -.
DR EnsemblBacteria; ABZ84692; ABZ84692; HM1_2136.
DR KEGG; hmo:HM1_2136; -.
DR eggNOG; COG0820; Bacteria.
DR HOGENOM; CLU_029101_2_0_9; -.
DR OMA; QVGCSLD; -.
DR Proteomes; UP000008550; Chromosome.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:UniProtKB-UniRule.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0070040; F:rRNA (adenine-C2-)-methyltransferase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0019843; F:rRNA binding; IEA:UniProtKB-UniRule.
DR GO; GO:0002935; F:tRNA (adenine-C2-)-methyltransferase activity; IEA:UniProtKB-UniRule.
DR GO; GO:0000049; F:tRNA binding; IEA:UniProtKB-UniRule.
DR GO; GO:0070475; P:rRNA base methylation; IEA:UniProtKB-UniRule.
DR Gene3D; 3.20.20.70; -; 1.
DR HAMAP; MF_01849; RNA_methyltr_RlmN; 1.
DR InterPro; IPR013785; Aldolase_TIM.
DR InterPro; IPR040072; Methyltransferase_A.
DR InterPro; IPR027492; RNA_MTrfase_RlmN.
DR InterPro; IPR004383; rRNA_lsu_MTrfase_RlmN/Cfr.
DR InterPro; IPR007197; rSAM.
DR PANTHER; PTHR30544; PTHR30544; 1.
DR Pfam; PF04055; Radical_SAM; 1.
DR PIRSF; PIRSF006004; CHP00048; 1.
DR SFLD; SFLDF00275; adenosine_C2_methyltransferase; 1.
DR TIGRFAMs; TIGR00048; rRNA_mod_RlmN; 1.
DR PROSITE; PS51918; RADICAL_SAM; 1.
PE 3: Inferred from homology;
KW 4Fe-4S; Cytoplasm; Disulfide bond; Iron; Iron-sulfur; Metal-binding;
KW Methyltransferase; Reference proteome; rRNA processing;
KW S-adenosyl-L-methionine; Transferase; tRNA processing.
FT CHAIN 1..385
FT /note="Probable dual-specificity RNA methyltransferase
FT RlmN"
FT /id="PRO_0000350212"
FT DOMAIN 132..367
FT /note="Radical SAM core"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01266"
FT REGION 1..35
FT /note="Disordered"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT COMPBIAS 1..31
FT /note="Basic and acidic residues"
FT /evidence="ECO:0000256|SAM:MobiDB-lite"
FT ACT_SITE 121
FT /note="Proton acceptor"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01849"
FT ACT_SITE 372
FT /note="S-methylcysteine intermediate"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01849"
FT BINDING 146
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_note="4Fe-4S-S-AdoMet"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01849"
FT BINDING 150
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_note="4Fe-4S-S-AdoMet"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01849"
FT BINDING 153
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_note="4Fe-4S-S-AdoMet"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01849"
FT BINDING 198..199
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01849"
FT BINDING 230
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01849"
FT BINDING 253..255
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01849"
FT BINDING 329
FT /ligand="S-adenosyl-L-methionine"
FT /ligand_id="ChEBI:CHEBI:59789"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01849"
FT DISULFID 139..372
FT /note="(transient)"
FT /evidence="ECO:0000255|HAMAP-Rule:MF_01849"
SQ SEQUENCE 385 AA; 43869 MW; 6115FE432B8D4512 CRC64;
MNVKEPAEEA AIQLRTERQR IEPEGEEQSE QPTDLRGLFP EEIAALLTPW GQPTFRGKQI
FKWLQNRAVR EVAEMTDLPQ ALRVRLGEAG WLKPLAPERH RVARDGTEKY LWRLADGELI
ESVLMPYRRA QTRDRVTVCL STQAGCPLSC RFCATGRQGF RRNLTAAEIV GQVLDITHEK
RKDDPDFKVT NLVFMGMGEP FLNYDNVRRA IGLFTHPEGQ AIGQRRITVS TAGIVPGIDR
FADEDWEVNL ALSLHAADDK QRSEWMPVND RFPLAQVLEA CRRYWEKTRR RLSVEYALMA
GVNDRLEDAR RLASLFKGWP IHLNLIPVNA VAGIGVRRPE REPTERFLAE LRRWGVDAVI
REERGQDIEA ACGQLRGAAK GEEEA
