ID   TRMB_LIMF3              Reviewed;         215 AA.
AC   B2GDC8;
DT   14-APR-2009, integrated into UniProtKB/Swiss-Prot.
DT   10-JUN-2008, sequence version 1.
DT   04-NOV-2026, entry version 94.
DE   RecName: Full=tRNA (guanine-N(7)-)-methyltransferase {ECO:0000255|HAMAP-Rule:MF_01057};
DE            EC=2.1.1.33 {ECO:0000255|HAMAP-Rule:MF_01057};
DE   AltName: Full=tRNA (guanine(46)-N(7))-methyltransferase {ECO:0000255|HAMAP-Rule:MF_01057};
DE   AltName: Full=tRNA(m7G46)-methyltransferase {ECO:0000255|HAMAP-Rule:MF_01057};
GN   Name=trmB {ECO:0000255|HAMAP-Rule:MF_01057};
GN   OrderedLocusNames=LAF_1324;
OS   Limosilactobacillus fermentum (strain NBRC 3956 / LMG 18251) (Lactobacillus
OS   fermentum).
OC   Bacteria; Bacillati; Bacillota; Bacilli; Lactobacillales; Lactobacillaceae;
OC   Limosilactobacillus.
OX   NCBI_TaxID=334390;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RC   STRAIN=NBRC 3956 / LMG 18251;
RX   PubMed=18487258; DOI=10.1093/dnares/dsn009;
RA   Morita H., Toh H., Fukuda S., Horikawa H., Oshima K., Suzuki T.,
RA   Murakami M., Hisamatsu S., Kato Y., Takizawa T., Fukuoka H., Yoshimura T.,
RA   Itoh K., O'Sullivan D.J., McKay L.L., Ohno H., Kikuchi J., Masaoka T.,
RA   Hattori M.;
RT   "Comparative genome analysis of Lactobacillus reuteri and Lactobacillus
RT   fermentum reveal a genomic island for reuterin and cobalamin production.";
RL   DNA Res. 15:151-161(2008).
CC   -!- FUNCTION: Catalyzes the formation of N(7)-methylguanine at position 46
CC       (m7G46) in tRNA. {ECO:0000255|HAMAP-Rule:MF_01057}.
CC   -!- CATALYTIC ACTIVITY:
CC       Reaction=guanosine(46) in tRNA + S-adenosyl-L-methionine = N(7)-
CC         methylguanosine(46) in tRNA + S-adenosyl-L-homocysteine;
CC         Xref=Rhea:RHEA:42708, Rhea:RHEA-COMP:10188, Rhea:RHEA-COMP:10189,
CC         ChEBI:CHEBI:57856, ChEBI:CHEBI:59789, ChEBI:CHEBI:74269,
CC         ChEBI:CHEBI:74480; EC=2.1.1.33; Evidence={ECO:0000255|HAMAP-
CC         Rule:MF_01057};
CC   -!- PATHWAY: tRNA modification; N(7)-methylguanine-tRNA biosynthesis.
CC       {ECO:0000255|HAMAP-Rule:MF_01057}.
CC   -!- SIMILARITY: Belongs to the class I-like SAM-binding methyltransferase
CC       superfamily. TrmB family. {ECO:0000255|HAMAP-Rule:MF_01057}.
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DR   EMBL; AP008937; BAG27660.1; -; Genomic_DNA.
DR   RefSeq; WP_003683688.1; NC_010610.1.
DR   SMR; B2GDC8; -.
DR   GeneID; 305497930; -.
DR   KEGG; lfe:LAF_1324; -.
DR   eggNOG; COG0220; Bacteria.
DR   HOGENOM; CLU_050910_2_1_9; -.
DR   OMA; AADINCF; -.
DR   UniPathway; UPA00989; -.
DR   CDD; cd02440; AdoMet_MTases; 1.
DR   FunFam; 3.40.50.150:FF:000035; tRNA (guanine-N(7)-)-methyltransferase; 1.
DR   Gene3D; 3.40.50.150; Vaccinia Virus protein VP39; 1.
DR   HAMAP; MF_01057; tRNA_methyltr_TrmB; 1.
DR   InterPro; IPR029063; SAM-dependent_MTases_sf.
DR   InterPro; IPR003358; tRNA_(Gua-N-7)_MeTrfase_Trmb.
DR   InterPro; IPR055361; tRNA_methyltr_TrmB_bact.
DR   PANTHER; PTHR23417; 3-DEOXY-D-MANNO-OCTULOSONIC-ACID TRANSFERASE/TRNA GUANINE-N 7 - -METHYLTRANSFERASE; 1.
DR   PANTHER; PTHR23417:SF14; PENTACOTRIPEPTIDE-REPEAT REGION OF PRORP DOMAIN-CONTAINING PROTEIN; 1.
DR   Pfam; PF02390; Methyltransf_4; 1.
DR   SUPFAM; SSF53335; S-adenosyl-L-methionine-dependent methyltransferases; 1.
DR   NCBIfam; NF001080; trmB; 1.
DR   NCBIfam; TIGR00091; tRNA (guanosine(46)-N7)-methyltransferase TrmB; 1.
DR   PROSITE; PS51625; SAM_MT_TRMB; 1.
DR   GO; GO:0043527; C:tRNA methyltransferase complex; IEA:TreeGrafter.
DR   GO; GO:0008176; F:tRNA (guanine(46)-N7)-methyltransferase activity; IEA:UniProtKB-UniRule.
DR   Proteomes; UP000001697; Chromosome.
DR   AlphaFoldDB; B2GDC8; -.
PE   3: Inferred from homology;
KW   Methyltransferase; Reference proteome; S-adenosyl-L-methionine;
KW   Transferase; tRNA processing.
FT   CHAIN           1..215
FT                   /note="tRNA (guanine-N(7)-)-methyltransferase"
FT                   /id="PRO_1000136352"
FT   REGION          124..129
FT                   /note="Interaction with RNA"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01057"
FT   ACT_SITE        118
FT                   /evidence="ECO:0000250"
FT   BINDING         44
FT                   /ligand="S-adenosyl-L-methionine"
FT                   /ligand_id="ChEBI:CHEBI:59789"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01057"
FT   BINDING         69
FT                   /ligand="S-adenosyl-L-methionine"
FT                   /ligand_id="ChEBI:CHEBI:59789"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01057"
FT   BINDING         96
FT                   /ligand="S-adenosyl-L-methionine"
FT                   /ligand_id="ChEBI:CHEBI:59789"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01057"
FT   BINDING         118
FT                   /ligand="S-adenosyl-L-methionine"
FT                   /ligand_id="ChEBI:CHEBI:59789"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01057"
FT   BINDING         122
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01057"
FT   BINDING         154
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01057"
FT   BINDING         192..195
FT                   /ligand="substrate"
FT                   /evidence="ECO:0000255|HAMAP-Rule:MF_01057"
SQ   SEQUENCE   215 AA;  24489 MW;  02A63668A7FED123 CRC64;
     MRVKHKKWAV PLMEAHPEMM TMDPASFKGR WQERFAKPQP LQVEVGMGKG QFIIGMAKAH
     PEINFIGLEI ESTVAAIALK NALPEQLPNL TLVRGDGAGL DTYFEDGSID RLYLNFSDPW
     PKTRHEKRRL TYKTFLANYQ QVVKPGGGLE FKTDNQGLFE YSLTSLNNFG MIFDGVWLNL
     HESPENEGNV ETEYEQRFAS LGQPIYKLKA HFPVN
//