MTAB_MALIO
ID MTAB_MALIO Reviewed; 438 AA.
AC Q49573; Q49574;
DT 01-NOV-1997, integrated into UniProtKB/Swiss-Prot.
DT 01-NOV-1997, sequence version 1.
DT 03-AUG-2022, entry version 86.
DE RecName: Full=Threonylcarbamoyladenosine tRNA methylthiotransferase MtaB;
DE EC=2.8.4.5;
DE AltName: Full=tRNA-t(6)A37 methylthiotransferase;
GN Name=mtaB;
OS Malacoplasma iowae (Mycoplasma iowae).
OC Bacteria; Tenericutes; Mycoplasmoidales; Mycoplasmoidaceae; Malacoplasma.
OX NCBI_TaxID=2116;
RN [1]
RP NUCLEOTIDE SEQUENCE [GENOMIC DNA].
RC STRAIN=PPAV;
RX PubMed=8684373; DOI=10.1006/mcpr.1996.0004;
RA Laigret F., Deaville J., Bove J., Bradbury J.M.;
RT "Specific detection of Mycoplasma iowae using polymerase chain reaction.";
RL Mol. Cell. Probes 10:23-29(1996).
CC -!- FUNCTION: Catalyzes the methylthiolation of N6-
CC threonylcarbamoyladenosine (t(6)A), leading to the formation of 2-
CC methylthio-N6-threonylcarbamoyladenosine (ms(2)t(6)A) at position 37 in
CC tRNAs that read codons beginning with adenine.
CC {ECO:0000250|UniProtKB:P54462}.
CC -!- CATALYTIC ACTIVITY:
CC Reaction=[sulfur carrier]-SH + AH2 + N(6)-L-
CC threonylcarbamoyladenosine(37) in tRNA + 2 S-adenosyl-L-methionine =
CC 2-methylsulfanyl-N(6)-L-threonylcarbamoyladenosine(37) in tRNA + 5'-
CC deoxyadenosine + [sulfur carrier]-H + A + 2 H(+) + L-methionine + S-
CC adenosyl-L-homocysteine; Xref=Rhea:RHEA:37075, Rhea:RHEA-COMP:10163,
CC Rhea:RHEA-COMP:11092, Rhea:RHEA-COMP:14737, Rhea:RHEA-COMP:14739,
CC ChEBI:CHEBI:13193, ChEBI:CHEBI:15378, ChEBI:CHEBI:17319,
CC ChEBI:CHEBI:17499, ChEBI:CHEBI:29917, ChEBI:CHEBI:57844,
CC ChEBI:CHEBI:57856, ChEBI:CHEBI:59789, ChEBI:CHEBI:64428,
CC ChEBI:CHEBI:74418, ChEBI:CHEBI:74420; EC=2.8.4.5;
CC Evidence={ECO:0000250|UniProtKB:P54462};
CC -!- COFACTOR:
CC Name=[4Fe-4S] cluster; Xref=ChEBI:CHEBI:49883;
CC Evidence={ECO:0000255|PROSITE-ProRule:PRU00780};
CC Note=Binds 2 [4Fe-4S] clusters. One cluster is coordinated with 3
CC cysteines and an exchangeable S-adenosyl-L-methionine.
CC {ECO:0000255|PROSITE-ProRule:PRU00780};
CC -!- SUBCELLULAR LOCATION: Cytoplasm {ECO:0000255|PROSITE-ProRule:PRU00780}.
CC -!- SIMILARITY: Belongs to the methylthiotransferase family. MtaB
CC subfamily. {ECO:0000305}.
CC -!- SEQUENCE CAUTION:
CC Sequence=AAC44030.1; Type=Frameshift; Note=Produces two separate ORFs.; Evidence={ECO:0000305};
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DR EMBL; U29676; AAC44029.1; ALT_FRAME; Genomic_DNA.
DR EMBL; U29676; AAC44030.1; ALT_FRAME; Genomic_DNA.
DR PIR; T10440; T10440.
DR PIR; T10441; T10441.
DR GO; GO:0005737; C:cytoplasm; IEA:UniProtKB-SubCell.
DR GO; GO:0051539; F:4 iron, 4 sulfur cluster binding; IEA:UniProtKB-KW.
DR GO; GO:0046872; F:metal ion binding; IEA:UniProtKB-KW.
DR GO; GO:0061712; F:tRNA (N(6)-L-threonylcarbamoyladenosine(37)-C(2))-methylthiotransferase; IEA:UniProtKB-EC.
DR GO; GO:0006400; P:tRNA modification; IEA:InterPro.
DR Gene3D; 3.40.50.12160; -; 1.
DR Gene3D; 3.80.30.20; -; 1.
DR InterPro; IPR006638; Elp3/MiaB/NifB.
DR InterPro; IPR005839; Methylthiotransferase.
DR InterPro; IPR020612; Methylthiotransferase_CS.
DR InterPro; IPR013848; Methylthiotransferase_N.
DR InterPro; IPR038135; Methylthiotransferase_N_sf.
DR InterPro; IPR006467; MiaB-like_C.
DR InterPro; IPR007197; rSAM.
DR InterPro; IPR023404; rSAM_horseshoe.
DR InterPro; IPR002792; TRAM_dom.
DR Pfam; PF04055; Radical_SAM; 1.
DR Pfam; PF00919; UPF0004; 1.
DR SFLD; SFLDG01061; methylthiotransferase; 1.
DR SFLD; SFLDS00029; Radical_SAM; 1.
DR SMART; SM00729; Elp3; 1.
DR TIGRFAMs; TIGR01579; MiaB-like-C; 1.
DR TIGRFAMs; TIGR00089; TIGR00089; 1.
DR PROSITE; PS51449; MTTASE_N; 1.
DR PROSITE; PS01278; MTTASE_RADICAL; 1.
DR PROSITE; PS51918; RADICAL_SAM; 1.
DR PROSITE; PS50926; TRAM; 1.
PE 3: Inferred from homology;
KW 4Fe-4S; Cytoplasm; Iron; Iron-sulfur; Metal-binding;
KW S-adenosyl-L-methionine; Transferase; tRNA processing.
FT CHAIN 1..438
FT /note="Threonylcarbamoyladenosine tRNA
FT methylthiotransferase MtaB"
FT /id="PRO_0000141757"
FT DOMAIN 8..119
FT /note="MTTase N-terminal"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00780"
FT DOMAIN 145..382
FT /note="Radical SAM core"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU01266"
FT DOMAIN 376..438
FT /note="TRAM"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00208"
FT BINDING 17
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_label="1"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00780"
FT BINDING 53
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_label="1"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00780"
FT BINDING 84
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_label="1"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00780"
FT BINDING 159
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_label="2"
FT /ligand_note="4Fe-4S-S-AdoMet"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00780"
FT BINDING 163
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_label="2"
FT /ligand_note="4Fe-4S-S-AdoMet"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00780"
FT BINDING 166
FT /ligand="[4Fe-4S] cluster"
FT /ligand_id="ChEBI:CHEBI:49883"
FT /ligand_label="2"
FT /ligand_note="4Fe-4S-S-AdoMet"
FT /evidence="ECO:0000255|PROSITE-ProRule:PRU00780"
SQ SEQUENCE 438 AA; 51290 MW; B130B50566D13320 CRC64;
MNNDTKINTF AIHTLGCKVN LFESNSIKND LIMNGLVEVP FDSKADVYII NTCTVTNKAD
AKSRLYIKRA HVQNKDAIII VAGCMSQVNK DLMDKLKISI QIGNKYKNSV FDLINEYLKK
RERIYRVENI LAEKKFEQTT QDFIFLENTR AFIKIQDGCN FMCSYCIIPF SRGRQRSQKM
ESILEKIKTL VSKXFKEIVL TGVNTAGYLD ENNNTFFDLL NNINKLDGDF RVRISSLEPF
QINDEIIDLV TSNKKRFCQH WHICLQSGSD DVLKKMNRKY TTDEFYKLMQ KILNKSPLTN
FTTDYIVGFP TETDEDQKKS IDFLNKIKLY DMHIFPYSKR NNTRSSHYKD INDSTKKDRV
KEITKLNYLN KKENLKKYIG KTCEVLFEKK KEDEKMWSGY SNEYCRVMVE SGDNLENKML
KVRIKKIFFD SLVGEIID
