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HAMAP rule MF_00021

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General rule information [?]

Accession MF_00021
Dates 1-JUN-2001 (Created)
1-MAR-2024 (Last updated, Version 44)
Name ThiI
Scope(s) Bacteria
Archaea
Template(s) P77718 (THII_ECOLI); P55913 (THII_SALTY); Q81KU0 (THII_BACAN); [ Recover all ]
Triggered by HAMAP; MF_00021 (Get profile general information and statistics)

Propagated annotation [?]

Identifier, protein and gene names [?]

Identifier THII
case <Feature:PS50206>
Protein name RecName: Full=tRNA sulfurtransferase;
                 EC=2.8.1.4;
AltName: Full=Sulfur carrier protein ThiS sulfurtransferase;
AltName: Full=Thiamine biosynthesis protein ThiI;
AltName: Full=tRNA 4-thiouridine synthase;
end case
case not <Feature:PS50206>
Protein name RecName: Full=Probable tRNA sulfurtransferase;
                 EC=2.8.1.4;
AltName: Full=Sulfur carrier protein ThiS sulfurtransferase;
AltName: Full=Thiamine biosynthesis protein ThiI;
AltName: Full=tRNA 4-thiouridine synthase;
end case
Gene name Name=thiI;

Comments [?]

FUNCTIONCatalyzes the ATP-dependent transfer of a sulfur to tRNA to produce 4-thiouridine in position 8 of tRNAs, which functions as a near-UV photosensor. Also catalyzes the transfer of sulfur to the sulfur carrier protein ThiS, forming ThiS-thiocarboxylate. This is a step in the synthesis of thiazole, in the thiamine biosynthesis pathway. The sulfur is donated as persulfide by IscS.
CATALYTIC ACTIVITY Reaction=[ThiI sulfur-carrier protein]-S-sulfanyl-L-cysteine + a uridine in tRNA + ATP + H(+) + 2 reduced [2Fe-2S]-[ferredoxin] = [ThiI sulfur-carrier protein]-L-cysteine + a 4-thiouridine in tRNA + AMP + diphosphate + 2 oxidized [2Fe-2S]-[ferredoxin]; Xref=Rhea:RHEA:24176, Rhea:RHEA-COMP:10000, Rhea:RHEA-COMP:10001, Rhea:RHEA-COMP:13337, Rhea:RHEA-COMP:13338, Rhea:RHEA-COMP:13339, Rhea:RHEA-COMP:13340, ChEBI:CHEBI:15378, ChEBI:CHEBI:29950, ChEBI:CHEBI:30616, ChEBI:CHEBI:33019, ChEBI:CHEBI:33737, ChEBI:CHEBI:33738, ChEBI:CHEBI:61963, ChEBI:CHEBI:65315, ChEBI:CHEBI:136798, ChEBI:CHEBI:456215; EC=2.8.1.4;
CATALYTIC ACTIVITY Reaction=[sulfur-carrier protein ThiS]-C-terminal Gly-Gly-AMP + AH2 + S-sulfanyl-L-cysteinyl-[cysteine desulfurase] = [sulfur-carrier protein ThiS]-C-terminal Gly-NH-CH2-C(O)SH + A + AMP + H(+) + L- cysteinyl-[cysteine desulfurase]; Xref=Rhea:RHEA:43340, Rhea:RHEA- COMP:12157, Rhea:RHEA-COMP:12158, Rhea:RHEA-COMP:12908, Rhea:RHEA- COMP:12910, ChEBI:CHEBI:13193, ChEBI:CHEBI:15378, ChEBI:CHEBI:17499, ChEBI:CHEBI:29950, ChEBI:CHEBI:61963, ChEBI:CHEBI:90618, ChEBI:CHEBI:90619, ChEBI:CHEBI:456215;
PATHWAYCofactor biosynthesis; thiamine diphosphate biosynthesis.
SUBCELLULAR LOCATIONCytoplasm.
SIMILARITYBelongs to the ThiI family.

Keywords [?]


Gene Ontology [?]

case <Feature:PS51165>
GO:0000049; Molecular function:tRNA binding
end case
GO:0005524; Molecular function:ATP binding
GO:0016783; Molecular function:sulfurtransferase activity
GO:0009229; Biological process:thiamine diphosphate biosynthetic process
GO:0034227; Biological process:tRNA thio-modification
GO:0005737; Cellular component:cytoplasm

Cross-references [?]

PROSITE PS50206; RHODANESE_3; 0-1;
PROSITE PS51165; THUMP; 1;
Pfam PF02568; ThiI; 1;
Pfam PF02926; THUMP; 1;
Pfam PF00581; Rhodanese; 1;
NCBIfam TIGR04271; ThiI_C_thiazole; 0-1;
NCBIfam TIGR00342; TIGR00342; 1;

Features [?]

From: THII_BACAN (Q81KU0)
Key From To Description Tag Condition FTGroup
BINDING 183 184 /ligand="ATP"
/ligand_id="ChEBI:CHEBI:30616"
[LM]-x
BINDING 208 209 /ligand="ATP"
/ligand_id="ChEBI:CHEBI:30616"
[HYNTS]-[FY]
BINDING 265 265 /ligand="ATP"
/ligand_id="ChEBI:CHEBI:30616"
[RK]
BINDING 287 287 /ligand="ATP"
/ligand_id="ChEBI:CHEBI:30616"
G
BINDING 296 296 /ligand="ATP"
/ligand_id="ChEBI:CHEBI:30616"
Q
From: THII_ECOLI (P77718)
Key From To Description Tag Condition FTGroup
case <Feature:PS50206>
ACT_SITE 456 456 /note="Cysteine persulfide intermediate" C
DISULFID 344 456 /note="Redox-active" C-x*-C
end case

Additional information [?]

Size range 368-486 amino acids
Related rules None
Fusion Nter: None Cter: None
Comments Some proteins of this family do not possess a rhodanese domain, so there must be an external rhodanese-like partner involved. It is not known, and the reaction has not been characterized in this case.



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