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HAMAP rule MF_01852

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General rule information [?]

Accession MF_01852
Dates 23-SEP-2008 (Created)
1-JUN-2023 (Last updated, Version 14)
Name TsaC
Scope(s) Bacteria
Template(s) P45748 (TSAC_ECOLI); [ Recover all ]
Triggered by HAMAP; MF_01852 (Get profile general information and statistics)

Propagated annotation [?]

Identifier, protein and gene names [?]

Identifier TSAC
Protein name RecName: Full=Threonylcarbamoyl-AMP synthase;
                 Short=TC-AMP synthase;
AltName: Full=L-threonylcarbamoyladenylate synthase;
AltName: Full=tRNA threonylcarbamoyladenosine biosynthesis protein TsaC;
AltName: Full=t(6)A37 threonylcarbamoyladenosine biosynthesis protein TsaC;
Gene name Name=tsaC;

Comments [?]

FUNCTIONRequired for the formation of a threonylcarbamoyl group on adenosine at position 37 (t(6)A37) in tRNAs that read codons beginning with adenine. Catalyzes the conversion of L-threonine, HCO(3)(-)/CO(2) and ATP to give threonylcarbamoyl-AMP (TC-AMP) as the acyladenylate intermediate, with the release of diphosphate.
CATALYTIC ACTIVITY Reaction=ATP + hydrogencarbonate + L-threonine = diphosphate + H2O + L- threonylcarbamoyladenylate; Xref=Rhea:RHEA:36407, ChEBI:CHEBI:15377, ChEBI:CHEBI:17544, ChEBI:CHEBI:30616, ChEBI:CHEBI:33019, ChEBI:CHEBI:57926, ChEBI:CHEBI:73682; EC=;
SIMILARITYBelongs to the SUA5 family. TsaC subfamily.

Keywords [?]

Gene Ontology [?]

GO:0005524; Molecular function:ATP binding
GO:0016779; Molecular function:nucleotidyltransferase activity
GO:0002949; Biological process:tRNA threonylcarbamoyladenosine modification
GO:0005737; Cellular component:cytoplasm

Cross-references [?]

Pfam PF01300; Sua5_yciO_yrdC; 1;
NCBIfam TIGR00057; TIGR00057; 1;

Features [?]

Additional information [?]

Size range 175-214 amino acids
Related rules None
Fusion Nter: None Cter: None
Comments The well-known t(6)A modification appears to be a hydrolyzed artifact of natural cyclic t(6)A (ct(6)A) that occurs during the preparation and handling of tRNA in E.coli, B.subtilis and many other species including fungi and plants (PubMed:23242255). In these species, the t(6)A modification is processed further by dehydration into ct(6)A, a reaction catalyzed by TcdA.

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