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Annotation rule MF_01852
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General rule information [?]

Accession MF_01852
Dates 23-SEP-2008 (Created)
16-MAR-2016 (Last updated, Version 11)
Name TsaC
Scope Bacteria; Betaproteobacteria
Bacteria; Gammaproteobacteria
Template P45748 (TSAC_ECOLI)

Propagated annotation [?]

Identifier, protein and gene names [?]

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

Comments [?]

Function Required 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 L-threonine + ATP + HCO(3)(-) = L-threonylcarbamoyladenylate + diphosphate + H(2)O.
Subcellular location Cytoplasm.
Similarity Belongs 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 [?]

PROSITE PS51163; YRDC; 1; trigger=PRU00518;
Pfam PF01300; Sua5_yciO_yrdC; 1;
TIGRFAMs TIGR00057; TIGR00057; 1;

Additional information [?]

Size range 175-214 amino acids
Related rules None
Fusion 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.