Summary: TilS substrate binding domain
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TilS substrate binding domain Provide feedback
This domain is found in the tRNA(Ile) lysidine synthetase (TilS) protein.
Kuratani M, Yoshikawa Y, Bessho Y, Higashijima K, Ishii T, Shibata R, Takahashi S, Yutani K, Yokoyama S; , Structure. 2007;15:1642-1653.: Structural basis of the initial binding of tRNA(Ile) lysidine synthetase TilS with ATP and L-lysine. PUBMED:18073113 EPMC:18073113
Nakanishi K, Fukai S, Ikeuchi Y, Soma A, Sekine Y, Suzuki T, Nureki O; , Proc Natl Acad Sci U S A. 2005;102:7487-7492.: Structural basis for lysidine formation by ATP pyrophosphatase accompanied by a lysine-specific loop and a tRNA-recognition domain. PUBMED:15894617 EPMC:15894617
External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR015262
The aminoacyl-tRNA synthetase (also known as aminoacyl-tRNA ligase) catalyse the attachment of an amino acid to its cognate transfer RNA molecule in a highly specific two-step reaction. These proteins differ widely in size and oligomeric state, and have limited sequence homology [PUBMED:2203971]. The 20 aminoacyl-tRNA synthetases are divided into two classes, I and II. Class I aminoacyl-tRNA synthetases contain a characteristic Rossman fold catalytic domain and are mostly monomeric [PUBMED:10673435]. Class II aminoacyl-tRNA synthetases share an anti-parallel beta-sheet fold flanked by alpha-helices [PUBMED:8364025], and are mostly dimeric or multimeric, containing at least three conserved regions [PUBMED:8274143, PUBMED:2053131, PUBMED:1852601]. However, tRNA binding involves an alpha-helical structure that is conserved between class I and class II synthetases. In reactions catalysed by the class I aminoacyl-tRNA synthetases, the aminoacyl group is coupled to the 2'-hydroxyl of the tRNA, while, in class II reactions, the 3'-hydroxyl site is preferred. The synthetases specific for arginine, cysteine, glutamic acid, glutamine, isoleucine, leucine, methionine, tyrosine, tryptophan and valine belong to class I synthetases. The synthetases specific for alanine, asparagine, aspartic acid, glycine, histidine, lysine, phenylalanine, proline, serine, and threonine belong to class-II synthetases [PUBMED:]. Based on their mode of binding to the tRNA acceptor stem, both classes of tRNA synthetases have been subdivided into three subclasses, designated 1a, 1b, 1c and 2a, 2b, 2c.
This entry represents the substrate-binding domain of lysidine-tRNA(Ile) synthetase, which ligates lysine onto the cytidine present at position 34 of the AUA codon-specific tRNA(Ile) that contains the anticodon CAU, in an ATP-dependent manner. Cytidine is converted to lysidine, thus changing the amino acid specificity of the tRNA from methionine to isoleucine. The N-terminal region contains the highly conserved SGGXDS motif, predicted to be a PP-loop motif involved in ATP binding.
The only examples in which the wobble position of a tRNA must discriminate between G and A of mRNA are AUA (Ile) versus AUG (Met) and UGA (stop) versus UGG (Trp). In all bacteria, the wobble position of the tRNA(Ile) recognizing AUA is lysidine, a lysine derivative of cytidine. This domain is found, apparently, in all bacteria in a single copy. Eukaryotic sequences appear to be organellar. The domain architecture of this protein is variable; some, including characterised proteins of Escherichia coli and Bacillus subtilis known to be tRNA(Ile)-lysidine synthetase, include a conserved 50-residue domain that many other members lack. This protein belongs to the ATP-binding PP-loop family. It appears in the literature and protein databases as TilS, YacA, and putative cell cycle protein MesJ (a misnomer).
The PP-loop motif appears to be a modified version of the P-loop of nucleotide binding domain that is involved in phosphate binding [PUBMED:7731953]. Named PP-motif, since it appears to be a part of a previously uncharacterised ATP pyrophophatase domain. ATP sulfurylases, E. coli NtrL, and B. subtilis OutB consist of this domain alone. In other proteins, the pyrophosphatase domain is associated with amidotransferase domains (type I or type II), a putative citrulline-aspartate ligase domain or a nitrilase/amidase domain. The HUP domain class (after HIGH-signature proteins, UspA, and PP-ATPase) groups together PP-loop ATPases, the nucleotide-binding domains of class I aminoacyl-tRNA synthetases, UspA protein (USPA domains), photolyases, and electron transport flavoproteins (ETFP). The HUP domain is a distinct class of alpha/beta domain[PUBMED:12012333].
More information about this protein can be found at Protein of the Month: ATP Synthases [PUBMED:].
The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.
|Cellular component||cytoplasm (GO:0005737)|
|Molecular function||ligase activity, forming carbon-nitrogen bonds (GO:0016879)|
|ATP binding (GO:0005524)|
|nucleotide binding (GO:0000166)|
|Biological process||tRNA processing (GO:0008033)|
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Curation and family details
|Author:||Sammut SJ, Bateman A|
|Number in seed:||289|
|Number in full:||8418|
|Average length of the domain:||68.40 aa|
|Average identity of full alignment:||33 %|
|Average coverage of the sequence by the domain:||17.00 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 80369284 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||7|
|Download:||download the raw HMM for this family|
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For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the TilS domain has been found. There are 3 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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