Summary: Mitochondrial resolvase Ydc2 / RNA splicing MRS1
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Ydc2 protein domain Edit Wikipedia article
|Ydc2 protein domain|
Crystal structure of the yeast mitochondrial Holliday junction resolvase, YDC2
|SCOPe||1kcf / SUPFAM|
In molecular biology, the protein domain, Ydc2 (also known as SpCce1), is a Holliday junction resolvase from the fission yeast Schizosaccharomyces pombe that is involved in the maintenance of mitochondrial DNA.
In molecular biology, the Ydc2 domains are enzymes, or in other words biological catalysts, capable of resolving Holliday junctions into separate DNA duplexes by cleaving DNA after 5'-CT-3, and 5'-TT-3, sequences.
The junction resolving enzymes are very diverse, but have the following properties in common:
- high structure specificity for binding
- metal dependent, sequence specific cleavage activity
Essentially, they are highly specific.
Furthermore, the cleavage efficiency is affected by:
- strand type (continuous or exchange)
- nucleotide sequence at cleavage site
This protein domain forms a ribonuclease H fold consisting of two beta sheets and one alpha helix, arranged as a beta-alpha-beta motif. Each beta sheet has five strands, arranged in a 32145 order, with the second strand being antiparallel to the rest.
- White MF, Lilley DM (1998). "Interaction of the resolving enzyme YDC2 with the four-way DNA junction". Nucleic Acids Res. 26 (24): 5609â€“16. doi:10.1093/nar/26.24.5609. PMC 148026. PMID 9837990.
- Ceschini S, Keeley A, McAlister MS, Oram M, Phelan J, Pearl LH, Tsaneva IR, Barrett TE (December 2001). "Crystal structure of the fission yeast mitochondrial Holliday junction resolvase Ydc2". EMBO J. 20 (23): 6601â€“11. doi:10.1093/emboj/20.23.6601. PMC 125760. PMID 11726496.
This tab holds the annotation information that is stored in the Pfam database. As we move to using Wikipedia as our main source of annotation, the contents of this tab will be gradually replaced by the Wikipedia tab.
Mitochondrial resolvase Ydc2 / RNA splicing MRS1 Provide feedback
Members of this family adopt a secondary structure consisting of two beta sheets and one alpha helix, arranged as a beta-alpha-beta motif. Each beta sheet has five strands, arranged in a 32145 order, with the second strand being antiparallel to the rest. Mitochondrial resolvase Ydc2 is capable of resolving Holliday junctions and cleaves DNA after 5'-CT-3' and 5'-TT-3' sequences . This family also contains the mitochondrial RNA-splicing protein MRS1 which is involved in the excision of group I introns [2-3].
Ceschini S, Keeley A, McAlister MS, Oram M, Phelan J, Pearl LH, Tsaneva IR, Barrett TE; , EMBO J. 2001;20:6601-6611.: Crystal structure of the fission yeast mitochondrial Holliday junction resolvase Ydc2. PUBMED:11726496 EPMC:11726496
Turk EM, Caprara MG;, J Biol Chem. 2010;285:8585-8594.: Splicing of yeast aI5beta group I intron requires SUV3 to recycle MRS1 via mitochondrial degradosome-promoted decay of excised intron ribonucleoprotein (RNP). PUBMED:20064926 EPMC:20064926
Kreike J, Schulze M, Pillar T, Korte A, Rodel G;, Curr Genet. 1986;11:185-191.: Cloning of a nuclear gene MRS1 involved in the excision of a single group I intron (bI3) from the mitochondrial COB transcript in S. cerevisiae. PUBMED:2834089 EPMC:2834089
Internal database links
|Similarity to PfamA using HHSearch:||Pox_A22|
External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR015242
This domain forms a ribonuclease H fold consisting of two beta sheets and one alpha helix, arranged as a beta-alpha-beta motif. Each beta sheet has five strands, arranged in a 32145 order, with the second strand being antiparallel to the rest. They are capable of resolving Holliday junctions and cleave DNA after 5'-CT-3, and 5'-TT-3, sequences [ PUBMED:11726496 ]. This entry also includes a domain found in the mitochondrial RNA-splicing protein MRS1 which is involved in the excision of group I introns [ PUBMED:20064926 , PUBMED:2834089 ].
Below is a listing of the unique domain organisations or architectures in which this domain is found. More...
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This clan includes a diverse set of nucleases that share a similar structure to Ribonuclease H.
The clan contains the following 70 members:Arena_ncap_C CAF1 DDE_1 DDE_2 DDE_3 DDE_5 DDE_Tnp_1 DDE_Tnp_1_2 DDE_Tnp_1_3 DDE_Tnp_1_4 DDE_Tnp_1_5 DDE_Tnp_1_6 DDE_Tnp_1_7 DDE_Tnp_2 DDE_Tnp_4 DDE_Tnp_IS1 DDE_Tnp_IS1595 DDE_Tnp_IS240 DDE_Tnp_IS66 DDE_Tnp_ISAZ013 DDE_Tnp_ISL3 DDE_Tnp_Tn3 Dimer_Tnp_Tn5 DNA_pol_A_exo1 DNA_pol_B_exo1 DNA_pol_B_exo2 DNA_pol_P_Exo DUF1258 DUF2779 DUF3882 DUF3892 DUF4152 DUF99 Endonuclease_5 KDZ Maelstrom Methyltransf_1N MGMT_N MULE NurA OrfB_IS605 Piwi Plant_tran Plavaka Pox_A22 Ribosomal_S30AE RNase_H RNase_H_2 RNase_HII RNase_T RNaseH_like RT_RNaseH RT_RNaseH_2 RuvC RuvC_1 Rv2179c-like rve rve_2 rve_3 RVT_3 Taq-exonuc TerL_nuclease Terminase_3C Terminase_6C Transposase_1 Transposase_21 Transposase_mut UPF0236 UvrC_RNaseH_dom Ydc2-catalyt
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You can see the alignments as HTML or in three different sequence viewers:
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We make a range of alignments for each Pfam-A family. You can see a description of each above. You can view these alignments in various ways but please note that some types of alignment are never generated while others may not be available for all families, most commonly because the alignments are too large to handle.
1Cannot generate PP/Heatmap alignments for seeds; no PP data available
Key: available, not generated, — not available.
Format an alignment
We make all of our alignments available in Stockholm format. You can download them here as raw, plain text files or as gzip-compressed files.
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This page displays the phylogenetic tree for this family's seed alignment. We use FastTree to calculate neighbour join trees with a local bootstrap based on 100 resamples (shown next to the tree nodes). FastTree calculates approximately-maximum-likelihood phylogenetic trees from our seed alignment.
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This section shows the detailed information about the Pfam family. You can see the definitions of many of the terms in this section in the glossary and a fuller explanation of the scoring system that we use in the scores section of the help pages.
|Number in seed:||47|
|Number in full:||481|
|Average length of the domain:||263.70 aa|
|Average identity of full alignment:||26 %|
|Average coverage of the sequence by the domain:||69.15 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 61295632 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||13|
|Download:||download the raw HMM for this family|
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This visualisation provides a simple graphical representation of the distribution of this family across species. You can find the original interactive tree in the More....
This chart is a modified "sunburst" visualisation of the species tree for this family. It shows each node in the tree as a separate arc, arranged radially with the superkingdoms at the centre and the species arrayed around the outermost ring.
How the sunburst is generated
The tree is built by considering the taxonomic lineage of each sequence that has a match to this family. For each node in the resulting tree, we draw an arc in the sunburst. The radius of the arc, its distance from the root node at the centre of the sunburst, shows the taxonomic level ("superkingdom", "kingdom", etc). The length of the arc represents either the number of sequences represented at a given level, or the number of species that are found beneath the node in the tree. The weighting scheme can be changed using the sunburst controls.
In order to reduce the complexity of the representation, we reduce the number of taxonomic levels that we show. We consider only the following eight major taxonomic levels:
Colouring and labels
Segments of the tree are coloured approximately according to their superkingdom. For example, archeal branches are coloured with shades of orange, eukaryotes in shades of purple, etc. The colour assignments are shown under the sunburst controls. Where space allows, the name of the taxonomic level will be written on the arc itself.
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There are some situations that the sunburst tree cannot easily handle and for which we have work-arounds in place.
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Some species in the taxonomic tree may not have one or more of the main eight levels that we display. For example, Bos taurus is not assigned an order in the NCBI taxonomic tree. In such cases we mark the omitted level with, for example, "No order", in both the tooltip and the lineage summary.
Unmapped species names
The tree is built by looking at each sequence in the full alignment for the family. We take the name of the species given by UniProt and try to map that to the full taxonomic tree from NCBI. In some cases, the name chosen by UniProt does not map to any node in the NCBI tree, perhaps because the chosen name is listed as a synonym or a misspelling in the NCBI taxonomy.
So that these nodes are not simply omitted from the sunburst tree, we group them together in a separate branch (or segment of the sunburst tree). Since we cannot determine the lineage for these unmapped species, we show all levels between the superkingdom and the species as "uncategorised".
Since we reduce the species tree to only the eight main taxonomic levels, sequences that are mapped to the sub-species level in the tree would not normally be shown. Rather than leave out these species, we map them instead to their parent species. So, for example, for sequences belonging to one of the Vibrio cholerae sub-species in the NCBI taxonomy, we show them instead as belonging to the species Vibrio cholerae.
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For large species trees, you may see blank regions in the outer layers of the sunburst. These occur when there are large numbers of arcs to be drawn in a small space. If an arc is less than approximately one pixel wide, it will not be drawn and the space will be left blank. You may still be able to get some information about the species in that region by moving your mouse across the area, but since each arc will be very small, it will be difficult to accurately locate a particular species.
The tree shows the occurrence of this domain across different species. More...
We show the species tree in one of two ways. For smaller trees we try to show an interactive representation, which allows you to select specific nodes in the tree and view them as an alignment or as a set of Pfam domain graphics.
Unfortunately we have found that there are problems viewing the interactive tree when the it becomes larger than a certain limit. Furthermore, we have found that Internet Explorer can become unresponsive when viewing some trees, regardless of their size. We therefore show a text representation of the species tree when the size is above a certain limit or if you are using Internet Explorer to view the site.
If you are using IE you can still load the interactive tree by clicking the "Generate interactive tree" button, but please be aware of the potential problems that the interactive species tree can cause.
For all of the domain matches in a full alignment, we count the number that are found on all sequences in the alignment. This total is shown in the purple box.
We also count the number of unique sequences on which each domain is found, which is shown in green. Note that a domain may appear multiple times on the same sequence, leading to the difference between these two numbers.
Finally, we group sequences from the same organism according to the NCBI code that is assigned by UniProt, allowing us to count the number of distinct sequences on which the domain is found. This value is shown in the pink boxes.
We use the NCBI species tree to group organisms according to their taxonomy and this forms the structure of the displayed tree. Note that in some cases the trees are too large (have too many nodes) to allow us to build an interactive tree, but in most cases you can still view the tree in a plain text, non-interactive representation. Those species which are represented in the seed alignment for this domain are highlighted.
You can use the tree controls to manipulate how the interactive tree is displayed:
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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 Ydc2-catalyt domain has been found. There are 2 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 sequence.
Loading structure mapping...
AlphaFold Structure Predictions
The list of proteins below match this family and have AlphaFold predicted structures. Click on the protein accession to view the predicted structure.
|Protein||Predicted structure||External Information|
|P07266||View 3D Structure||Click here|
|Q03702||View 3D Structure||Click here|
|Q10423||View 3D Structure||Click here|
|Q5A864||View 3D Structure||Click here|