Summary: Type II restriction enzyme SfiI
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Type II restriction enzyme SfiI Provide feedback
SfiI is a restriction enzyme that can cleave two DNA sites simultaneously to leave 3-base 3' overhangs. It acts as a homo-tetramer and recognises a specific eight base-paid palindromic DNA sequence. After binding two copies of its recognition sequence, SfiI becomes activated leading to cleavage of all four DNA strands. The structure of SfiI consists of a central twisted beta-sheet surrounded by alpha-helices.
Literature references
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Steczkiewicz K, Muszewska A, Knizewski L, Rychlewski L, Ginalski K;, Nucleic Acids Res. 2012;40:7016-7045.: Sequence, structure and functional diversity of PD-(D/E)XK phosphodiesterase superfamily. PUBMED:22638584 EPMC:22638584
This tab holds annotation information from the InterPro database.
InterPro entry IPR021580
SfiI is a restriction enzyme that can cleave two DNA sites simultaneously to leave 3-base 3' overhangs. It acts as a homo-tetramer and recognises a specific eight base-paid palindromic DNA sequence. After binding two copies of its recognition sequence, SfiI becomes activated leading to cleavage of all four DNA strands. The structure of SfiI consists of a central twisted beta-sheet surrounded by alpha-helices.
Domain organisation
Below is a listing of the unique domain organisations or architectures in which this domain is found. More...
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Pfam Clan
This family is a member of clan PDDEXK (CL0236), which has the following description:
This clan includes a large number of nuclease families related to holliday junction resolvases [1,2].
The clan contains the following 127 members:
ArenaCapSnatch BamHI BpuJI_N BpuSI_N Bse634I BsuBI_PstI_RE Cas_APE2256 Cas_Cas02710 Cas_Cas4 Cas_Csm6 Cas_DxTHG Cas_NE0113 CoiA Csa1 Dna2 DpnI DpnII DUF1016 DUF1780 DUF1887 DUF2034 DUF2161 DUF234 DUF2357 DUF2726 DUF2800 DUF2887 DUF3799 DUF3883 DUF4143 DUF4263 DUF4420 DUF559 EcoRI EcoRII-C eIF-3_zeta Endonuc-BglII Endonuc-BsobI Endonuc-EcoRV Endonuc-FokI_C Endonuc-HincII Endonuc-MspI Endonuc-PvuII Endonuc_BglI Endonuc_Holl ERCC4 Exo5 Flu_PA Herpes_alk_exo Herpes_UL24 Hjc HSDR_N HSDR_N_2 L_protein_N McrBC MepB MmcB-like Mrr_cat Mrr_cat_2 MutH MvaI_BcnI NaeI NERD NgoMIV_restric NotI NucS PDCD9 PDDEXK_1 PDDEXK_10 PDDEXK_2 PDDEXK_3 PDDEXK_4 PDDEXK_5 PDDEXK_7 PDDEXK_9 Pet127 Phage_endo_I R-HINP1I Rad10 RAI1 RAP RE_AlwI RE_ApaLI RE_Bpu10I RE_Bsp6I RE_CfrBI RE_Eco47II RE_EcoO109I RE_HaeII RE_HindIII RE_HindVP RE_HpaII RE_LlaJI RE_LlaMI RE_MjaI RE_NgoBV RE_NgoPII RE_SacI RE_ScaI RE_SinI RE_TaqI RE_TdeIII RE_XamI RE_XcyI RecU RestrictionMunI RestrictionSfiI RmuC RNA_pol_Rpb5_N Sen15 SfsA Spo0A_C TBPIP_N ThaI Tn7_Tnp_TnsA_N Transposase_31 tRNA_int_endo Tsp45I Uma2 UPF0102 VirArc_Nuclease VRR_NUC Vsr XhoI XisH YaeQ YqaJAlignments
We store a range of different sequence alignments for families. As well as the seed alignment from which the family is built, we provide the full alignment, generated by searching the sequence database (reference proteomes) using the family HMM. We also generate alignments using four representative proteomes (RP) sets, the UniProtKB sequence database, the NCBI sequence database, and our metagenomics sequence database. More...
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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.
Seed (1) |
Full (5) |
Representative proteomes | UniProt (7) |
NCBI (17) |
Meta (0) |
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RP15 (4) |
RP35 (5) |
RP55 (5) |
RP75 (5) |
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PP/heatmap | 1 |
1Cannot generate PP/Heatmap alignments for seeds; no PP data available
Key:
available,
not generated,
— not available.
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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.
Seed (1) |
Full (5) |
Representative proteomes | UniProt (7) |
NCBI (17) |
Meta (0) |
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RP15 (4) |
RP35 (5) |
RP55 (5) |
RP75 (5) |
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Raw Stockholm | |||||||||
Gzipped |
You can also download a FASTA format file containing the full-length sequences for all sequences in the full alignment.
HMM logo
HMM logos is one way of visualising profile HMMs. Logos provide a quick overview of the properties of an HMM in a graphical form. You can see a more detailed description of HMM logos and find out how you can interpret them here. More...
Trees
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.
Note: You can also download the data file for the tree.
Curation and family details
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.
Curation
Seed source: | pdb_2ezv |
Previous IDs: | none |
Type: | Family |
Author: | Pollington J |
Number in seed: | 1 |
Number in full: | 5 |
Average length of the domain: | 228.80 aa |
Average identity of full alignment: | 56 % |
Average coverage of the sequence by the domain: | 94.31 % |
HMM information
HMM build commands: |
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 26740544 -E 1000 --cpu 4 HMM pfamseq
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Model details: |
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Model length: | 234 | ||||||||||||
Family (HMM) version: | 7 | ||||||||||||
Download: | download the raw HMM for this family |
Species distribution
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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 adjacent tab. More...
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Interactions
There is 1 interaction for this family. More...
RestrictionSfiIStructures
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 RestrictionSfiI domain has been found. There are 4 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.
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