Terminase large subunit, endonuclease domain; This is the endonuclease domain of Terminase ...
262-538
2.43e-32
Terminase large subunit, endonuclease domain; This is the endonuclease domain of Terminase large subunit TerL, a key component of the DNA packing machinery in tailed bacteriophages and related viruses. TerL comprises a N-terminal ATPase domain (pfam03354) which powers the DNA translocation and this C-terminal endonuclease domain that cuts concatemeric DNA first in the initiation phase in a sequence specific site and later in the completion stage of the DNA packaging process when the capsid is full. Cryo-EM studies indicate that TerL forms a pentamer that binds to a dodecameric assembly called portal and attaches to the capsid. It has been proposed that nuclease domains form a radially arranged ring that is proximal to portal, playing a key role in pentamer assembly. This nuclease domain has a RNAse H-like fold and it has been proposed to utilize a two-metal catalysis mechanism like in other RNAse H-like endonucleases such as RNase H, transposases, retroviral integrases and RuvC Holliday junction resolvases.
Pssm-ID: 466590 Cd Length: 284 Bit Score: 125.85 E-value: 2.43e-32
Terminase large subunit, endonuclease domain; This is the endonuclease domain of Terminase ...
262-538
2.43e-32
Terminase large subunit, endonuclease domain; This is the endonuclease domain of Terminase large subunit TerL, a key component of the DNA packing machinery in tailed bacteriophages and related viruses. TerL comprises a N-terminal ATPase domain (pfam03354) which powers the DNA translocation and this C-terminal endonuclease domain that cuts concatemeric DNA first in the initiation phase in a sequence specific site and later in the completion stage of the DNA packaging process when the capsid is full. Cryo-EM studies indicate that TerL forms a pentamer that binds to a dodecameric assembly called portal and attaches to the capsid. It has been proposed that nuclease domains form a radially arranged ring that is proximal to portal, playing a key role in pentamer assembly. This nuclease domain has a RNAse H-like fold and it has been proposed to utilize a two-metal catalysis mechanism like in other RNAse H-like endonucleases such as RNase H, transposases, retroviral integrases and RuvC Holliday junction resolvases.
Pssm-ID: 466590 Cd Length: 284 Bit Score: 125.85 E-value: 2.43e-32
Terminase large subunit, ATPase domain; Terminase large subunit (TerL) from bacteriophages and ...
82-252
5.46e-28
Terminase large subunit, ATPase domain; Terminase large subunit (TerL) from bacteriophages and evolutionarily related viruses, is an important component of the DNA packing machinery and comprises an ATPase domain, which powers DNA translocation and a nuclease domain that cuts concatemeric DNA. TerL forms pentamers in which the ATPase domains form a ring distal to the capsid. This is the ATPase domain which contains a C-terminal subdomain that sits above the ATPase active site, called the "Lid subdomain" with reference to analogous lid subdomains found in other ATPases. It contains a hydrophobic patch (Trp and Tyr residues) that mediates critical interactions in the interface between adjacent ATPase subunits and assists the positioning of the arginine finger residue that catalyzes ATP hydrolysis. This entry also includes bacterial proteins of unknown function.
Pssm-ID: 460895 [Multi-domain] Cd Length: 178 Bit Score: 110.48 E-value: 5.46e-28
Database: CDSEARCH/cdd Low complexity filter: no Composition Based Adjustment: yes E-value threshold: 0.01
References:
Wang J et al. (2023), "The conserved domain database in 2023", Nucleic Acids Res.51(D)384-8.
Lu S et al. (2020), "The conserved domain database in 2020", Nucleic Acids Res.48(D)265-8.
Marchler-Bauer A et al. (2017), "CDD/SPARCLE: functional classification of proteins via subfamily domain architectures.", Nucleic Acids Res.45(D)200-3.
of the residues that compose this conserved feature have been mapped to the query sequence.
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Functional characterization of the conserved domain architecture found on the query.
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This image shows a graphical summary of conserved domains identified on the query sequence.
The Show Concise/Full Display button at the top of the page can be used to select the desired level of detail: only top scoring hits
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if a domain or superfamily has been annotated with functional sites (conserved features),
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click on the bars or triangles to view your query sequence embedded in a multiple sequence alignment of the proteins used to develop the corresponding domain model.
The table lists conserved domains identified on the query sequence. Click on the plus sign (+) on the left to display full descriptions, alignments, and scores.
Click on the domain model's accession number to view the multiple sequence alignment of the proteins used to develop the corresponding domain model.
To view your query sequence embedded in that multiple sequence alignment, click on the colored bars in the Graphical Summary portion of the search results page,
or click on the triangles, if present, that represent functional sites (conserved features)
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Concise Display shows only the best scoring domain model, in each hit category listed below except non-specific hits, for each region on the query sequence.
(labeled illustration) Standard Display shows only the best scoring domain model from each source, in each hit category listed below for each region on the query sequence.
(labeled illustration) Full Display shows all domain models, in each hit category below, that meet or exceed the RPS-BLAST threshold for statistical significance.
(labeled illustration) Four types of hits can be shown, as available,
for each region on the query sequence:
specific hits meet or exceed a domain-specific e-value threshold
(illustrated example)
and represent a very high confidence that the query sequence belongs to the same protein family as the sequences use to create the domain model
non-specific hits
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the domain superfamily to which the specific and non-specific hits belong
multi-domain models that were computationally detected and are likely to contain multiple single domains
Retrieve proteins that contain one or more of the domains present in the query sequence, using the Conserved Domain Architecture Retrieval Tool
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