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8  structures 4  species 0  interactions 4  sequences 1  architecture

Family: NrfD_2 (PF14589)

Summary: Polysulfide reductase

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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.

Polysulfide reductase Provide feedback

Bacterial polysulfide reductase is an integral membrane protein complex responsible for quinone-coupled reduction of polysulfide, a process important in extreme environments such as deep-sea vents and hot springs. Polysulfides are a class of compounds composed of chains of sulfur atoms, which in their simplest form are present as an anion with general formula Sn(2-). In nature, polysulfides are found in particularly high concentrations in extreme volcanic or geothermically active environments. Here, the reduction and oxidation of polysulfides are vital processes for many bacteria and are essential steps in the global sulfur cycle. In particular, the reduction of polysulfide to hydrogen sulfide in these environments is usually linked to energy-generating respiratory processes, supporting growth of many microorganisms, particularly hyperthermophiles.

Literature references

  1. Jormakka M, Yokoyama K, Yano T, Tamakoshi M, Akimoto S, Shimamura T, Curmi P, Iwata S;, Nat Struct Mol Biol. 2008;15:730-737.: Molecular mechanism of energy conservation in polysulfide respiration. PUBMED:18536726 EPMC:18536726


Internal database links

External database links

This tab holds annotation information from the InterPro database.

No InterPro data for this Pfam family.

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 DMSO_reductase (CL0308), which has the following description:

This clan includes members that are type II dimethyl sulfoxide reductase families, all of which are also membrane anchor proteins belonging to the iron-sulfur molybdoenzyme (CISM) family [1].

The clan contains the following 3 members:

DmsC NrfD NrfD_2

Alignments

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 using the family HMM. We also generate alignments using four representative proteomes (RP) sets, 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
(3)
Full
(4)
Representative proteomes NCBI
(10)
Meta
(1)
RP15
(0)
RP35
(1)
RP55
(2)
RP75
(2)
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1Cannot generate PP/Heatmap alignments for seeds; no PP data available

Key: ✓ available, x not generated, not available.

Format an alignment

  Seed
(3)
Full
(4)
Representative proteomes NCBI
(10)
Meta
(1)
RP15
(0)
RP35
(1)
RP55
(2)
RP75
(2)
Alignment:
Format:
Order:
Sequence:
Gaps:
Download/view:

Download options

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
(3)
Full
(4)
Representative proteomes NCBI
(10)
Meta
(1)
RP15
(0)
RP35
(1)
RP55
(2)
RP75
(2)
Raw Stockholm Download   Download     Download   Download   Download   Download   Download  
Gzipped Download   Download     Download   Download   Download   Download   Download  

You can also download a FASTA format file containing the full-length sequences for all sequences in the full alignment.

External links

MyHits provides a collection of tools to handle multiple sequence alignments. For example, one can refine a seed alignment (sequence addition or removal, re-alignment or manual edition) and then search databases for remote homologs using HMMER3.

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 View help on the curation process

This family is new in this Pfam release.

Seed source: CATH:2vpzC00, Pfam-B_200168
Previous IDs: none
Type: Domain
Author: Coggill P
Number in seed: 3
Number in full: 4
Average length of the domain: 254.00 aa
Average identity of full alignment: 66 %
Average coverage of the sequence by the domain: 99.22 %

HMM information View help on HMM parameters

HMM build commands:
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 23193494 -E 1000 --cpu 4 HMM pfamseq
Model details:
Parameter Sequence Domain
Gathering cut-off 27.0 27.0
Trusted cut-off 28.9 28.6
Noise cut-off 26.6 26.1
Model length: 251
Family (HMM) version: 1
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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Structures

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 NrfD_2 domain has been found. There are 8 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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