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137  structures 9364  species 10  interactions 13383  sequences 145  architectures

Family: RNA_pol_Rpb1_2 (PF00623)

Summary: RNA polymerase Rpb1, domain 2

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The Pfam group coordinates the annotation of Pfam families in Wikipedia, but we have not yet assigned a Wikipedia article to this family. If you think that a particular Wikipedia article provides good annotation, please let us know.

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.

RNA polymerase Rpb1, domain 2 Provide feedback

RNA polymerases catalyse the DNA dependent polymerisation of RNA. Prokaryotes contain a single RNA polymerase compared to three in eukaryotes (not including mitochondrial. and chloroplast polymerases). This domain, domain 2, contains the active site. The invariant motif -NADFDGD- binds the active site magnesium ion [1,2].

Literature references

  1. Severinov K, Mustaev A, Kukarin A, Muzzin O, Bass I, Darst SA, Goldfarb A; , J Biol Chem 1996;271:27969-27974.: Structural modules of the large subunits of RNA polymerase. Introducing archaebacterial and chloroplast split sites in the beta and beta' subunits of Escherichia coli RNA polymerase. PUBMED:8910400 EPMC:8910400

  2. Cramer P, Bushnell DA, Kornberg RD; , Science 2001;292:1863-1876.: Structural basis of transcription: RNA polymerase II at 2.8 angstrom resolution. PUBMED:11313498 EPMC:11313498


External database links

This tab holds annotation information from the InterPro database.

InterPro entry IPR000722

RNA polymerases catalyse the DNA dependent polymerisation of RNA from DNA, using the four ribonucleoside triphosphates as substrates. Prokaryotes contain a single RNA polymerase compared to three in eukaryotes (not including mitochondrial and chloroplast polymerases). Eukaryotic RNA polymerase I is essentially used to transcribe ribosomal RNA units, polymerase II is used for mRNA precursors, and III is used to transcribe 5S and tRNA genes. Each class of RNA polymerase is assembled from nine to fourteen different polypeptides. Members of the family include the largest subunit from eukaryotes; the gamma subunit from Cyanobacteria; the beta' subunit from bacteria; the A' subunit from archaea; and the B'' subunit from chloroplast RNA polymerases.

Gene Ontology

The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.

Domain organisation

Below is a listing of the unique domain organisations or architectures in which this domain is found. More...

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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...

View options

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
(33)
Full
(13383)
Representative proteomes NCBI
(9901)
Meta
(3260)
RP15
(671)
RP35
(1188)
RP55
(1598)
RP75
(1887)
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Pfam viewer View  View             

1Cannot generate PP/Heatmap alignments for seeds; no PP data available

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

Format an alignment

  Seed
(33)
Full
(13383)
Representative proteomes NCBI
(9901)
Meta
(3260)
RP15
(671)
RP35
(1188)
RP55
(1598)
RP75
(1887)
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
(33)
Full
(13383)
Representative proteomes NCBI
(9901)
Meta
(3260)
RP15
(671)
RP35
(1188)
RP55
(1598)
RP75
(1887)
Raw Stockholm Download   Download   Download   Download   Download   Download   Download   Download  
Gzipped Download   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.

Pfam alignments:

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

Seed source: Manual
Previous IDs: none
Type: Domain
Author: Finn RD
Number in seed: 33
Number in full: 13383
Average length of the domain: 133.80 aa
Average identity of full alignment: 57 %
Average coverage of the sequence by the domain: 17.84 %

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 23.4 23.4
Trusted cut-off 24.5 23.6
Noise cut-off 22.9 23.2
Model length: 166
Family (HMM) version: 15
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 are 10 interactions for this family. More...

RNA_pol_Rpb1_3 Sigma70_r3 RNA_pol_Rpb2_6 RNA_pol_Rpb2_7 RNA_pol_Rpb1_5 TFIIS_C SHS2_Rpb7-N RNA_pol_L RNA_pol_Rpb6 RNA_pol_Rpb1_1

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 RNA_pol_Rpb1_2 domain has been found. There are 137 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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