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UniProtKB - P09029 (PURK_ECOLI)

Entry version 168 (17 Jun 2020)
Sequence version 2 (01 Nov 1997)
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Protein

N5-carboxyaminoimidazole ribonucleotide synthase

Gene

purK

Organism
Escherichia coli (strain K12)
Status
Reviewed-Annotation score:

Annotation score:5 out of 5

<p>The annotation score provides a heuristic measure of the annotation content of a UniProtKB entry or proteome. This score <strong>cannot</strong> be used as a measure of the accuracy of the annotation as we cannot define the 'correct annotation' for any given protein.<p><a href='/help/annotation_score' target='_top'>More...</a></p>-Experimental evidence at protein leveli <p>This indicates the type of evidence that supports the existence of the protein. Note that the 'protein existence' evidence does not give information on the accuracy or correctness of the sequence(s) displayed.<p><a href='/help/protein_existence' target='_top'>More...</a></p>

<p>This section provides any useful information about the protein, mostly biological knowledge.<p><a href='/help/function_section' target='_top'>More...</a></p>Functioni

Catalyzes the ATP-dependent conversion of 5-aminoimidazole ribonucleotide (AIR) and HCO3- to N5-carboxyaminoimidazole ribonucleotide (N5-CAIR).UniRule annotation1 Publication

Caution

Was originally thought to be the ATPase subunit of phosphoribosylaminoimidazole carboxylase, with catalytic subunit PurE.1 Publication

<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the catalytic activity of an enzyme, i.e. a chemical reaction that the enzyme catalyzes.<p><a href='/help/catalytic_activity' target='_top'>More...</a></p>Catalytic activityi

<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">'Function'</a> section describes the metabolic pathway(s) associated with a protein.<p><a href='/help/pathway' target='_top'>More...</a></p>Pathwayi: IMP biosynthesis via de novo pathway

This protein is involved in step 1 of the subpathway that synthesizes 5-amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxylate from 5-amino-1-(5-phospho-D-ribosyl)imidazole (N5-CAIR route).UniRule annotation1 Publication
Proteins known to be involved in the 2 steps of the subpathway in this organism are:
  1. N5-carboxyaminoimidazole ribonucleotide synthase (purK), N5-carboxyaminoimidazole ribonucleotide synthase (purK)
  2. N5-carboxyaminoimidazole ribonucleotide mutase (purE), N5-carboxyaminoimidazole ribonucleotide mutase (purE)
This subpathway is part of the pathway IMP biosynthesis via de novo pathway, which is itself part of Purine metabolism.
View all proteins of this organism that are known to be involved in the subpathway that synthesizes 5-amino-1-(5-phospho-D-ribosyl)imidazole-4-carboxylate from 5-amino-1-(5-phospho-D-ribosyl)imidazole (N5-CAIR route), the pathway IMP biosynthesis via de novo pathway and in Purine metabolism.

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes the interaction between a single amino acid and another chemical entity. Priority is given to the annotation of physiological ligands.<p><a href='/help/binding' target='_top'>More...</a></p>Binding sitei80ATPUniRule annotation2 Publications1
Binding sitei120ATPUniRule annotation2 Publications1
Binding sitei161ATPUniRule annotation2 Publications1
Binding sitei184ATPUniRule annotation2 Publications1

Regions

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/function%5Fsection">Function</a> section describes a region in the protein which binds nucleotide phosphates. It always involves more than one amino acid and includes all residues involved in nucleotide-binding.<p><a href='/help/np_bind' target='_top'>More...</a></p>Nucleotide bindingi125 – 131ATPUniRule annotation2 Publications7
Nucleotide bindingi153 – 156ATPUniRule annotation2 Publications4
Nucleotide bindingi237 – 238ATPUniRule annotation2 Publications2

<p>The <a href="http://www.geneontology.org/">Gene Ontology (GO)</a> project provides a set of hierarchical controlled vocabulary split into 3 categories:<p><a href='/help/gene_ontology' target='_top'>More...</a></p>GO - Molecular functioni

Complete GO annotation on QuickGO ...

GO - Biological processi

Complete GO annotation on QuickGO ...

<p>UniProtKB Keywords constitute a <a href="http://www.uniprot.org/keywords">controlled vocabulary</a> with a hierarchical structure. Keywords summarise the content of a UniProtKB entry and facilitate the search for proteins of interest.<p><a href='/help/keywords' target='_top'>More...</a></p>Keywordsi

Molecular functionLigase
Biological processPurine biosynthesis
LigandATP-binding, Nucleotide-binding

Enzyme and pathway databases

BioCyc Collection of Pathway/Genome Databases

More...BioCyci		EcoCyc:PURK-MONOMER
ECOL316407:JW0511-MONOMER
MetaCyc:PURK-MONOMER

BRENDA Comprehensive Enzyme Information System

More...BRENDAi		6.3.4.18 2026

UniPathway: a resource for the exploration and annotation of metabolic pathways

More...UniPathwayi		UPA00074;UER00942

<p>This section provides information about the protein and gene name(s) and synonym(s) and about the organism that is the source of the protein sequence.<p><a href='/help/names_and_taxonomy_section' target='_top'>More...</a></p>Names & Taxonomyi

<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides an exhaustive list of all names of the protein, from commonly used to obsolete, to allow unambiguous identification of a protein.<p><a href='/help/protein_names' target='_top'>More...</a></p>Protein namesi
Recommended name:
N5-carboxyaminoimidazole ribonucleotide synthaseUniRule annotationCurated (EC:6.3.4.18UniRule annotation1 Publication)
Short name:
N5-CAIR synthaseUniRule annotationCurated
Alternative name(s):
5-(carboxyamino)imidazole ribonucleotide synthetaseUniRule annotationCurated
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section indicates the name(s) of the gene(s) that code for the protein sequence(s) described in the entry. Four distinct tokens exist: 'Name', 'Synonyms', 'Ordered locus names' and 'ORF names'.<p><a href='/help/gene_name' target='_top'>More...</a></p>Gene namesi
Name:purKUniRule annotation
Ordered Locus Names:b0522Imported, JW0511Imported
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section provides information on the name(s) of the organism that is the source of the protein sequence.<p><a href='/help/organism-name' target='_top'>More...</a></p>OrganismiEscherichia coli (strain K12)
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section shows the unique identifier assigned by the NCBI to the source organism of the protein. This is known as the 'taxonomic identifier' or 'taxid'.<p><a href='/help/taxonomic_identifier' target='_top'>More...</a></p>Taxonomic identifieri83333 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section contains the taxonomic hierarchical classification lineage of the source organism. It lists the nodes as they appear top-down in the taxonomic tree, with the more general grouping listed first.<p><a href='/help/taxonomic_lineage' target='_top'>More...</a></p>Taxonomic lineageiBacteria › Proteobacteria › Gammaproteobacteria › Enterobacterales › Enterobacteriaceae › Escherichia ›
<p>This subsection of the <a href="http://www.uniprot.org/help/names%5Fand%5Ftaxonomy%5Fsection">Names and taxonomy</a> section is present for entries that are part of a <a href="http://www.uniprot.org/proteomes">proteome</a>, i.e. of a set of proteins thought to be expressed by organisms whose genomes have been completely sequenced.<p><a href='/help/proteomes_manual' target='_top'>More...</a></p>Proteomesi
  • UP000000318 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes%5Fmanual">proteome</a> can consist of several components.<br></br>The component name refers to the genomic component encoding a set of proteins.<p><a href='/help/proteome_component' target='_top'>More...</a></p> Componenti: Chromosome
  • UP000000625 Componenti: Chromosome

<p>This section provides information on the location and the topology of the mature protein in the cell.<p><a href='/help/subcellular_location_section' target='_top'>More...</a></p>Subcellular locationi

GO - Cellular componenti

Complete GO annotation on QuickGO ...

<p>This section describes post-translational modifications (PTMs) and/or processing events.<p><a href='/help/ptm_processing_section' target='_top'>More...</a></p>PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section describes the extent of a polypeptide chain in the mature protein following processing or proteolytic cleavage.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00000749971 – 355N5-carboxyaminoimidazole ribonucleotide synthaseAdd BLAST355

Proteomic databases

jPOST - Japan Proteome Standard Repository/Database

More...jPOSTi		P09029

PaxDb, a database of protein abundance averages across all three domains of life

More...PaxDbi		P09029

PRoteomics IDEntifications database

More...PRIDEi		P09029

2D gel databases

Two-dimensional polyacrylamide gel electrophoresis database from the Geneva University Hospital

More...SWISS-2DPAGEi		P09029

<p>This section provides information on the quaternary structure of a protein and on interaction(s) with other proteins or protein complexes.<p><a href='/help/interaction_section' target='_top'>More...</a></p>Interactioni

<p>This subsection of the <a href="http://www.uniprot.org/help/interaction%5Fsection">'Interaction'</a> section provides information about the protein quaternary structure and interaction(s) with other proteins or protein complexes (with the exception of physiological receptor-ligand interactions which are annotated in the <a href="http://www.uniprot.org/help/function%5Fsection">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

Homodimer.

UniRule annotation2 Publications

Protein-protein interaction databases

The Biological General Repository for Interaction Datasets (BioGRID)

More...BioGRIDi		4259875, 17 interactors

Protein interaction database and analysis system

More...IntActi		P09029, 5 interactors

STRING: functional protein association networks

More...STRINGi		511145.b0522

<p>This section provides information on the tertiary and secondary structure of a protein.<p><a href='/help/structure_section' target='_top'>More...</a></p>Structurei

Secondary structure

1355
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details

3D structure databases

SWISS-MODEL Repository - a database of annotated 3D protein structure models

More...SMRi		P09029

Database of comparative protein structure models

More...ModBasei		Search...

Protein Data Bank in Europe - Knowledge Base

More...PDBe-KBi		Search...

Miscellaneous databases

Relative evolutionary importance of amino acids within a protein sequence

More...EvolutionaryTracei		P09029

<p>This section provides information on sequence similarities with other proteins and the domain(s) present in a protein.<p><a href='/help/family_and_domains_section' target='_top'>More...</a></p>Family & Domainsi

Domains and Repeats

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the <a href="http://www.uniprot.org/help/family%5Fand%5Fdomains%5Fsection">Family and Domains</a> section describes the position and type of a domain, which is defined as a specific combination of secondary structures organized into a characteristic three-dimensional structure or fold.<p><a href='/help/domain' target='_top'>More...</a></p>Domaini84 – 267ATP-graspUniRule annotationAdd BLAST184

<p>This subsection of the 'Family and domains' section provides information about the sequence similarity with other proteins.<p><a href='/help/sequence_similarities' target='_top'>More...</a></p>Sequence similaritiesi

Belongs to the PurK/PurT family.UniRule annotationCurated

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...eggNOGi		ENOG4105CY8 Bacteria
COG0026 LUCA

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...HOGENOMi		CLU_011534_0_0_6

InParanoid: Eukaryotic Ortholog Groups

More...InParanoidi		P09029

KEGG Orthology (KO)

More...KOi		K01589

Database for complete collections of gene phylogenies

More...PhylomeDBi		P09029

Family and domain databases

Gene3D Structural and Functional Annotation of Protein Families

More...Gene3Di		3.30.1490.20, 1 hit

HAMAP database of protein families

More...HAMAPi		MF_01928 PurK, 1 hit

Integrated resource of protein families, domains and functional sites

More...InterProi		View protein in InterPro
IPR011761 ATP-grasp
IPR003135 ATP-grasp_carboxylate-amine
IPR013815 ATP_grasp_subdomain_1
IPR016185 PreATP-grasp_dom_sf
IPR005875 PurK
IPR040686 PurK_C
IPR011054 Rudment_hybrid_motif

Pfam protein domain database

More...Pfami		View protein in Pfam
PF02222 ATP-grasp, 1 hit
PF17769 PurK_C, 1 hit

Superfamily database of structural and functional annotation

More...SUPFAMi		SSF51246 SSF51246, 1 hit
SSF52440 SSF52440, 1 hit

TIGRFAMs; a protein family database

More...TIGRFAMsi		TIGR01161 purK, 1 hit

PROSITE; a protein domain and family database

More...PROSITEi		View protein in PROSITE
PS50975 ATP_GRASP, 1 hit

<p>This section displays by default the canonical protein sequence and upon request all isoforms described in the entry. It also includes information pertinent to the sequence(s), including <a href="http://www.uniprot.org/help/sequence%5Flength">length</a> and <a href="http://www.uniprot.org/help/sequences">molecular weight</a>. The information is filed in different subsections. The current subsections and their content are listed below:<p><a href='/help/sequences_section' target='_top'>More...</a></p>Sequencei

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences%5Fsection">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> displayed by default in the entry is complete or not.<p><a href='/help/sequence_status' target='_top'>More...</a></p>Sequence statusi: Complete.

P09029-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MKQVCVLGNG QLGRMLRQAG EPLGIAVWPV GLDAEPAAVP FQQSVITAEI 
        60         70         80         90        100
ERWPETALTR ELARHPAFVN RDVFPIIADR LTQKQLFDKL HLPTAPWQLL 
       110        120        130        140        150
AERSEWPAVF DRLGELAIVK RRTGGYDGRG QWRLRANETE QLPAECYGEC 
       160        170        180        190        200
IVEQGINFSG EVSLVGARGF DGSTVFYPLT HNLHQDGILR TSVAFPQANA 
       210        220        230        240        250
QQQAQAEEML SAIMQELGYV GVMAMECFVT PQGLLINELA PRVHNSGHWT 
       260        270        280        290        300
QNGASISQFE LHLRAITDLP LPQPVVNNPS VMINLIGSDV NYDWLKLPLV 
       310        320        330        340        350
HLHWYDKEVR PGRKVGHLNL TDSDTSRLTA TLEALIPLLP PEYASGVIWA 

QSKFG
Length:355
Mass (Da):39,461
Last modified:November 1, 1997 - v2
<p>The checksum is a form of redundancy check that is calculated from the sequence. It is useful for tracking sequence updates.</p> <p>It should be noted that while, in theory, two different sequences could have the same checksum value, the likelihood that this would happen is extremely low.</p> <p>However UniProtKB may contain entries with identical sequences in case of multiple genes (paralogs).</p> <p>The checksum is computed as the sequence 64-bit Cyclic Redundancy Check value (CRC64) using the generator polynomial: x<sup>64</sup> + x<sup>4</sup> + x<sup>3</sup> + x + 1. The algorithm is described in the ISO 3309 standard. </p> <p class="publication">Press W.H., Flannery B.P., Teukolsky S.A. and Vetterling W.T.<br /> <strong>Cyclic redundancy and other checksums</strong><br /> <a href="http://www.nrbook.com/b/bookcpdf.php">Numerical recipes in C 2nd ed., pp896-902, Cambridge University Press (1993)</a>)</p> Checksum:i93464E111E29AD9C
GO

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Sequence' section reports difference(s) between the canonical sequence (displayed by default in the entry) and the different sequence submissions merged in the entry. These various submissions may originate from different sequencing projects, different types of experiments, or different biological samples. Sequence conflicts are usually of unknown origin.<p><a href='/help/conflict' target='_top'>More...</a></p>Sequence conflicti64 – 65RH → PD in CAA31421 (PubMed:2464576).Curated2

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...EMBLi

GenBank nucleotide sequence database

More...GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...DDBJi
Links Updated
X12982 Genomic DNA Translation: CAA31421.1
M19657 Genomic DNA Translation: AAA24450.1
U82664 Genomic DNA Translation: AAB40275.1
U00096 Genomic DNA Translation: AAC73624.1
AP009048 Genomic DNA Translation: BAE76299.1

Protein sequence database of the Protein Information Resource

More...PIRi		JU0001 DCECPK

NCBI Reference Sequences

More...RefSeqi		NP_415055.1, NC_000913.3
WP_000815571.1, NZ_LN832404.1

Genome annotation databases

Ensembl bacterial and archaeal genome annotation project

More...EnsemblBacteriai		AAC73624; AAC73624; b0522
BAE76299; BAE76299; BAE76299

Database of genes from NCBI RefSeq genomes

More...GeneIDi		945153

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...KEGGi		ecj:JW0511
eco:b0522

Pathosystems Resource Integration Center (PATRIC)

More...PATRICi		fig|1411691.4.peg.1756

<p>This section provides links to proteins that are similar to the protein sequence(s) described in this entry at different levels of sequence identity thresholds (100%, 90% and 50%) based on their membership in UniProt Reference Clusters (<a href="http://www.uniprot.org/help/uniref">UniRef</a>).<p><a href='/help/similar_proteins_section' target='_top'>More...</a></p>Similar proteinsi

<p>This section is used to point to information related to entries and found in data collections other than UniProtKB.<p><a href='/help/cross_references_section' target='_top'>More...</a></p>Cross-referencesi

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
X12982 Genomic DNA Translation: CAA31421.1
M19657 Genomic DNA Translation: AAA24450.1
U82664 Genomic DNA Translation: AAB40275.1
U00096 Genomic DNA Translation: AAC73624.1
AP009048 Genomic DNA Translation: BAE76299.1
PIRiJU0001 DCECPK
RefSeqiNP_415055.1, NC_000913.3
WP_000815571.1, NZ_LN832404.1

3D structure databases

Select the link destinations:

Protein Data Bank Europe

More...PDBei

Protein Data Bank RCSB

More...RCSB PDBi

Protein Data Bank Japan

More...PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1B6RX-ray2.10A1-355[»]
1B6SX-ray2.50A/B/C/D1-355[»]
3ETHX-ray1.60A/B1-355[»]
3ETJX-ray1.60A/B1-355[»]
SMRiP09029
ModBaseiSearch...
PDBe-KBiSearch...

Protein-protein interaction databases

BioGRIDi4259875, 17 interactors
IntActiP09029, 5 interactors
STRINGi511145.b0522

2D gel databases

SWISS-2DPAGEiP09029

Proteomic databases

jPOSTiP09029
PaxDbiP09029
PRIDEiP09029

Genome annotation databases

EnsemblBacteriaiAAC73624; AAC73624; b0522
BAE76299; BAE76299; BAE76299
GeneIDi945153
KEGGiecj:JW0511
eco:b0522
PATRICifig|1411691.4.peg.1756

Organism-specific databases

EchoBASE - an integrated post-genomic database for E. coli

More...EchoBASEi		EB0789

Phylogenomic databases

eggNOGiENOG4105CY8 Bacteria
COG0026 LUCA
HOGENOMiCLU_011534_0_0_6
InParanoidiP09029
KOiK01589
PhylomeDBiP09029

Enzyme and pathway databases

UniPathwayiUPA00074;UER00942
BioCyciEcoCyc:PURK-MONOMER
ECOL316407:JW0511-MONOMER
MetaCyc:PURK-MONOMER
BRENDAi6.3.4.18 2026

Miscellaneous databases

EvolutionaryTraceiP09029

Protein Ontology

More...PROi		PR:P09029

Family and domain databases

Gene3Di3.30.1490.20, 1 hit
HAMAPiMF_01928 PurK, 1 hit
InterProiView protein in InterPro
IPR011761 ATP-grasp
IPR003135 ATP-grasp_carboxylate-amine
IPR013815 ATP_grasp_subdomain_1
IPR016185 PreATP-grasp_dom_sf
IPR005875 PurK
IPR040686 PurK_C
IPR011054 Rudment_hybrid_motif
PfamiView protein in Pfam
PF02222 ATP-grasp, 1 hit
PF17769 PurK_C, 1 hit
SUPFAMiSSF51246 SSF51246, 1 hit
SSF52440 SSF52440, 1 hit
TIGRFAMsiTIGR01161 purK, 1 hit
PROSITEiView protein in PROSITE
PS50975 ATP_GRASP, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

More...ProtoNeti		Search...

MobiDB: a database of protein disorder and mobility annotations

More...MobiDBi		Search...

<p>This section provides general information on the entry.<p><a href='/help/entry_information_section' target='_top'>More...</a></p>Entry informationi

<p>This subsection of the 'Entry information' section provides a mnemonic identifier for a UniProtKB entry, but it is not a stable identifier. Each reviewed entry is assigned a unique entry name upon integration into UniProtKB/Swiss-Prot.<p><a href='/help/entry_name' target='_top'>More...</a></p>Entry nameiPURK_ECOLI
<p>This subsection of the 'Entry information' section provides one or more accession number(s). These are stable identifiers and should be used to cite UniProtKB entries. Upon integration into UniProtKB, each entry is assigned a unique accession number, which is called 'Primary (citable) accession number'.<p><a href='/help/accession_numbers' target='_top'>More...</a></p>AccessioniPrimary (citable) accession number: P09029
Secondary accession number(s): Q2MBQ7
<p>This subsection of the 'Entry information' section shows the date of integration of the entry into UniProtKB, the date of the last sequence update and the date of the last annotation modification ('Last modified'). The version number for both the entry and the <a href="http://www.uniprot.org/help/canonical%5Fand%5Fisoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: November 1, 1988
Last sequence update: November 1, 1997
Last modified: June 17, 2020
This is version 168 of the entry and version 2 of the sequence. See complete history.
<p>This subsection of the 'Entry information' section indicates whether the entry has been manually annotated and reviewed by UniProtKB curators or not, in other words, if the entry belongs to the Swiss-Prot section of UniProtKB (<strong>reviewed</strong>) or to the computer-annotated TrEMBL section (<strong>unreviewed</strong>).<p><a href='/help/entry_status' target='_top'>More...</a></p>Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programProkaryotic Protein Annotation Program

<p>This section contains any relevant information that doesn't fit in any other defined sections<p><a href='/help/miscellaneous_section' target='_top'>More...</a></p>Miscellaneousi

Keywords - Technical termi

3D-structure, Direct protein sequencing, Reference proteome

Documents

  1. PATHWAY comments
    Index of metabolic and biosynthesis pathways
  2. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  3. SIMILARITY comments
    Index of protein domains and families
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