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Entry version 115 (29 Sep 2021)
Sequence version 1 (05 Jul 2004)
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Protein

Keratin, type II cytoskeletal 8

Gene

krt8

Organism
Danio rerio (Zebrafish) (Brachydanio rerio)
Status
Reviewed-Annotation score:

Annotation score:3 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

Together with KRT19, helps to link the contractile apparatus to dystrophin at the costameres of striated muscle.

By similarity

Miscellaneous

There are two types of cytoskeletal and microfibrillar keratin: I (acidic; 40-55 kDa) and II (neutral to basic; 56-70 kDa).

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection describes interesting single amino acid sites on the sequence that are not defined in any other subsection. This subsection can be displayed in different sections ('Function', 'PTM / Processing', 'Pathology and Biotech') according to its content.<p><a href='/help/site' target='_top'>More...</a></p>Sitei366StutterSequence analysis1

Enzyme and pathway databases

Reactome - a knowledgebase of biological pathways and processes

More...
Reactomei
R-DRE-6805567, Keratinization
R-DRE-6809371, Formation of the cornified envelope

<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_and_taxonomy_section">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:
Keratin, type II cytoskeletal 8
Alternative name(s):
Cytokeratin-8
Short name:
CK-8
Keratin-8
Short name:
K8
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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:krt8Imported
Synonyms:krt2-8
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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>OrganismiDanio rerio (Zebrafish) (Brachydanio rerio)
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 identifieri7955 [NCBI]
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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 lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiActinopterygiiNeopterygiiTeleosteiOstariophysiCypriniformesDanionidaeDanioninaeDanio
<p>This subsection of the <a href="http://www.uniprot.org/help/names_and_taxonomy_section">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
  • UP000000437 <p>A UniProt <a href="http://www.uniprot.org/manual/proteomes_manual">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 23

Organism-specific databases

Zebrafish Information Network genome database

More...
ZFINi
ZDB-GENE-030411-5, krt8

<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

<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>Keywords - Cellular componenti

Cytoplasm, Intermediate filament, Keratin, Nucleus

<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_00002286761 – 520Keratin, type II cytoskeletal 8Add BLAST520

Amino acid modifications

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'PTM / Processing' section specifies the position and type of each modified residue excluding <a href="http://www.uniprot.org/manual/lipid">lipids</a>, <a href="http://www.uniprot.org/manual/carbohyd">glycans</a> and <a href="http://www.uniprot.org/manual/crosslnk">protein cross-links</a>.<p><a href='/help/mod_res' target='_top'>More...</a></p>Modified residuei28Phosphoserine1 Publication1

Keywords - PTMi

Phosphoprotein

Proteomic databases

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

More...
PaxDbi
Q6NWF6

PRoteomics IDEntifications database

More...
PRIDEi
Q6NWF6

PTM databases

iPTMnet integrated resource for PTMs in systems biology context

More...
iPTMneti
Q6NWF6

<p>This section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms.<p><a href='/help/expression_section' target='_top'>More...</a></p>Expressioni

<p>This subsection of the 'Expression' section provides information on the expression of a gene at the mRNA or protein level in cells or in tissues of multicellular organisms. By default, the information is derived from experiments at the mRNA level, unless specified 'at protein level'.<br></br>Examples: <a href="http://www.uniprot.org/uniprot/P92958#expression">P92958</a>, <a href="http://www.uniprot.org/uniprot/Q8TDN4#expression">Q8TDN4</a>, <a href="http://www.uniprot.org/uniprot/O14734#expression">O14734</a><p><a href='/help/tissue_specificity' target='_top'>More...</a></p>Tissue specificityi

Expressed in simple epithelia.1 Publication

Gene expression databases

Bgee dataBase for Gene Expression Evolution

More...
Bgeei
ENSDARG00000058358, Expressed in multi-cellular organism and 41 other tissues

<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_section">'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_section">'Function'</a> section).<p><a href='/help/subunit_structure' target='_top'>More...</a></p>Subunit structurei

Heterotetramer of two type I and two type II keratins. Keratin-8 associates with keratin-18 (By similarity).

By similarity

Protein-protein interaction databases

Protein interaction database and analysis system

More...
IntActi
Q6NWF6, 1 interactor

STRING: functional protein association networks

More...
STRINGi
7955.ENSDARP00000075658

<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

3D structure databases

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

More...
SMRi
Q6NWF6

Database of comparative protein structure models

More...
ModBasei
Search...

<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_and_domains_section">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>Domaini115 – 426IF rodPROSITE-ProRule annotationAdd BLAST312

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
<p>This subsection of the 'Family and Domains' section describes a region of interest that cannot be described in other subsections.<p><a href='/help/region' target='_top'>More...</a></p>Regioni1 – 20DisorderedSequence analysisAdd BLAST20
Regioni2 – 114HeadSequence analysisAdd BLAST113
Regioni115 – 150Coil 1ASequence analysisAdd BLAST36
Regioni151 – 166Linker 1Sequence analysisAdd BLAST16
Regioni168 – 259Coil 1BSequence analysisAdd BLAST92
Regioni260 – 283Linker 12Sequence analysisAdd BLAST24
Regioni284 – 422Coil 2Sequence analysisAdd BLAST139
Regioni423 – 520TailSequence analysisAdd BLAST98

<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 intermediate filament family.PROSITE-ProRule annotation

Keywords - Domaini

Coiled coil

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
ENOG502QURK, Eukaryota

Ensembl GeneTree

More...
GeneTreei
ENSGT00940000161090

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...
HOGENOMi
CLU_012560_5_4_1

InParanoid: Eukaryotic Ortholog Groups

More...
InParanoidi
Q6NWF6

Identification of Orthologs from Complete Genome Data

More...
OMAi
RTECENE

Database of Orthologous Groups

More...
OrthoDBi
824246at2759

Database for complete collections of gene phylogenies

More...
PhylomeDBi
Q6NWF6

TreeFam database of animal gene trees

More...
TreeFami
TF317854

Family and domain databases

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR018039, IF_conserved
IPR039008, IF_rod_dom
IPR032444, Keratin_2_head
IPR003054, Keratin_II

Pfam protein domain database

More...
Pfami
View protein in Pfam
PF00038, Filament, 1 hit
PF16208, Keratin_2_head, 1 hit

Protein Motif fingerprint database; a protein domain database

More...
PRINTSi
PR01276, TYPE2KERATIN

Simple Modular Architecture Research Tool; a protein domain database

More...
SMARTi
View protein in SMART
SM01391, Filament, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS00226, IF_ROD_1, 1 hit
PS51842, IF_ROD_2, 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_length">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>Sequence (1+)i

<p>This subsection of the <a href="http://www.uniprot.org/help/sequences_section">Sequence</a> section indicates if the <a href="http://www.uniprot.org/help/canonical_and_isoforms">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.

This entry has 1 described isoform and 1 potential isoform that is computationally mapped.Show allAlign All

Q6NWF6-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MSTYSKKTSY TVKSSSSGSI PRNFSSLSYS GPSMSRQSYS ARSSYGGVNR
60 70 80 90 100
GMGAGMGGGS GFISSSSAYG LGMGMGTGMG AGVVAPIQAV TVNKSLLAPL
110 120 130 140 150
NLEIDPNIQI VRTQEKEQIK TLNNRFASFI DKVRFLEQQN KMLETKWSLL
160 170 180 190 200
QNQTATRSNI DAMFEAYIAN LRRQLDSLGN DKMKLEADLH NMQGLVEDFK
210 220 230 240 250
NKYEDEINKR TECENEFVLI KKDVDEAYMN KVELEAKLES LTDEINFLRQ
260 270 280 290 300
IFEEEIRELQ SQIKDTSVVV EMDNSRNLDM DAIVAEVRAQ YEDIANRSRA
310 320 330 340 350
EAEMWYKSKY EEMQTSANKY GDDLRSTKTE IADLNRMIQR LQSEIDAVKG
360 370 380 390 400
QRANLENQIA EAEERGEMAV RDAKGRIKDL EDALQRAKQD MARQIREYQD
410 420 430 440 450
LMNVKLALDI EIATYRKLLE GEEDRLATGI KAINISKQST SYGGYPMESA
460 470 480 490 500
GSSYSTYSSG YSSGLSGGYG GGYSGGYSGG YSSGSGYSDT VSQTKKSVVI
510 520
KMIETKDGRV VSESSEVVQD
Length:520
Mass (Da):57,760
Last modified:July 5, 2004 - v1
<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:i0E39BECA0E494181
GO

<p>In eukaryotic reference proteomes, unreviewed entries that are likely to belong to the same gene are computationally mapped, based on gene identifiers from Ensembl, EnsemblGenomes and model organism databases.<p><a href='/help/gene_centric_isoform_mapping' target='_top'>More...</a></p>Computationally mapped potential isoform sequencesi

There is 1 potential isoform mapped to this entry.BLASTAlignShow allAdd to basket
EntryEntry nameProtein names
Gene namesLengthAnnotation
A0A2R8Q6V3A0A2R8Q6V3_DANRE
Keratin, type II cytoskeletal 8
krt8
516Annotation score:

Annotation score:1 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>

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
AY423000 mRNA Translation: AAQ97976.1
BC067610 mRNA Translation: AAH67610.1
AJ460000 mRNA Translation: CAD31062.1

NCBI Reference Sequences

More...
RefSeqi
NP_956374.1, NM_200080.2

Genome annotation databases

Ensembl eukaryotic genome annotation project

More...
Ensembli
ENSDART00000081215; ENSDARP00000075658; ENSDARG00000058358

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
797433

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
dre:797433

<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
AY423000 mRNA Translation: AAQ97976.1
BC067610 mRNA Translation: AAH67610.1
AJ460000 mRNA Translation: CAD31062.1
RefSeqiNP_956374.1, NM_200080.2

3D structure databases

SMRiQ6NWF6
ModBaseiSearch...

Protein-protein interaction databases

IntActiQ6NWF6, 1 interactor
STRINGi7955.ENSDARP00000075658

PTM databases

iPTMnetiQ6NWF6

Proteomic databases

PaxDbiQ6NWF6
PRIDEiQ6NWF6

Genome annotation databases

EnsembliENSDART00000081215; ENSDARP00000075658; ENSDARG00000058358
GeneIDi797433
KEGGidre:797433

Organism-specific databases

Comparative Toxicogenomics Database

More...
CTDi
3856
ZFINiZDB-GENE-030411-5, krt8

Phylogenomic databases

eggNOGiENOG502QURK, Eukaryota
GeneTreeiENSGT00940000161090
HOGENOMiCLU_012560_5_4_1
InParanoidiQ6NWF6
OMAiRTECENE
OrthoDBi824246at2759
PhylomeDBiQ6NWF6
TreeFamiTF317854

Enzyme and pathway databases

ReactomeiR-DRE-6805567, Keratinization
R-DRE-6809371, Formation of the cornified envelope

Miscellaneous databases

Protein Ontology

More...
PROi
PR:Q6NWF6

Gene expression databases

BgeeiENSDARG00000058358, Expressed in multi-cellular organism and 41 other tissues

Family and domain databases

InterProiView protein in InterPro
IPR018039, IF_conserved
IPR039008, IF_rod_dom
IPR032444, Keratin_2_head
IPR003054, Keratin_II
PfamiView protein in Pfam
PF00038, Filament, 1 hit
PF16208, Keratin_2_head, 1 hit
PRINTSiPR01276, TYPE2KERATIN
SMARTiView protein in SMART
SM01391, Filament, 1 hit
PROSITEiView protein in PROSITE
PS00226, IF_ROD_1, 1 hit
PS51842, IF_ROD_2, 1 hit

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 nameiK2C8_DANRE
<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: Q6NWF6
Secondary accession number(s): Q7ZT78
<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_and_isoforms">canonical sequence</a> are also displayed.<p><a href='/help/entry_history' target='_top'>More...</a></p>Entry historyiIntegrated into UniProtKB/Swiss-Prot: March 21, 2006
Last sequence update: July 5, 2004
Last modified: September 29, 2021
This is version 115 of the entry and version 1 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 programChordata 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

Reference proteome

Documents

  1. SIMILARITY comments
    Index of protein domains and families
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