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Entry version 133 (25 May 2022)
Sequence version 3 (23 Jan 2007)
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Protein

Histone H2B.3

Gene

At2g28720

Organism
Arabidopsis thaliana (Mouse-ear cress)
Status
Reviewed-Annotation score:

Annotation score:4 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

Core component of nucleosome. Nucleosomes wrap and compact DNA into chromatin, limiting DNA accessibility to the cellular machineries which require DNA as a template. Histones thereby play a central role in transcription regulation, DNA repair, DNA replication and chromosomal stability. DNA accessibility is regulated via a complex set of post-translational modifications of histones, also called histone code, and nucleosome remodeling.

Caution

To ensure consistency between histone entries, we follow the 'Brno' nomenclature for histone modifications, with positions referring to those used in the literature for the 'closest' model organism. Due to slight variations in histone sequences between organisms and to the presence of initiator methionine in UniProtKB/Swiss-Prot sequences, the actual positions of modified amino acids in the sequence generally differ. In this entry the following conventions are used: H2BK6ac = acetylated Lys-7; H2BK33ac = acetylated Lys-39; H2BK34ac = acetylated Lys-40; H2BK143ub1 = monoubiquitinated Lys-147.Curated

<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

GO - Biological processi

<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 functionDNA-binding

<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:
Histone H2B.3
Short name:
HTB3
<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
Ordered Locus Names:At2g28720
ORF Names:T11P11.3
<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>OrganismiArabidopsis thaliana (Mouse-ear cress)
<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 identifieri3702 [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 lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliopsidaeudicotyledonsGunneridaePentapetalaerosidsmalvidsBrassicalesBrassicaceaeCamelineaeArabidopsis
<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
  • UP000006548 <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 2

Organism-specific databases

Arabidopsis Information Portal

More...
Araporti
AT2G28720

The Arabidopsis Information Resource

More...
TAIRi
locus:2054553, AT2G28720

<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

Keywords - Cellular componenti

Chromosome, Nucleosome core, 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 <a href="http://www.uniprot.org/help/ptm%5Fprocessing%5Fsection">PTM / Processing</a> section indicates that the initiator methionine is cleaved from the mature protein.<p><a href='/help/init_met' target='_top'>More...</a></p>Initiator methionineiRemovedBy similarity
<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_00002386902 – 151Histone H2B.3Add BLAST150

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 residuei2N,N,N-trimethylalanine; alternateBy similarity1
Modified residuei2N,N-dimethylalanine; alternateBy similarity1
Modified residuei2N-methylalanine; alternateBy similarity1
Modified residuei4N6-methyllysineBy similarity1
Modified residuei7N6-acetyllysineBy similarity1
Modified residuei12N6-acetyllysineBy similarity1
Modified residuei13N6,N6-dimethyllysineBy similarity1
Modified residuei28N6-acetyllysineBy similarity1
Modified residuei33N6-acetyllysineBy similarity1
Modified residuei39N6-acetyllysineBy similarity1
Modified residuei40N6-acetyllysineBy similarity1
<p>This subsection of the <a href="http://www.uniprot.org/help/ptm%5Fprocessing%5Fsection">PTM / Processing</a> section describes <strong>covalent linkages</strong> of various types formed <strong>between two proteins (interchain cross-links)</strong> or <strong>between two parts of the same protein (intrachain cross-links)</strong>, except the disulfide bonds that are annotated in the <a href="http://www.uniprot.org/manual/disulfid">'Disulfide bond'</a> subsection.<p><a href='/help/crosslnk' target='_top'>More...</a></p>Cross-linki147Glycyl lysine isopeptide (Lys-Gly) (interchain with G-Cter in ubiquitin)By similarity

<p>This subsection of the <a href="http://www.uniprot.org/help/ptm%5Fprocessing%5Fsection">PTM/processing</a> section describes post-translational modifications (PTMs). This subsection <strong>complements</strong> the information provided at the sequence level or describes modifications for which <strong>position-specific data is not yet available</strong>.<p><a href='/help/post-translational_modification' target='_top'>More...</a></p>Post-translational modificationi

Can be acetylated to form H2BK6ac, H2BK33ac and H2BK34ac.By similarity
Monoubiquitinated by BRE1 to form H2BK143ub1 and deubiquitinated by UBP26. Required for heterochromatic histone H3 di- and trimethylation at H3K4me. May give a specific tag for epigenetic transcriptional activation.

Keywords - PTMi

Acetylation, Isopeptide bond, Methylation, Ubl conjugation

Proteomic databases

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

More...
PaxDbi
Q9SI96

PRoteomics IDEntifications database

More...
PRIDEi
Q9SI96

ProteomicsDB: a multi-organism proteome resource

More...
ProteomicsDBi
247157

PTM databases

iPTMnet integrated resource for PTMs in systems biology context

More...
iPTMneti
Q9SI96

<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

Gene expression databases

ExpressionAtlas, Differential and Baseline Expression

More...
ExpressionAtlasi
Q9SI96, baseline and differential

Genevisible search portal to normalized and curated expression data from Genevestigator

More...
Genevisiblei
Q9SI96, AT

<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

The nucleosome is a histone octamer containing two molecules each of H2A, H2B, H3 and H4 assembled in one H3-H4 heterotetramer and two H2A-H2B heterodimers. The octamer wraps approximately 147 bp of DNA.

GO - Molecular functioni

Protein-protein interaction databases

STRING: functional protein association networks

More...
STRINGi
3702.AT2G28720.1

<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

AlphaFold Protein Structure Database

More...
AlphaFoldDBi
Q9SI96

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

More...
SMRi
Q9SI96

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

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 – 54DisorderedSequence analysisAdd BLAST54

<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 histone H2B family.Curated

Phylogenomic databases

evolutionary genealogy of genes: Non-supervised Orthologous Groups

More...
eggNOGi
KOG1744, Eukaryota

The HOGENOM Database of Homologous Genes from Fully Sequenced Organisms

More...
HOGENOMi
CLU_075666_1_3_1

InParanoid: Eukaryotic Ortholog Groups

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InParanoidi
Q9SI96

Identification of Orthologs from Complete Genome Data

More...
OMAi
DIFDRMA

Database of Orthologous Groups

More...
OrthoDBi
1536672at2759

Database for complete collections of gene phylogenies

More...
PhylomeDBi
Q9SI96

Family and domain databases

Gene3D Structural and Functional Annotation of Protein Families

More...
Gene3Di
1.10.20.10, 1 hit

Integrated resource of protein families, domains and functional sites

More...
InterProi
View protein in InterPro
IPR009072, Histone-fold
IPR007125, Histone_H2A/H2B/H3
IPR000558, Histone_H2B

The PANTHER Classification System

More...
PANTHERi
PTHR23428, PTHR23428, 1 hit

Pfam protein domain database

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Pfami
View protein in Pfam
PF00125, Histone, 1 hit

Protein Motif fingerprint database; a protein domain database

More...
PRINTSi
PR00621, HISTONEH2B

Simple Modular Architecture Research Tool; a protein domain database

More...
SMARTi
View protein in SMART
SM00427, H2B, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF47113, SSF47113, 1 hit

PROSITE; a protein domain and family database

More...
PROSITEi
View protein in PROSITE
PS00357, HISTONE_H2B, 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.

<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 in its mature form or if it represents the precursor.<p><a href='/help/sequence_processing' target='_top'>More...</a></p>Sequence processingi: The displayed sequence is further processed into a mature form.

Q9SI96-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MAPKAGKKPA EKKPAEKAPA EEEKVAEKAP AEKKPKAGKK LPKEAVTGGV
60 70 80 90 100
EKKKKRVKKS TETYKIYIFK VLKQVHPDIG ISSKAMGIMN SFINDIFEKL
110 120 130 140 150
AQEASKLARY NKKPTITSRE IQTAVRLVLP GELAKHAVSE GTKAVTKFTS

S
Length:151
Mass (Da):16,529
Last modified:January 23, 2007 - v3
<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:i2A79E7172E52D9CE
GO

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

More...
EMBLi

GenBank nucleotide sequence database

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GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...
DDBJi
Links Updated
AC007184 Genomic DNA Translation: AAD24363.1
CP002685 Genomic DNA Translation: AEC08163.1
AY124835 mRNA Translation: AAM70544.1
AY057605 mRNA Translation: AAL14400.1
AF325075 mRNA Translation: AAK17143.1
AY085391 mRNA Translation: AAM62619.1

Protein sequence database of the Protein Information Resource

More...
PIRi
D84688

NCBI Reference Sequences

More...
RefSeqi
NP_180440.1, NM_128433.4

Genome annotation databases

Ensembl plant genome annotation project

More...
EnsemblPlantsi
AT2G28720.1; AT2G28720.1; AT2G28720

Database of genes from NCBI RefSeq genomes

More...
GeneIDi
817421

Gramene; a comparative resource for plants

More...
Gramenei
AT2G28720.1; AT2G28720.1; AT2G28720

KEGG: Kyoto Encyclopedia of Genes and Genomes

More...
KEGGi
ath:AT2G28720

<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
AC007184 Genomic DNA Translation: AAD24363.1
CP002685 Genomic DNA Translation: AEC08163.1
AY124835 mRNA Translation: AAM70544.1
AY057605 mRNA Translation: AAL14400.1
AF325075 mRNA Translation: AAK17143.1
AY085391 mRNA Translation: AAM62619.1
PIRiD84688
RefSeqiNP_180440.1, NM_128433.4

3D structure databases

AlphaFoldDBiQ9SI96
SMRiQ9SI96
ModBaseiSearch...

Protein-protein interaction databases

STRINGi3702.AT2G28720.1

PTM databases

iPTMnetiQ9SI96

Proteomic databases

PaxDbiQ9SI96
PRIDEiQ9SI96
ProteomicsDBi247157

Protocols and materials databases

The DNASU plasmid repository

More...
DNASUi
817421

Genome annotation databases

EnsemblPlantsiAT2G28720.1; AT2G28720.1; AT2G28720
GeneIDi817421
GrameneiAT2G28720.1; AT2G28720.1; AT2G28720
KEGGiath:AT2G28720

Organism-specific databases

AraportiAT2G28720
TAIRilocus:2054553, AT2G28720

Phylogenomic databases

eggNOGiKOG1744, Eukaryota
HOGENOMiCLU_075666_1_3_1
InParanoidiQ9SI96
OMAiDIFDRMA
OrthoDBi1536672at2759
PhylomeDBiQ9SI96

Miscellaneous databases

Protein Ontology

More...
PROi
PR:Q9SI96

Gene expression databases

ExpressionAtlasiQ9SI96, baseline and differential
GenevisibleiQ9SI96, AT

Family and domain databases

Gene3Di1.10.20.10, 1 hit
InterProiView protein in InterPro
IPR009072, Histone-fold
IPR007125, Histone_H2A/H2B/H3
IPR000558, Histone_H2B
PANTHERiPTHR23428, PTHR23428, 1 hit
PfamiView protein in Pfam
PF00125, Histone, 1 hit
PRINTSiPR00621, HISTONEH2B
SMARTiView protein in SMART
SM00427, H2B, 1 hit
SUPFAMiSSF47113, SSF47113, 1 hit
PROSITEiView protein in PROSITE
PS00357, HISTONE_H2B, 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 nameiH2B3_ARATH
<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: Q9SI96
<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: May 30, 2006
Last sequence update: January 23, 2007
Last modified: May 25, 2022
This is version 133 of the entry and version 3 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 programPlant 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. Arabidopsis thaliana
    Arabidopsis thaliana: entries and gene names
  2. SIMILARITY comments
    Index of protein domains and families
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