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Entry version 57 (08 May 2019)
Sequence version 2 (23 Jan 2007)
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Protein

Histone H3.3

Gene
N/A
Organism
Medicago sativa (Alfalfa)
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

Variant histone H3 which replaces conventional H3 in a wide range of nucleosomes in active genes. Constitutes the predominant form of histone H3 in non-dividing cells and is incorporated into chromatin independently of DNA synthesis. Deposited at sites of nucleosomal displacement throughout transcribed genes, suggesting that it represents an epigenetic imprint of transcriptionally active chromatin. 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: H3K4me1/2/3 = mono-, di- and trimethylated Lys-5; H3K9ac = acetylated Lys-10; H3K9me1/2/3 = mono-, di- and trimethylated Lys-10; H3S10ph = phosphorylated Ser-11; H3T11ph = phosphorylated Thr-12; H3K14ac = acetylated Lys-15; H3K14me3 = trimethylated Lys-15; H3K18ac = acetylated Lys-19; H3K18me3 = trimethylated Lys-19; H3K23ac = acetylated Lys-24; H3K23me3 = trimethylated Lys-24; H3K27me1/2/3 = mono-, di- and trimethylated Lys-28; H3S28ph = phosphorylated Ser-29; H3K36 = Lys-37; H3K37 = Lys-38.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

<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_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:
Histone H3.3
Alternative name(s):
Histone H3.2
Minor histone H3
<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>OrganismiMedicago sativa (Alfalfa)
<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 identifieri3879 [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 lineageiEukaryotaViridiplantaeStreptophytaEmbryophytaTracheophytaSpermatophytaMagnoliophytaeudicotyledonsGunneridaePentapetalaerosidsfabidsFabalesFabaceaePapilionoideae50 kb inversion cladeNPAAA cladeHologaleginaIRL cladeTrifolieaeMedicago

<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

Extracellular region or secreted Cytosol Plasma membrane Cell wall Cytoskeleton Vacuole Chloroplast Endosome Peroxisome ER Golgi apparatus Nucleus Mitochondrion Manual annotation Automatic computational assertion Graphics by Christian Stolte & Seán O’Donoghue; Source: COMPARTMENTS

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_processing_section">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 methionineiRemoved1 Publication
<p>This subsection of the ‘PTM / Processing’ section describes the extent of a polypeptide chain in the mature protein following processing.<p><a href='/help/chain' target='_top'>More...</a></p>ChainiPRO_00002212852 – 136Histone H3.3Add BLAST135

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 residuei5N6,N6,N6-trimethyllysine; alternate1 Publication1
Modified residuei5N6,N6-dimethyllysine; alternate1 Publication1
Modified residuei5N6-methyllysine; alternate1 Publication1
Modified residuei10N6,N6,N6-trimethyllysine; alternate1 Publication1
Modified residuei10N6,N6-dimethyllysine; alternate1 Publication1
Modified residuei10N6-acetyllysine; alternate1 Publication1
Modified residuei10N6-methyllysine; alternate1 Publication1
Modified residuei11PhosphoserineBy similarity1
Modified residuei12PhosphothreonineBy similarity1
Modified residuei15N6,N6,N6-trimethyllysine; alternate1 Publication1
Modified residuei15N6-acetyllysine; alternate1 Publication1
Modified residuei19N6,N6,N6-trimethyllysine; alternate1 Publication1
Modified residuei19N6-acetyllysine; alternate1 Publication1
Modified residuei24N6,N6,N6-trimethyllysine; alternate1 Publication1
Modified residuei24N6-acetyllysine; alternate1 Publication1
Modified residuei28N6,N6,N6-trimethyllysine; alternate1 Publication1
Modified residuei28N6,N6-dimethyllysine; alternate1 Publication1
Modified residuei28N6-acetyllysine; alternate1 Publication1
Modified residuei28N6-methyllysine; alternate1 Publication1
Modified residuei29PhosphoserineBy similarity1

<p>This subsection of the <a href="http://www.uniprot.org/help/ptm_processing_section">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

Acetylation is generally linked to gene activation. Acetylated to form H3K9ac (2%), H3K14 (37%), H3K18 (25%) and H3K23 (9%). Pre-existing H3K9me or H3K27me limit the possibility for histone acetylation. H3.2 shows a much higher level of steady-state acetylation than H3.1. Increased multiacetylation after exposure to NaCl.
24% of H3K4 is found under the form of H3K4me1, 6% of H3K4me2 and 19% of H3K4me3. When not under the form of H3K9ac, H3K9 is found as H3K9me1 (43%), H3K9me2 (9%) or H3K9me3 (15%). When not acetylated, H3K14, H3K18 and H3K23 are only under the form of H3K14me3 (18%), H3K18me3 (16%), and H3K23me3 (33%). 31% of H3K27 is found under the form of H3K27me1, 24% of H3K27me2 and 38% of H3K27me3.1 Publication
Can be phosphorylated to form H3S10ph, H3T11ph and H3S28ph (By similarity). No phosphorylation detected during salt stress.By similarity
No modifications detected on H3K36 and H3K37.

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>Sitei37Not N6-acetylated1 Publication1
Sitei37Not N6-methylated1 Publication1
Sitei38Not N6-acetylated1 Publication1
Sitei38Not N6-methylated1 Publication1

Keywords - PTMi

Acetylation, Methylation, Phosphoprotein

Proteomic databases

PRoteomics IDEntifications database

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PRIDEi
P69244

PTM databases

iPTMnet integrated resource for PTMs in systems biology context

More...
iPTMneti
P69244

<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

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

<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

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SMRi
P69244

Database of comparative protein structure models

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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

<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 H3 family.Curated

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
IPR000164 Histone_H3/CENP-A

The PANTHER Classification System

More...
PANTHERi
PTHR11426 PTHR11426, 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

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PRINTSi
PR00622 HISTONEH3

Simple Modular Architecture Research Tool; a protein domain database

More...
SMARTi
View protein in SMART
SM00428 H3, 1 hit

Superfamily database of structural and functional annotation

More...
SUPFAMi
SSF47113 SSF47113, 1 hit

PROSITE; a protein domain and family database

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PROSITEi
View protein in PROSITE
PS00322 HISTONE_H3_1, 1 hit
PS00959 HISTONE_H3_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>Sequencei

<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.

<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 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.

P69244-1 [UniParc]FASTAAdd to basket
« Hide
        10         20         30         40         50
MARTKQTARK STGGKAPRKQ LATKAARKSA PTTGGVKKPH RYRPGTVALR
60 70 80 90 100
EIRKYQKSTE LLIRKLPFQR LVREIAQDFK TDLRFQSHAV LALQEAAEAY
110 120 130
LVGLFEDTNL CAIHAKRVTI MPKDIQLARR IRGERA
Length:136
Mass (Da):15,406
Last modified:January 23, 2007 - 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:i6D72383BF2E9EBE6
GO

Sequence databases

Select the link destinations:

EMBL nucleotide sequence database

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EMBLi

GenBank nucleotide sequence database

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GenBanki

DNA Data Bank of Japan; a nucleotide sequence database

More...
DDBJi
Links Updated
U09458 Unassigned DNA Translation: AAB49538.1
U09460 mRNA Translation: AAB36493.1
U09461 mRNA Translation: AAB36494.1
U09464 mRNA Translation: AAB36497.1
U09465 mRNA Translation: AAB36498.1
X13676 mRNA Translation: CAA31967.1

Protein sequence database of the Protein Information Resource

More...
PIRi
B38309
S04521

<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
U09458 Unassigned DNA Translation: AAB49538.1
U09460 mRNA Translation: AAB36493.1
U09461 mRNA Translation: AAB36494.1
U09464 mRNA Translation: AAB36497.1
U09465 mRNA Translation: AAB36498.1
X13676 mRNA Translation: CAA31967.1
PIRiB38309
S04521

3D structure databases

SMRiP69244
ModBaseiSearch...

PTM databases

iPTMnetiP69244

Proteomic databases

PRIDEiP69244

Protocols and materials databases

Structural Biology KnowledgebaseSearch...

Family and domain databases

Gene3Di1.10.20.10, 1 hit
InterProiView protein in InterPro
IPR009072 Histone-fold
IPR007125 Histone_H2A/H2B/H3
IPR000164 Histone_H3/CENP-A
PANTHERiPTHR11426 PTHR11426, 1 hit
PfamiView protein in Pfam
PF00125 Histone, 1 hit
PRINTSiPR00622 HISTONEH3
SMARTiView protein in SMART
SM00428 H3, 1 hit
SUPFAMiSSF47113 SSF47113, 1 hit
PROSITEiView protein in PROSITE
PS00322 HISTONE_H3_1, 1 hit
PS00959 HISTONE_H3_2, 1 hit

ProtoNet; Automatic hierarchical classification of proteins

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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 nameiH33_MEDSA
<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: P69244
Secondary accession number(s): P11105
<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: February 15, 2005
Last sequence update: January 23, 2007
Last modified: May 8, 2019
This is version 57 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 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

Direct protein sequencing

Documents

  1. SIMILARITY comments
    Index of protein domains and families
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