ID   H2B3_MEDTR              Reviewed;         138 AA.
AC   Q1SU99;
DT   13-JUN-2006, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 3.
DT   03-AUG-2022, entry version 69.
DE   RecName: Full=Probable histone H2B.3;
OS   Medicago truncatula (Barrel medic) (Medicago tribuloides).
OC   Eukaryota; Viridiplantae; Streptophyta; Embryophyta; Tracheophyta;
OC   Spermatophyta; Magnoliopsida; eudicotyledons; Gunneridae; Pentapetalae;
OC   rosids; fabids; Fabales; Fabaceae; Papilionoideae; 50 kb inversion clade;
OC   NPAAA clade; Hologalegina; IRL clade; Trifolieae; Medicago.
OX   NCBI_TaxID=3880;
RN   [1]
RP   NUCLEOTIDE SEQUENCE [LARGE SCALE GENOMIC DNA].
RG   The international Medicago genome annotation group;
RL   Submitted (APR-2006) to the EMBL/GenBank/DDBJ databases.
CC   -!- FUNCTION: Core component of nucleosome. Nucleosomes wrap and compact
CC       DNA into chromatin, limiting DNA accessibility to the cellular
CC       machineries which require DNA as a template. Histones thereby play a
CC       central role in transcription regulation, DNA repair, DNA replication
CC       and chromosomal stability. DNA accessibility is regulated via a complex
CC       set of post-translational modifications of histones, also called
CC       histone code, and nucleosome remodeling.
CC   -!- SUBUNIT: The nucleosome is a histone octamer containing two molecules
CC       each of H2A, H2B, H3 and H4 assembled in one H3-H4 heterotetramer and
CC       two H2A-H2B heterodimers. The octamer wraps approximately 147 bp of
CC       DNA.
CC   -!- SUBCELLULAR LOCATION: Nucleus {ECO:0000250}. Chromosome {ECO:0000250}.
CC   -!- PTM: Can be acetylated to form H2BK6ac, H2BK33ac and H2BK34ac.
CC       {ECO:0000250}.
CC   -!- PTM: Monoubiquitinated to form H2BK143ub1; may give a specific tag for
CC       epigenetic transcriptional activation. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the histone H2B family. {ECO:0000305}.
CC   -!- CAUTION: To ensure consistency between histone entries, we follow the
CC       'Brno' nomenclature for histone modifications, with positions referring
CC       to those used in the literature for the 'closest' model organism. Due
CC       to slight variations in histone sequences between organisms and to the
CC       presence of initiator methionine in UniProtKB/Swiss-Prot sequences, the
CC       actual positions of modified amino acids in the sequence generally
CC       differ. In this entry the following conventions are used: H2BK6ac =
CC       acetylated Lys-8; H2BK33ac = acetylated Lys-29; H2BK34ac = acetylated
CC       Lys-30; H2BK143ub1 = monoubiquitinated Lys-134. {ECO:0000305}.
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DR   EMBL; AC135797; -; NOT_ANNOTATED_CDS; Genomic_DNA.
DR   EMBL; AC125368; -; NOT_ANNOTATED_CDS; Genomic_DNA.
DR   RefSeq; XP_003625510.1; XM_003625462.2.
DR   AlphaFoldDB; Q1SU99; -.
DR   SMR; Q1SU99; -.
DR   STRING; 3880.AES81728; -.
DR   PRIDE; Q1SU99; -.
DR   EnsemblPlants; AES81728; AES81728; MTR_7g099960.
DR   GeneID; 11432921; -.
DR   Gramene; AES81728; AES81728; MTR_7g099960.
DR   eggNOG; KOG1744; Eukaryota.
DR   HOGENOM; CLU_075666_1_0_1; -.
DR   OMA; WSEAMSI; -.
DR   OrthoDB; 1536672at2759; -.
DR   ExpressionAtlas; Q1SU99; differential.
DR   GO; GO:0000786; C:nucleosome; IEA:UniProtKB-KW.
DR   GO; GO:0005634; C:nucleus; IEA:UniProtKB-SubCell.
DR   GO; GO:0003677; F:DNA binding; IEA:UniProtKB-KW.
DR   GO; GO:0046982; F:protein heterodimerization activity; IEA:InterPro.
DR   GO; GO:0030527; F:structural constituent of chromatin; IEA:InterPro.
DR   Gene3D; 1.10.20.10; -; 1.
DR   InterPro; IPR009072; Histone-fold.
DR   InterPro; IPR007125; Histone_H2A/H2B/H3.
DR   InterPro; IPR000558; Histone_H2B.
DR   PANTHER; PTHR23428; PTHR23428; 1.
DR   Pfam; PF00125; Histone; 1.
DR   PRINTS; PR00621; HISTONEH2B.
DR   SMART; SM00427; H2B; 1.
DR   SUPFAM; SSF47113; SSF47113; 1.
DR   PROSITE; PS00357; HISTONE_H2B; 1.
PE   3: Inferred from homology;
KW   Acetylation; Chromosome; DNA-binding; Isopeptide bond; Nucleosome core;
KW   Nucleus; Ubl conjugation.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000250"
FT   CHAIN           2..138
FT                   /note="Probable histone H2B.3"
FT                   /id="PRO_0000240002"
FT   REGION          1..46
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   MOD_RES         8
FT                   /note="N6-acetyllysine"
FT                   /evidence="ECO:0000250"
FT   MOD_RES         29
FT                   /note="N6-acetyllysine"
FT                   /evidence="ECO:0000250"
FT   MOD_RES         30
FT                   /note="N6-acetyllysine"
FT                   /evidence="ECO:0000250"
FT   CROSSLNK        134
FT                   /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT                   G-Cter in ubiquitin)"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   138 AA;  15371 MW;  5342D3AD9962F67F CRC64;
     MPPTKAEKKP AEKKPAEKAP AEKKPKAEKK ISKEGSSDKK KKRTKKSVET YKIYIFKVLK
     QVHPDIGVSS KAMGIMNSFI NDIFEKLAQE SSRLARYNKK PTITSREIQT AVRLVLPGEL
     AKHAVSEGTK AVTKFTSS