ID   H2B_SIPNU               Reviewed;         123 AA.
AC   P30757;
DT   01-JUL-1993, integrated into UniProtKB/Swiss-Prot.
DT   23-JAN-2007, sequence version 2.
DT   03-AUG-2022, entry version 90.
DE   RecName: Full=Histone H2B;
GN   Name=H2B;
OS   Sipunculus nudus (Marine worm).
OC   Eukaryota; Metazoa; Spiralia; Lophotrochozoa; Sipuncula; Sipunculidea;
OC   Golfingiida; Sipunculidae; Sipunculus.
OX   NCBI_TaxID=6446;
RN   [1]
RP   NUCLEOTIDE SEQUENCE, PROTEIN SEQUENCE OF 2-6 AND 19-123, AND METHYLATION AT
RP   PRO-2.
RC   TISSUE=Erythrocyte;
RX   PubMed=2040294; DOI=10.1111/j.1432-1033.1991.tb16012.x;
RA   Kmiecik D., Belaiche D., Sautiere P., Loucheux-Lefebvre M.-H.,
RA   Kerckaert J.-P.;
RT   "Complete sequence of Sipunculus nudus erythrocyte histone H2B and its
RT   gene. Identification of an N,N-dimethylproline residue at the amino-
RT   terminus.";
RL   Eur. J. Biochem. 198:275-283(1991).
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. Chromosome.
CC   -!- PTM: Monoubiquitination of Lys-118 gives a specific tag for epigenetic
CC       transcriptional activation and is also prerequisite for histone H3
CC       'Lys-4' and 'Lys-79' methylation. {ECO:0000250}.
CC   -!- PTM: GlcNAcylation at Ser-110 promotes monoubiquitination of Lys-118 It
CC       fluctuates in response to extracellular glucose, and associates with
CC       transcribed genes. {ECO:0000250}.
CC   -!- SIMILARITY: Belongs to the histone H2B family. {ECO:0000305}.
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DR   PIR; S16084; S16084.
DR   AlphaFoldDB; P30757; -.
DR   SMR; P30757; -.
DR   iPTMnet; P30757; -.
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:0044877; F:protein-containing complex binding; ISS:UniProtKB.
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   1: Evidence at protein level;
KW   Chromosome; Direct protein sequencing; DNA-binding; Glycoprotein;
KW   Isopeptide bond; Methylation; Nucleosome core; Nucleus; Ubl conjugation.
FT   INIT_MET        1
FT                   /note="Removed"
FT                   /evidence="ECO:0000269|PubMed:2040294"
FT   CHAIN           2..123
FT                   /note="Histone H2B"
FT                   /id="PRO_0000071873"
FT   REGION          1..32
FT                   /note="Disordered"
FT                   /evidence="ECO:0000256|SAM:MobiDB-lite"
FT   MOD_RES         2
FT                   /note="N,N-dimethylproline"
FT                   /evidence="ECO:0000269|PubMed:2040294"
FT   CARBOHYD        110
FT                   /note="O-linked (GlcNAc) serine"
FT                   /evidence="ECO:0000250"
FT   CROSSLNK        118
FT                   /note="Glycyl lysine isopeptide (Lys-Gly) (interchain with
FT                   G-Cter in ubiquitin)"
FT                   /evidence="ECO:0000250"
SQ   SEQUENCE   123 AA;  13664 MW;  A02E278AC302D0FC CRC64;
     MPPKPSAKGA KKAASKAKAA RTGDKKRRKR RKESYSIYIY KVLKQVHPDT GISSKAMSIM
     NSFVNDIFER IAAEASRLAH YNRRSTITSR EIQTAVRLLL PGELAKHAVS EGTKAVTKYT
     SSK