ID H2B_MARGL Reviewed; 121 AA. AC P02285; DT 21-JUL-1986, integrated into UniProtKB/Swiss-Prot. DT 23-JAN-2007, sequence version 2. DT 22-JUL-2008, entry version 53. DE RecName: Full=Histone H2B, sperm; OS Marthasterias glacialis (Spiny starfish). OC Eukaryota; Metazoa; Echinodermata; Eleutherozoa; Asterozoa; OC Asteroidea; Forcipulatacea; Forcipulatida; Asteriidae; Marthasterias. OX NCBI_TaxID=7609; RN [1] RP PROTEIN SEQUENCE OF 2-121. RX MEDLINE=80245951; PubMed=7398625; RA Strickland M., Strickland W.N., von Holt C.; RT "The histone H2B from the sperm cell of the starfish Marthasterias RT glacialis."; RL Eur. J. Biochem. 106:541-548(1980). CC -!- FUNCTION: Core component of nucleosome. Nucleosomes wrap and CC compact DNA into chromatin, limiting DNA accessibility to the CC cellular machineries which require DNA as a template. Histones CC thereby play a central role in transcription regulation, DNA CC repair, DNA replication and chromosomal stability. DNA CC accessibility is regulated via a complex set of post-translational CC modifications of histones, also called histone code, and CC nucleosome remodeling. CC -!- SUBUNIT: The nucleosome is a histone octamer containing two CC molecules each of H2A, H2B, H3 and H4 assembled in one H3-H4 CC heterotetramer and two H2A-H2B heterodimers. The octamer wraps CC approximately 147 bp of DNA. CC -!- SUBCELLULAR LOCATION: Nucleus. CC -!- PTM: Monoubiquitination of Lys-116 gives a specific tag for CC epigenetic transcriptional activation and is also prerequisite for CC histone H3 'Lys-4' and 'Lys-79' methylation (By similarity). CC -!- SIMILARITY: Belongs to the histone H2B family. CC --------------------------------------------------------------------------- CC Copyrighted by the UniProt Consortium, see https://www.uniprot.org/terms CC Distributed under the Creative Commons Attribution (CC BY 4.0) License CC --------------------------------------------------------------------------- DR PIR; A02612; HSSF2M. DR HSSP; P02281; 1KX3. DR SMR; P02285; 23-121. DR InterPro; IPR009072; Histone-fold. DR InterPro; IPR007125; Histone_core_D. DR InterPro; IPR000558; Histone_H2B. DR Gene3D; G3DSA:1.10.20.10; Histone-fold; 1. DR PANTHER; PTHR23428; Histone_H2B; 1. DR Pfam; PF00125; Histone; 1. DR PRINTS; PR00621; HISTONEH2B. DR ProDom; PD000497; Histone_H2B; 1. DR SMART; SM00427; H2B; 1. DR PROSITE; PS00357; HISTONE_H2B; 1. PE 1: Evidence at protein level; KW Chromosomal protein; Direct protein sequencing; DNA-binding; KW Methylation; Nucleosome core; Nucleus; Ubl conjugation. FT INIT_MET 1 1 Removed. FT CHAIN 2 121 Histone H2B, sperm. FT /FTId=PRO_0000071887. FT MOD_RES 2 2 N,N-dimethylproline (Probable). FT CROSSLNK 116 116 Glycyl lysine isopeptide (Lys-Gly) FT (interchain with G-Cter in ubiquitin) (By FT similarity). SQ SEQUENCE 121 AA; 13481 MW; C7B97F69B7911824 CRC64; MPPKSGKGQK KAGKAKGAPR SDKKRRRKRK ESYGIYIYKV MKQVHPDTGI SSRAMSIMNS FVNDIFERIA AEASRLAHYN KKSTITSREV QTAVRLLLPG ELAKHAVSEG TKAVTKYTTS K //