histone H2B type 1-J; H2B.r; H2B/r; H2B.1 (HIST1H2BJ, H2BFR)

Function

• core component of nucleosome
• has broad antibacterial activity
• may contribute to the formation of the functional antimicrobial barrier of the colonic epithelium, & to the bactericidal activity of amniotic fluid
• monoubiquitination of Lys-121 by the RNF20/40 complex gives a specific tag for epigenetic transcriptional activation & is also prerequisite for histone H3 Lys-4 & Lys-7' methylation
• functions cooperatively with the FACT dimer to stimulate elongation by RNA polymerase 2
• phosphorylated on Ser-15 by STK4/MST1 during apoptosis; which facilitates apoptotic chromatin condensation
• phosphorylated on Ser-15 in response to DNA double-strand breaks, & in correlation with somatic hypermutation & immunoglobulin class-switch recombination

Structure

belongs to the histone H2B family

Compartment

nucleus

More general terms

• histone-H2B

Database

• UniProt: http://www.uniprot.org/uniprot/P06899.html
• Entrez gene: http://www.ncbi.nlm.nih.gov/sites/entrez?db=gene&cmd=Retrieve&dopt=Graphics&list_uids=8970
• Kegg: http://www.genome.jp/dbget-bin/www_bget?hsa:8970