Histone H2B type 1-K (H2BC12 (occasionally H2B1K))

Histone H2B type 1-K is a basic nuclear protein encoded by the H2BC12 (often synonymized as HIST1H2BK) gene and is a core component of the nucleosome, the fundamental unit of chromatin structure in eukaryotic cells[2][4]. It participates in packaging DNA into nucleosomes, thus regulating DNA accessibility for transcription, replication, and repair[1][2][4]. Two copies each of H2A, H2B (including its variants like H2B1K), H3, and H4 assemble into an octamer around which DNA wraps, forming nucleosomes[1][2][6]. Post-translational modifications of histone H2B, such as acetylation, ubiquitination, methylation, and phosphorylation, play important regulatory roles in gene expression and DNA repair[1][3]. H2BC12-encoded histone H2B has also been identified as an antimicrobial protein with antibacterial and antifungal activities, contributing to mucosal barrier function[2][6]. Variants of histone H2B, such as those encoded by H2BC12L, are not considered receptors, enzymes, or classical drug targets, and no small molecule interactions or therapeutically actionable mechanisms have been described to date[2]. Disruptions or mutations in histone genes are associated with chromatin structural defects and can play roles in diseases such as cancer and certain developmental syndromes[2]. Note: "H2B clustered histone 12 like" (H2BC12L) appears to be a less standardized, possibly ambiguous designation, and the mainstream, scientifically established gene/protein for this function is "Histone H2B type 1-K" (encoded by H2BC12/ HIST1H2BK)[2][4][6]. No evidence supports "H2BC12L" as either a separate functional gene or as a therapeutic target.

Other names

H2BC12LH2B clustered histone 12 likeH2BFSH2BS1H2B/sH2B.S histone 1Histone H2B.shistone H2B type F-SH2B histone family member SHIST1H2BKH2BFTH2B1K