Structural highlights
Function[ARI4A_HUMAN] Interacts with the viral protein-binding domain of the retinoblastoma protein. Publication Abstract from PubMedRetinoblastoma-binding protein 1 (RBBP1) is involved in gene regulation, epigenetic regulation, and disease processes. RBBP1 contains five domains with DNA-binding or histone-binding activities, but how RBBP1 specifically recognizes chromatin is still unknown. An AT-rich interaction domain (ARID) in RBBP1 was proposed to be the key region for DNA-binding and gene suppression. Here, we first determined the solution structure of a tandem PWWP-ARID domain mutant of RBBP1 after deletion of a long flexible acidic loop L12 in the ARID domain. NMR titration results indicated that the ARID domain interacts with DNA with no GC- or AT-rich preference. Surprisingly, we found that the loop L12 binds to the DNA-binding region of the ARID domain as a DNA mimic and inhibits DNA binding. The loop L12 can also bind weakly to the Tudor and chromobarrel domains of RBBP1, but binds more strongly to the DNA-binding region of the histone H2A-H2B heterodimer. Furthermore, both the loop L12 and DNA can enhance the binding of the chromobarrel domain to H3K4me3 and H4K20me3. Based on these results, we propose a model of chromatin recognition by RBBP1, which highlights the unexpected multiple key roles of the disordered acidic loop L12 in the specific binding of RBBP1 to chromatin. Structural Insight into Chromatin Recognition by Multiple Domains of the Tumor Suppressor RBBP1.,Gong W, Liang Q, Tong Y, Perrett S, Feng Y J Mol Biol. 2021 Sep 8;433(21):167224. doi: 10.1016/j.jmb.2021.167224. PMID:34506790[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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