期刊
NUCLEIC ACIDS RESEARCH
卷 48, 期 3, 页码 1531-1550出版社
OXFORD UNIV PRESS
DOI: 10.1093/nar/gkz1153
关键词
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资金
- Science and Engineering Research Board, Government of India [EMR/2014/000070, CRG/2018/000695/PS]
- Department of Biotechnology, Ministry of Science and Technology, Government of India [BT/PR10374/MED/29/820/2013, BT/INF/22/SP22660/2017]
- EMBL-India consortium
- Science and Engineering Research Board, Government of India
- Institute of Life Sciences, Bhubaneswar
FKBP53 is one of the seven multi-domain FK506-binding proteins present in Arabidopsis thaliana, and it is known to get targeted to the nucleus. It has a conserved PPIase domain at the C-terminus and a highly charged N-terminal stretch, which has been reported to bind to histone H3 and perform the function of a histone chaperone. To better understand the molecular details of this PPIase with histone chaperoning activity, we have solved the crystal structures of its terminal domains and functionally characterized them. The C-terminal domain showed strong PPIase activity, no role in histone chaperoning and revealed a monomeric five-beta palm-like fold that wrapped over a helix, typical of an FK506-binding domain. The N-terminal domain had a pentameric nucleoplasmin-fold; making this the first report of a plant nucleoplasmin structure. Further characterization revealed the N-terminal nucleoplasmin domain to interact with H2A/H2B and H3/H4 histone oligomers, individually, as well as simultaneously, suggesting two different binding sites for H2A/H2B and H3/H4. The pentameric domain assists nucleosome assembly and forms a discrete complex with pre-formed nucleosomes; wherein two pentamers bind to a nucleosome.
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