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- Title
Cu2+ triggers reversible aggregation of a disordered His-rich dehydrin MpDhn12 from Musa paradisiaca.
- Authors
Mu, Peiqiang; Feng, Dongru; Su, Jianbin; Zhang, Yang; Dai, Jinran; Jin, Honglei; Liu, Bing; He, Yanming; Qi, Kangbiao; Wang, Hongbin; Wang, Jinfa
- Abstract
Copper is an essential nutrient, but it is toxic in excess. Here, we cloned and characterized a His-rich low molecular weight dehydrin from Musa paradisiaca, MpDhn12. Analysis by circular dichroism (CD) spectra and a thermal stability assay showed that MpDhn12 is an intrinsically disordered protein, and immobilized-metal affinity chromatography (IMAC) analysis revealed that MpDhn12 can bind Cu2+ both in vitro and in vivo. Interestingly, MpDhn12 aggregated under excess Cu2+ conditions, and the aggregation was reversible and impaired by histidine modification with diethylpyrocarbonate (DEPC), while the disordered structure of another dehydrin ERD14 (as a control) was not changed. Furthermore, MpDhn12 could complement the copper-sensitive phenotype of yeast mutant Δsod1. These results together suggested that MpDhn12 may take part in buffering copper levels through chelation and formation of aggregates in excess Cu2+ conditions. To the best of our knowledge, it is the first report that a dehydrin interchanged between disordered and aggregated state triggered by copper.
- Subjects
CLUSTERING of particles; COPPER; MOLECULAR weights; PLANTAIN banana; CIRCULAR dichroism; HISTIDINE
- Publication
Journal of Biochemistry, 2011, Vol 150, Issue 5, p491
- ISSN
0021-924X
- Publication type
Article
- DOI
10.1093/jb/mvr082