期刊
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
卷 60, 期 44, 页码 23863-23870出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202110545
关键词
calmodulin; Mycobacterium smegmatis porin A; nanopore-traps; protein allosterism; single-molecule studies
资金
- National Natural Science Foundation of China [31972917, 91753108, 21675083]
- Programs for high-level entrepreneurial and innovative talents introduction of Jiangsu Province
- Natural Science Foundation of Jiangsu Province [BK20200009]
- Excellent Research Program of Nanjing University [ZYJH004]
- State Key Laboratory of Analytical Chemistry for Life Science [5431ZZXM1902]
- Shanghai Municipal Science and Technology Major Project
Recent developments in large protein nanopores have allowed for the direct observation and distinction of different conformers of calmodulin, a Ca2+-binding protein. This study demonstrated how a disease-related mutant and different ions can affect the binding capacity and stability of calmodulin. The systematic single-molecule investigation showcased the high sensing resolution offered by the MspA nanopore trap.
Recent developments concerning large protein nanopores suggest a new approach to structure profiling of native folded proteins. In this work, the large vestibule of Mycobacterium smegmatis porin A (MspA) and calmodulin (CaM), a Ca2+-binding protein, were used in the direct observation of the protein structure. Three conformers, including the Ca2+-free, Ca2+-bound, and target peptide-bound states of CaM, were unambiguously distinguished. A disease related mutant, CaM D129G was also discriminated by MspA, revealing how a single amino acid replacement can interfere with the Ca2+-binding capacity of the whole protein. The binding capacity and aggregation effect of CaM induced by different ions (Mg2+/Sr2+/Ba2+/Ca2+/Pb2+/Tb3+) were also investigated and the stability of MspA in extreme conditions was evaluated. This work demonstrates the most systematic single-molecule investigation of different allosteric conformers of CaM, acknowledging the high sensing resolution offered by the MspA nanopore trap.
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