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Title: Single-molecule diffusometry reveals the nucleotide-dependent oligomerization pathways of Nicotiana tabacum Rubisco activase

Journal Article · · Journal of Chemical Physics
DOI: https://doi.org/10.1063/1.5005930 · OSTI ID:1512950
 [1];  [2];  [2]; ORCiD logo [3]
  1. Stanford Univ., CA (United States). Dept. of Chemistry; none
  2. Arizona State Univ., Tempe, AZ (United States)
  3. Stanford Univ., CA (United States). Dept. of Chemistry

Oligomerization plays an important role in the function of many proteins, but a quantitative picture of the oligomer distribution has been difficult to obtain using existing techniques. Here in this paper, we describe a method that combines sub-stoichiometric labeling and recently developed single-molecule diffusometry to measure the size distribution of oligomers under equilibrium conditions in solution, one molecule at a time. We use this technique to characterize the oligomerization behavior of Nicotiana tabacum (Nt) Rubisco activase (Nt-Rca), a chaperone-like AAA-plus ATPase essential in regulating carbon fixation during photosynthesis. We directly observed monomers, dimers, and a tetramer/hexamer mixture and extracted their fractional abundance as a function of protein concentration. We show that the oligomerization pathway of Nt-Rca is nucleotide dependent: ATPγS binding strongly promotes tetramer/hexamer formation from dimers and results in a preferred tetramer/hexamer population for concentrations in the 1-10 $$μ$$M range. Furthermore, we directly observed dynamic assembly and disassembly processes of single complexes in real time and from there estimated the rate of subunit exchange to be ∼0.1 s-1 with ATPγS. On the other hand, ADP binding destabilizes Rca complexes by enhancing the rate of subunit exchange by >2 fold. These observations provide a quantitative starting point to elucidate the structure-function relations of Nt-Rca complexes. We envision the method to fill a critical gap in defining and quantifying protein assembly pathways in the small-oligomer regime.

Research Organization:
Arizona State Univ., Tempe, AZ (United States); Stanford Univ., CA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
FG02-07ER15892; SC0002423
OSTI ID:
1512950
Journal Information:
Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 12 Vol. 148; ISSN 0021-9606
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (9)

Single-molecule trapping and spectroscopy reveals photophysical heterogeneity of phycobilisomes quenched by Orange Carotenoid Protein journal March 2019
Single-molecule trapping and spectroscopy reveals photophysical heterogeneity of phycobilisomes quenched by Orange Carotenoid Protein journal March 2019
Rubisco activation by wheat Rubisco activase isoform 2β is insensitive to inhibition by ADP journal September 2019
Preface: Special Topic on Single-Molecule Biophysics journal March 2018
Probing the rice Rubisco–Rubisco activase interaction via subunit heterooligomerization journal November 2019
Assembly–disassembly is coupled to the ATPase cycle of tobacco Rubisco activase journal October 2018
A single point mutation in the C-terminal extension of wheat Rubisco activase dramatically reduces ADP inhibition via enhanced ATP binding affinity journal September 2019
Cyanobacterial carboxysomes contain an unique rubisco‐activase‐like protein journal October 2019
Preface: Special Topic on Single-Molecule Biophysics text January 2018

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