Title
Insight into the oligomeric structure of PORA from A. thaliana
Author
Michal Gabruk, Zuzanna Nowakowska, Bozena Skupien-Rabian, Sylwia Kędracka-Krok, Beata Mysliwa-Kurdziel, Jerzy Kruk
Year
2016
Journal
Biochimica et Biophysica Acta (BBA) - Proteins and Proteomics
Abstract
Light-dependent protochlorophyllide oxidoreductase (POR, E.C. 1.3.1.33) is a plant enzyme that directly needs light to conduct a biochemical reaction. In the present paper we confirmed that POR forms large oligomers in solution before binding of substrates. We carried out the research using different techniques: cross-linking, native gel electrophoresis and FRET measurements. Mass spectrometry analysis of the cross-link products provided the first structural data about the organisation of the oligomer of POR. The results indicated that the catalytic motifs of the adjacent subunits become close to each other upon binding of substrates. Moreover, we identified two mutations of POR that disturbed its oligomerisation properties: Δ85–88 and Δ240–270. Additionally, a complete loss of the catalytic activity was observed for the following mutations: Δ189–194, Δ240–270, Δ318–331 and Δ392–393.
Instrument
J-710
Keywords
Circular dichroism, Secondary structure, Biochemistry