FRET analysis of CP12 structural interplay by GAPDH and PRK

Satish Babu Moparthi (1, 2) , Gabriel Thieulin Pardo (3) , Juan de Torres (1, 2) , Petru Ghenuche (1, 2) , Brigitte Gontero (3) , Jérôme Wenger (1, 2)

1 AMU - Aix Marseille Université
2 MOSAIC - MOSAIC
3 BIP - Bioénergétique et Ingénierie des Protéines

CP12 is an intrinsically disordered protein playing a key role in the regulation of the Benson–Calvin cycle. Due to the high intrinsic flexibility of CP12, it is essential to consider its structural modulation induced upon binding to the glyceraldehyde-3-phosphate dehydrogenase (GAPDH) and phosphoribulokinase (PRK) enzymes. Here, we report for the first time detailed structural modulation about the wild-type CP12 and its site-specific N-terminal and C-terminal disulfide bridge mutants upon interaction with GAPDH and PRK by Förster resonance energy transfer (FRET). Our results indicate an increase in CP12 compactness when the complex is formed with GAPDH or PRK. In addition, the distributions in FRET histograms show the elasticity and conformational flexibility of CP12 in all supra molecular complexes. Contrarily to previous beliefs, our FRET results importantly reveal that both N-terminal and C-terminal site-specific CP12 mutants are able to form the monomeric (GAPDH-CP12-PRK) complex.

Mots clés: Intrinsic disorder proteins; CP12; GAPDH; PRK; Single molecule FRET; Conformational modulation

Domaines: Sciences du Vivant [q-bio]

Satish Babu Moparthi, Gabriel Thieulin Pardo, Juan de Torres, Petru Ghenuche, Brigitte Gontero, et al.. FRET analysis of CP12 structural interplay by GAPDH and PRK. Biochemical and Biophysical Research Communications, 2015, 458 issue 3, pp.488-493. ⟨10.1016/j.bbrc.2015.01.135⟩. ⟨hal-01429065⟩