3B1K

Crystal structure of Glyceraldehyde-3-Phosphate Dehydrogenase complexed with CP12 in the absence of copper from Synechococcus elongatus

Summary for 3B1K

• Entry DOI: 10.2210/pdb3b1k/pdb
• Related: 3B1J
• Descriptor: Glyceraldehyde 3-phosphate dehydrogenase (NADP+), CP12, NICOTINAMIDE-ADENINE-DINUCLEOTIDE, ... (4 entities in total)
• Functional Keywords: alpha/beta fold, oxidoreductase-protein binding complex, oxidoreductase/protein binding
• Biological source: Synechococcus elongatus; More
• Total number of polymer chains: 8
• Total formula weight: 162105.65

Authors

Matsumura, H.,Kai, A.,Inoue, T. (deposition date: 2011-07-04, release date: 2012-01-11, Last modification date: 2023-11-01)

Primary citation

Matsumura, H.,Kai, A.,Maeda, T.,Tamoi, M.,Satoh, A.,Tamura, H.,Hirose, M.,Ogawa, T.,Kizu, N.,Wadano, A.,Inoue, T.,Shigeoka, S.
Structure Basis for the Regulation of Glyceraldehyde-3-Phosphate Dehydrogenase Activity via the Intrinsically Disordered Protein CP12.
Structure, 19:1846-1854, 2011

PubMed Abstract: The reversible formation of a glyceraldehyde-3-phosphate dehydrogenase (GAPDH)-CP12-phosphoribulokinase (PRK) supramolecular complex, identified in oxygenic photosynthetic organisms, provides light-dependent Calvin cycle regulation in a coordinated manner. An intrinsically disordered protein (IDP) CP12 acts as a linker to sequentially bind GAPDH and PRK to downregulate both enzymes. Here, we report the crystal structures of the ternary GAPDH-CP12-NAD and binary GAPDH-NAD complexes from Synechococcus elongates. The GAPDH-CP12 complex structure reveals that the oxidized CP12 becomes partially structured upon GAPDH binding. The C-terminus of CP12 is inserted into the active-site region of GAPDH, resulting in competitive inhibition of GAPDH. This study also provides insight into how the GAPDH-CP12 complex is dissociated by a high NADP(H)/NAD(H) ratio. An unexpected increase in negative charge potential that emerged upon CP12 binding highlights the biological function of CP12 in the sequential assembly of the supramolecular complex.

PubMed: 22153507
DOI: 10.1016/j.str.2011.08.016

Experimental method

X-RAY DIFFRACTION (3.302 Å)