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Crystal structure of human p32, a doughnut-shaped acidic mitochondrial matrix protein
J Jiang1, Y Zhang, A R Krainer
1W. M. Keck Structural Biology Laboratory, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.
Abstract:
Human p32 (also known as SF2-associated p32, p32/TAP, and gC1qR) is a conserved eukaryotic protein that localizes predominantly in the mitochondrial matrix. It is thought to be involved in mitochondrial oxidative phosphorylation and in nucleus-mitochondrion interactions. We report the crystal structure of p32 determined at 2.25 A resolution. The structure reveals that p32 adopts a novel fold with seven consecutive antiparallel beta-strands flanked by one N-terminal and two C-terminal alpha-helices. Three monomers form a doughnut-shaped quaternary structure with an unusually asymmetric charge distribution on the surface. The implications of the structure on previously proposed functions of p32 are discussed and new specific functional properties are suggested.
Insights
The crystal structure of human p32 protein reveals a novel fold and a doughnut-shaped quaternary structure. This finding offers new insights into its mitochondrial functions and interactions.
Area of Science:
- Structural biology
- Mitochondrial protein research
- Biochemistry
Background:
- Human p32 protein (also known as SF2-associated p32, p32/TAP, and gC1qR) is a conserved eukaryotic protein.
- It is primarily localized in the mitochondrial matrix.
- p32 is implicated in mitochondrial oxidative phosphorylation and nucleus-mitochondrion interactions.
Purpose of the Study:
- To determine the crystal structure of human p32.
- To elucidate the structural basis for p32's proposed functions.
- To suggest new functional properties based on its structure.
Main Methods:
- X-ray crystallography was employed to determine the crystal structure of human p32.
- The structure was resolved at a resolution of 2.25 Å.
Main Results:
- The crystal structure of p32 reveals a novel protein fold.
- The fold consists of seven consecutive antiparallel beta-strands, flanked by N-terminal and C-terminal alpha-helices.
- Three p32 monomers assemble into a doughnut-shaped quaternary structure with an asymmetric surface charge distribution.
Conclusions:
- The determined structure provides a novel structural framework for understanding p32.
- The findings offer implications for previously proposed functions of p32.
- New specific functional properties of p32 are suggested based on its unique structure.