Related Experiment Video
Updated: Jun 29, 2025
09:51
Investigating Protein Sequence-structure-dynamics Relationships with Bio3D-web
Published on: July 16, 2017
15.4K
Exploring the structural assembly of rice ADP-glucose pyrophosphorylase subunits using MD simulation
Jitendra Maharana1, Seon-Kap Hwang2, Dhanawantari L Singha3
1Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat, Assam, 785013, India.
Journal of Molecular Graphics & Modelling
|March 29, 2024
Summary
ADP-glucose pyrophosphorylase (AGPase) is crucial for starch synthesis. This study reveals that rice plastidial AGPase subunits (OsL1:OsS1) assemble similarly to other plant AGPases, suggesting distinct regulatory roles compared to cytosolic forms.
Area of Science:
- Plant biochemistry
- Molecular biology
- Structural biology
Background:
- ADP-glucose pyrophosphorylase (AGPase) is a key enzyme in plant starch biosynthesis.
- Rice AGPase exists as heterotetramers composed of large and small subunits.
- While cytosolic rice AGPase structure is known, plastidial forms remain uncharacterized.
Purpose of the Study:
- To investigate the structural assembly of plastidial rice AGPase subunits (OsL1:OsS1).
- To compare the assembly of plastidial rice AGPase with known cytosolic and potato AGPase structures.
Main Methods:
- Protein modeling
- Molecular dynamics (MD) simulations
- Yeast-two-hybrid assays
Main Results:
- The heterotetrameric assembly of OsL1:OsS1 closely resembles that of cytosolic OsL2:OsS2b and potato AGPase (StLS:StSS).
- Yeast-two-hybrid results for OsL1:OsS1 mirror those for StLS:StSS, indicating potential differences in OsL2:OsS2b assembly.
- This suggests distinct regulatory and catalytic mechanisms for plastidial AGPases.
Conclusions:
- Plastidial rice AGPase (OsL1:OsS1) exhibits a conserved heterotetrameric assembly mechanism.
- Differential subunit assembly may lead to distinct functional roles for plastidial versus cytosolic AGPases in rice.
- Understanding these differences is crucial for comprehending starch biosynthesis regulation in rice culm and endosperm.
Related Concept Videos
02:18Fischer Projections
13.2K
Learning to draw Fischer projections of molecules and understanding their relevance plays a crucial role in the visual depiction of organic molecules. A Fischer projection is a two-dimensional projection on a planar surface to simplify the three-dimensional wedge–dash representation of molecules. This is especially helpful in the case of molecules with multiple chiral centers that can be difficult to draw. Here, all the bonds of interest are represented as horizontal or vertical lines.
13.2K
01:48ATP Synthase: Mechanism
14.6K
In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...
14.6K