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Related Concept Videos

Assembly of Cytoskeletal Filaments01:18

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Cytoskeletal filaments are polymeric forms of smaller protein subunits. However, individual cytoskeletal filaments may easily disassemble or associate with other similar filaments to form rigid structures. Microfilaments, made of actin monomers, rely on actin-binding proteins to form bundles and create networks of individual actin filaments. Microtubules rely on microtubule-associated proteins (MAPs) to form sturdy cylindrical structures. However, the proteins involved in forming complex...
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The cytoskeletal architecture can be studied using different microscopic and biochemical techniques. Electron microscopy was instrumental in discovering the cytoskeletal architecture around the 1960s, which allowed obtaining structural information at a high-resolution level. However, the sample preparation procedure often limits this ability in biological samples. Several protocols have been developed over the years to optimize sample preparation. In one of the protocols known as rotary...
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The straight or branched structure formation of actin filaments is controlled by nucleating proteins such as the formins and Arp2/3 complex. Formin-mediated assembly results in straight filaments, whereas Arp2/3 protein complex-mediated assembly results in branched actin filaments.
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Fractal-like Self-Assembly in Citrate Synthase: Delineating Growth Patterns with Coarse-Grained Simulations.

Manasvini Subramanian1, Neelanjana Sengupta1

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This study reveals fractal-like self-assembly in citrate synthase, uncovering principles of protein architecture. It quantifies deviations from ideal fractality and identifies factors limiting higher-order biomolecular fractal growth.

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Area of Science:

  • Biomolecular self-assembly
  • Protein structural dynamics
  • Fractal geometry in biology

Background:

  • Natural fractals are well-documented, but biomolecular fractal growth is less understood.
  • Biomolecular fractals often exhibit limited range and imperfections due to physical constraints.

Purpose of the Study:

  • To investigate the Sierpinski fractal-like self-assembly of citrate synthase.
  • To elucidate the geometric, energetic, and dynamic principles governing hierarchical protein assembly.
  • To quantify deviations from ideal fractality and identify limiting factors in biomolecular fractal growth.

Main Methods:

  • Atomistic remodeling of the citrate synthase dimer.
  • Coarse-grained molecular dynamics simulations.
  • Custom algorithm for analyzing fractal void regions.
  • Power law exponent analysis for scaling behavior.

Main Results:

  • Quantified deviations from ideal fractality and fluctuations at increasing fractal levels.
  • Characterized the void structure of the Sierpinski fractal architecture in citrate synthase.
  • Uncovered power law exponents for structural and thermodynamic signatures of growth.
  • Identified factors limiting higher-order fractal growth in biomolecular systems.

Conclusions:

  • Hierarchical assembly, structural fluctuations, and scaling behavior are crucial for protein fractal architecture stability.
  • This work provides a framework for understanding biomolecular fractal assembly.
  • Insights into limitations of higher-order fractal growth in biological systems were gained.