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Related Concept Videos

Coordination Number and Geometry02:57

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For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
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Most animal cells comprise a pair of centrioles together called a centrosome. The cell duplicates its centrosome and contains two centrosomes side-by-side, which begin to move apart during the prophase. As the centrosomes migrate to two different sides of the cell, microtubules start extending from each centrosome toward the other end. The mitotic spindle is composed of the centrosomes and their emerging microtubules.
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The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
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This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
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Integration of intracellular signaling: Biological analogues of wires, processors and memories organized by a centrosome 3D reference system.

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The Centrosome as a Geometry Organizer.

Marco Regolini1

  • 1AudioLogic, Department of Bioengineering and Mathematical Modeling, Milano, Italy. Ing.regolini@gmx.com.

Results and Problems in Cell Differentiation
|August 23, 2019
PubMed
Summary

The geometric design of centrioles, featuring two orthogonal cylinders, suggests a function as a cellular compass. This structure may organize cell geometry and guide cellular processes, a role recently supported by studies on cilia orientation.

Area of Science:

  • Cell Biology
  • Biophysics
  • Developmental Biology

Background:

  • The centrosome, with its intricate structure of 200 protein types, has a poorly understood function despite extensive research.
  • While dispensable for mitosis in some organisms, centrosomes are crucial for early development, as seen in fly zygotes.
  • The centrosome's duplication cycle and reduction in gametes present complex biological puzzles.

Purpose of the Study:

  • To explore the hypothesis that the geometric design of centrioles implies their function in cellular orientation and organization.
  • To investigate the centrosome's potential role as a cellular compass and organizer of cell geometry.
  • To connect the physical structure of centrosomes with their observed roles in cellular processes and development.

Main Methods:

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  • Review of existing literature on centrosome structure, function, and biological roles.
  • Analysis of the geometric properties of centrioles (two orthogonal, ninefold symmetric cylinders).
  • Integration of recent findings on primary cilia orientation in zebrafish and mouse models.

Main Results:

  • The orthogonal, cylindrical structure of centrioles aligns with the principles of a simple device for directional sensing, akin to a goniometer.
  • The centrosome's geometry suggests it can establish and maintain a precise cellular geometry inherited across cell divisions.
  • Recent studies show primary cilia, connected to basal bodies (centrosomes), exhibit chiral orientation and sense flow directionality, supporting a geometric role.

Conclusions:

  • The striking geometric design of the centrosome strongly suggests a primary function in organizing cell geometry and acting as a cellular compass.
  • This geometric role is crucial for processes like polarity establishment, as observed in Caenorhabditis elegans zygotes.
  • The centrosome's ability to orient cellular components, potentially via its microtubule aster, is key to its proposed function in intracellular navigation.