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Related Concept Videos

Protein and Protein Structure02:15

Protein and Protein Structure

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Proteins are one of the most abundant organic molecules in living systems and have the most diverse range of functions of all macromolecules. Proteins may be structural, regulatory, contractile, or protective. They may serve in transport, storage, or membranes; or they may be toxins or enzymes. Their structures, like their functions, vary greatly. They are all, however, amino acid polymers arranged in a linear sequence.
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Chirality02:25

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Chirality is a term that describes the lack of mirror symmetry in an object. In other words, chiral objects cannot be superposed on their mirror images. For example, our feet are chiral, as the mirror image of the left foot, the right foot, cannot be superposed on the left foot.
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Structural Protein Function01:56

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Structural proteins are a category of proteins responsible for functions ranging from cell shape and movement to providing support to major structures such as bones, cartilage, hair, and muscles. This group includes proteins such as collagen, actin, myosin, and keratin.
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Chirality is the most intriguing yet essential facet of nature, governing life’s biochemical processes and precision. It can be observed from a snail shell pattern in a macroscopic world to an amino acid, the minutest building block of life. Most of the snails around the world have right-coiled shells because of the intrinsic chirality in their genes. All the amino acids present in the human body exist in an enantiomerically pure state, except for glycine - the sole achiral amino acid.
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A Micropatterning Assay for Measuring Cell Chirality
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Chirality and Handedness of Protein Structures.

A V Efimov1

  • 1Institute of Protein Research, Russian Academy of Sciences, Pushchino, Moscow Region, 142290, Russia. efimov@protres.ru.

Biochemistry. Biokhimiia
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Summary
This summary is machine-generated.

Protein structures exhibit pseudo-chirality, or handedness, in various forms like helical and arrangement handedness. This property is crucial for understanding protein folding and modeling by limiting possible structures.

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Area of Science:

  • Structural biology
  • Biophysics
  • Protein science

Background:

  • Proteins are composed of polypeptide chains with diverse three-dimensional structures.
  • These structures include helices, superhelices, and hairpins, exhibiting non-superimposable, non-mirror-image properties.

Purpose of the Study:

  • To introduce and define the concept of pseudo-chirality (handedness) in protein structures.
  • To explore the different types and levels of handedness observed in proteins.
  • To highlight the significance of handedness in protein folding and modeling.

Main Methods:

  • Qualitative analysis of protein structural organization.
  • Identification and classification of handedness in various protein structural elements.
  • Review of existing literature on protein structure and folding.

Main Results:

  • Proteins exhibit pseudo-chirality, termed handedness, arising from their structural arrangements.
  • Two primary types of handedness exist: helical handedness and handedness of arrangement.
  • Handedness is prevalent across all structural levels, from secondary structures (e.g., alpha-helices) to complex motifs and supramolecular assemblies.
  • Specific protein structures like alpha-helices and beta-alpha-beta units possess unique handedness.

Conclusions:

  • Pseudo-chirality is an inherent property of protein structures at all organizational levels.
  • The presence of handedness significantly constrains the conformational space, simplifying protein folding and modeling.
  • Understanding protein handedness is vital for predicting protein structure and function.