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In eukaryotes, transcription and translation are compartmentalized; an mRNA is first synthesized in the nucleus and then selectively transported to the cytoplasm for protein synthesis. Before transport, a pre-mRNA undergoes several steps of post-transcriptional modifications including splicing, 5' capping, and the addition of a poly-adenine tail. Various proteins bind to the pre-mRNA during these modifications. The mRNA transport takes place with the help of multiple proteins playing...
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Eukaryotic cells have different membrane-bound organelles with distinct protein requirements. The process by which proteins are targeted to a specific organelle is called protein sorting.
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Nuclear protein sorting is the selective trafficking of histones, polymerases, gene regulatory proteins into the nucleus and exporting RNAs and ribosomes to the cytosol. It is a tightly controlled process that regulates gene expression within a cell.
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Proteins targeted to the nucleus carry short stretches of amino acid sequences called the nuclear localization signal or NLS. Classical nuclear localization signals are of two types: monopartite and bipartite NLS. Monopartite classical NLS (cNLS) consists of a single cluster of 4-8 amino acids. Bipartite cNLS consists of two clusters of  2-3 amino acids and a 9-12 residue long proline-rich linker bridging the two clusters. Signal clusters are rich in positively charged amino acids such as...
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Nuclear protein sorting regulates nucleus composition and gene expression, crucial for determining the fate of a eukaryotic cell. Hence, the entry and exit of molecules across the nuclear envelope is a tightly controlled process. Nuclear protein sorting can be inhibited by one of the following ways: 1) masking cargo signal sequences, 2) modifying the nuclear receptor's affinity for cargo, 3) controlling the nuclear pore size, 4) retaining the cargo during its transit to the cytosol or the...
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Different physical properties of lipids and proteins allow them to localize and form distinct islands or domains in the membrane. Some membrane domains are formed due to protein-protein interactions, whereas others are formed due to the presence of specific lipids such as sphingolipids and sterols—for example, large proteins, such as bacteriorhodopsin, aggregate and create distinct domains.
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In situ Subcellular Fractionation of Adherent and Non-adherent Mammalian Cells
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How cells know where they are.

Arthur D Lander1

  • 1Department of Developmental and Cell Biology, and Center for Complex Biological Systems, University of California Irvine, Irvine, CA 92697, USA. adlander@uci.edu

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Summary
This summary is machine-generated.

Cells make location-based decisions for development and physiology. Achieving high reliability in these cellular processes requires complex strategies beyond simple principles, especially during development.

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Area of Science:

  • Cell biology
  • Developmental biology
  • Physiology

Background:

  • Cellular location is crucial for development, regeneration, and daily physiological functions in both plants and animals.
  • The mechanisms enabling cells to sense their position are fundamental to biological processes.
  • While seemingly simple, the principles governing cellular spatial awareness become complex when high reliability is essential, particularly during development.

Purpose of the Study:

  • To explore the sophisticated strategies cells employ to determine their location.
  • To understand how cells integrate information from diffusible molecules, control circuits, and gene regulatory networks.
  • To bridge the gap between cellular spatial sensing mechanisms and the demands of real-world biological precision and accuracy.

Main Methods:

  • Analysis of diffusible signaling molecules.
  • Investigation of cellular control circuits.
  • Examination of gene regulatory networks.

Main Results:

  • Cellular location decisions are guided by complex, rather than simple, principles when high reliability is needed.
  • Diverse molecular signals, control circuits, and gene networks contribute to cellular spatial awareness.
  • Biological systems must reconcile intricate cellular mechanisms with stringent requirements for precision and accuracy.

Conclusions:

  • The precise spatial organization of cells, vital for development and function, relies on sophisticated and complex biological strategies.
  • Understanding these strategies is key to addressing challenges in developmental biology and regenerative medicine.
  • Future research must focus on the interplay between molecular mechanisms and the functional constraints of biological systems.