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IP3/DAG Signaling Pathway01:11

IP3/DAG Signaling Pathway

Membrane lipids such as phosphatidylinositol (PI) are precursors for several membrane-bound and soluble second messengers. Specific kinases phosphorylate PI and produce phosphorylated inositol phospholipids. One such inositol phospholipids are the  phosphatidylinositol-4,5 bisphosphate [PI(4,5)P2], present in the inner half of the lipid bilayer. Upon ligand binding, GPCR stimulates Gq proteins to turn on phospholipase Cꞵ. Activated phospholipase Cꞵ cleaves PI(4,5)P2 and produces two-second...
Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
Feedback Regulation of Calcium Concentration01:27

Feedback Regulation of Calcium Concentration

Calcium is an essential signaling molecule required for various cellular functions. Calcium pumps and ion channels on cell and organellar membranes, such as those on the endoplasmic reticulum (ER), regulate calcium concentrations inside the cell. They remain closed, keeping the cytosolic calcium levels low at a resting state.
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Nitric Oxide Signaling Pathway01:28

Nitric Oxide Signaling Pathway

Nitric oxide (NO), an inorganic gas, acts as a potent second messenger in most animal and plant tissues. NO diffuses out of the cells that produce it and enters the neighboring cells to generate a downstream response. NO synthase (NOS) catalyzes NO production by the deamination of the amino acid arginine. There are three isoforms of NOS. Endothelial cells have endothelial NOS (eNOS), nerve and muscle cells have neuronal NOS (nNOS), and macrophages produce inducible NOS (iNOS) upon exposure to...
Calmodulin-dependent Signaling01:16

Calmodulin-dependent Signaling

Calmodulin (CaM) is a calcium-binding protein in eukaryotes that controls various calcium-regulated cellular processes. It has four calcium-binding sites that bind calcium to form the calcium-calmodulin ( Ca2+-CaM) complex. GPCR stimulation increases the calcium levels in the cells that bind to CaM and induces a conformational change.
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cAMP-dependent Protein Kinase Pathways01:25

cAMP-dependent Protein Kinase Pathways

Cyclic Adenosine Monophosphate (cAMP) is an essential second messenger that activates protein kinase A (PKA) and regulates various biological processes. A single epinephrine molecule binds to GPCR and activates several heterotrimeric G proteins, each stimulating multiple adenylyl cyclase, amplifying the signal, and synthesizing large numbers of cAMP molecules. Small changes in cAMP concentration affect PKA activity. The binding of four cAMP molecules induces a conformational change in PKA,...

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Visualizing Single Molecular Complexes In Vivo Using Advanced Fluorescence Microscopy
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Published on: September 8, 2009

Bringing the physical sciences into your cell biology research.

Douglas N Robinson1, Pablo A Iglesias

  • 1Department of Cell Biology and Department of Pharmacology and Molecular Sciences, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA. dnr@jhmi.edu

Molecular Biology of the Cell
|November 1, 2012
PubMed
Summary

Modern biology needs physicists and mathematicians to understand complex living systems. Integrating biological and physical sciences is key to deciphering molecular pathways and organismal functions.

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Area of Science:

  • Integrative biology
  • Systems biology
  • Biophysics

Background:

  • Historically, physics and mathematics dominated biological studies.
  • Modern molecular biology introduced new terminology and research approaches.
  • Vast data on biomolecules and pathways have been generated.

Purpose of the Study:

  • To address the challenge of understanding complex biological systems.
  • To integrate knowledge from biological and physical sciences.
  • To elucidate how molecular components contribute to healthy function.

Main Methods:

  • Interdisciplinary research approach.
  • Collaboration between biologists and physical scientists.
  • Systems-level analysis of biological data.

Main Results:

  • Identification of the need for integrated approaches.
  • Highlighting the gap between molecular data and system function.
  • Establishing a framework for interdisciplinary biological research.

Conclusions:

  • Complex living systems require an integrative approach.
  • Bridging biological and physical sciences is essential for future discoveries.
  • Understanding organismal function necessitates a holistic, interdisciplinary perspective.