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Related Concept Videos

Summation Notation01:25

Summation Notation

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Sigma notation, also known as summation notation, provides a concise method for representing the sum of a sequence of terms that follow a regular pattern. It utilizes the uppercase Greek letter sigma (∑), A typical expression is:In this form, k the index of summation is 1, the starting value, and n the ending value. The term ak​ represents the general term of the sequence.For example, the increasing sequence 5, 7, 9, ..., 23 over 10 terms can be expressed as:This simplifies the...
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Assembly of Signaling Complexes01:30

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Multiprotein signaling complexes are formed in a dynamic process involving protein-protein interactions at the cytoplasmic domain of transmembrane receptors or enzymatic and non-enzymatic proteins associated with the receptor. These complexes ensure the activation and propagation of intracellular signals that regulate cell functions.
Interaction domains in cell signaling
Interaction domains recognize exposed features of their binding partners containing post-translationally modified sequences,...
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Global Regulatory Systems01:28

Global Regulatory Systems

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Global regulatory systems in bacteria enable rapid and coordinated responses to environmental changes by integrating sensory inputs with gene expression, ensuring efficient adaptation to fluctuating conditions. Key global regulatory mechanisms include regulons, two-component systems, sigma factors, and secondary messengers.Regulons and Global RegulatorsA regulon is a collection of genes and operons controlled by a common global regulator. These regulators enable bacteria to prioritize resource...
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G Protein-coupled Receptors01:15

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G Protein-Coupled Receptors or GPCRs are membrane-bound receptors that transiently associate with heterotrimeric G proteins and induce an appropriate response to sensory stimuli such as light, odors, hormones, cytokines, or neurotransmitters.
GPCRs are also called heptahelical, 7TM, or serpentine receptors, and consist of seven (H1-H7) transmembrane alpha-helices that span the bilayer to form a cylindrical core. The transmembrane helices are connected by three extracellular loops and three...
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Overview of Secretory Vesicles01:33

Overview of Secretory Vesicles

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Secretory vesicles, also known as dense core vesicles (DCVs), are membrane-bound vesicles that transport secretory proteins, such as hormones or neurotransmitters. Regulated secretory vesicles transport proteins from the trans-Golgi network to the exterior of the cell. Proteins present in regulated secretory vesicles are required to be rapidly exocytosed in large amounts upon a specific stimulus.
Various proteins regulate the aggregation of molecules inside the secretory vesicles. Chromogranins...
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Updated: Mar 9, 2026

A Pipeline to Investigate the Structures and Signaling Pathways of Sphingosine 1-Phosphate Receptors
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Structural Insights into Sigma1 Function.

Andrew Kruse1

  • 1Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Seeley G. Mudd Building, 250 Longwood Ave., Boston, MA, 02115, USA. Andrew_Kruse@hms.harvard.edu.

Handbook of Experimental Pharmacology
|December 21, 2016
PubMed
Summary
This summary is machine-generated.

The sigma-1 receptor, a transmembrane protein, has had its molecular structure revealed through recent crystallographic studies. This breakthrough provides a framework for understanding its function in diseases like neurodegeneration and cancer.

Keywords:
Crystal structureLigand bindingOligomerSigma-1 receptorSigma1X-ray crystallography

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Area of Science:

  • Molecular Biology
  • Structural Biology
  • Neuroscience

Background:

  • The sigma-1 receptor is an enigmatic transmembrane protein involved in various biological processes.
  • Its molecular architecture has remained largely unclear despite extensive research.

Purpose of the Study:

  • To elucidate the molecular architecture of the sigma-1 receptor.
  • To provide a high-resolution structural view of the sigma-1 receptor.

Main Methods:

  • Oligomerization studies of the sigma-1 receptor.
  • High-resolution crystallographic analysis of the sigma-1 receptor structure.

Main Results:

  • Recent crystallographic studies have provided the first high-resolution molecular structure of the sigma-1 receptor.
  • The sigma-1 receptor has been established as an oligomer.
  • These structural insights offer a framework for interpreting mutagenesis data and ligand interactions.

Conclusions:

  • The structural era of sigma-1 receptor research is beginning.
  • New discoveries and reevaluation of existing data are anticipated.
  • Understanding the molecular basis of sigma-1 receptor function and interactions is now feasible.