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Related Concept Videos

Bacterial Translocation and Protein Secretion01:26

Bacterial Translocation and Protein Secretion

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Bacterial protein secretion involves translocation systems to ensure proteins reach their designated locations, including the plasma membrane, periplasm, outer membrane, or the external environment. These translocation systems are vital for bacterial physiology, supporting processes like membrane assembly, enzymatic activity in the periplasm, and interactions with the external environment. The division of labor between Sec and Tat pathways ensures efficiency in handling proteins with diverse...
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Gram-negative Bacterial Protein Secretion Systems01:17

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Gram-negative bacteria utilize sophisticated protein secretion systems to transport proteins across their double-membrane envelope into the extracellular environment or host cells. Based on their mechanism of action, these systems are classified into one-step and two-step pathways.One-Step Secretion Systems (Types I, III, IV, and VI)One-step secretion systems bypass the periplasm entirely, forming a continuous channel that spans both the inner and outer membranes:Type I Secretion System (T1SS):...
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Regulation of hormone secretion is a finely tuned orchestration driven by various types of stimuli, encompassing neural, humoral, and hormonal signals. Environmental cues instigate neural stimuli, where action potentials traverse nerve fibers to reach their designated targets. An illustrative scenario is the body's response to stress, wherein the sympathetic nervous system releases epinephrine from the adrenal glands, inducing the well-known 'fight or flight' reaction.
Humoral...
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Hormones Secreted by the Stomach01:25

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Enteroendocrine cells, accounting for only 1% of stomach epithelial cells, play a significant role in digestion and are classified by their digestive hormone secretions.
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Pancreatic Juice and Secretion01:26

Pancreatic Juice and Secretion

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Pancreatic juice is a clear fluid produced by the pancreas, containing water, salts, sodium bicarbonate, and enzymes vital for digestion in the small intestine. It helps break down large molecules, facilitating nutrient absorption.
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Tubular Reabsorption and Secretion01:28

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Tubular secretion and reabsorption are two critical processes in the nephron tubule of the kidneys. When the fluid filtered from the glomerulus enters the proximal convoluted tubule, it is referred to as filtrate, and its composition changes due to tubular reabsorption and secretion.
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Related Experiment Video

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Analysis of Epididymal Protein Synthesis and Secretion
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Analysis of Mycobacterial Protein Secretion.

Alka Mehra1, Jennifer A Philips1

  • 1Department of Medicine, Division of Infectious Diseases, New York University School of Medicine, New York, USA.

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This study presents a protocol for analyzing secreted proteins from Mycobacterium tuberculosis (Mtb) and related species. The method uses whole cell extracts and culture filtrate fractions for identifying potential virulence factors and biomarkers.

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Area of Science:

  • Microbiology
  • Immunology
  • Biochemistry

Background:

  • Mycobacterium tuberculosis (Mtb) causes tuberculosis.
  • Secreted proteins from Mtb are crucial for host interaction, virulence, and potential biomarkers.
  • Understanding the Mtb secretome aids in developing diagnostics and therapeutics.

Purpose of the Study:

  • To establish a standardized protocol for preparing whole cell extracts (WCE) and short-term culture filtrate (CF) from Mtb and BCG.
  • To enable the analysis of secreted proteins for identifying virulence factors, antigens, and biomarkers.
  • To provide a adaptable method for studying the secretome of various mycobacterial species.

Main Methods:

  • Preparation of WCE and CF from slow-growing mycobacteria (Mtb, BCG) and adaptation for rapid growers (Msmeg).
  • Analysis of protein fractions using Western blotting or mass spectrometry.
  • Inclusion of genetic knockout mutants as negative controls and assessment of cytosolic proteins (GroEL, sucB) to rule out lysis.

Main Results:

  • A reproducible protocol for obtaining WCE and CF fractions from mycobacteria.
  • Demonstration of Western blotting and mass spectrometry as viable analysis techniques.
  • Establishment of controls to ensure accurate identification of secreted proteins.

Conclusions:

  • The described protocol provides a robust method for investigating the mycobacterial secretome.
  • This approach facilitates the identification of Mtb secreted proteins relevant to pathogenesis and host response.
  • The assay can be modified to study the impact of varying growth conditions on protein secretion.