Secreted Protein Production
Secreted Protein Production - Related Videos
07:09
A Convenient and General Expression Platform for the Production of Secreted Proteins from Human Cells
0 Views •
Cited by 17 •
2012
In the post-human genomics era, the availability of recombinant proteins in native conformations is crucial to structural, functional and therapeutic research and development. Here, we describe a test- and large-scale protein expression system in human embryonic kidney 293T cells that can be used to produce a variety of recombinant proteins.
12:40
Cultivation of Heligmosomoides Polygyrus: An Immunomodulatory Nematode Parasite and its Secreted Products
0 Views •
Cited by 105 •
2015
Heligmosomoides polygyrus is a murine nematode with powerful immunomodulatory capabilities that closely resemble those of highly-prevalent human helminth infection. Here we describe a protocol for the long-term maintenance of the H. polygyrus lifecycle.
01:26
Bacterial Translocation and Protein Secretion
0 Views •
2025
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...
05:51
Coculture Analysis of Extracellular Protein Interactions Affecting Insulin Secretion by Pancreatic Beta Cells
0 Views •
Cited by 3 •
2013
Transcellular protein interactions are important determinants of pancreatic beta-cell function. Detailed here is a method—adapted from a coculture model of synaptogenesis—for investigating how specific transmembrane proteins influence insulin secretion. Transfected HEK293 cells express proteins of interest; beta cells do not need to be transfected or otherwise directly perturbed.
10:23
Analysis of Epididymal Protein Synthesis and Secretion
0 Views •
Cited by 14 •
2018
Here, we report the immunofluorescence localization of dynamin to illustrate the protocols for the detection of proteins in paraffin-embedded mouse epididymal sections and those of an immortalized epididymal cell line (mECap18). We also describe the protocols for the isolation of secretory proteins from both epididymal fluid and conditioned cell media.
FAQs
An N-terminal signal peptide acts as an addressing sequence for a protein being made for secretion. It directs the ribosome to the endoplasmic reticulum, allowing the growing polypeptide to enter this compartment rather than remain in the cytosol. This targeting step connects protein synthesis with the downstream secretory pathway.
The endoplasmic reticulum and Golgi apparatus provide successive processing environments. In the endoplasmic reticulum, newly synthesized proteins fold and undergo post-translational modification. They then move through the Golgi, where further processing occurs before packaging into transport vesicles. These stages help prepare proteins for their extracellular functions.
After processing, secreted proteins leave the Golgi apparatus inside transport vesicles. The vesicles carry their protein cargo to the cell surface, where exocytosis releases it into the extracellular environment. This final step connects intracellular packaging with functions outside the cell, including communication, defense, digestion, and tissue organization.
A defect at any stage can disrupt protein synthesis, folding, modification, transport, or release. As a result, cells may fail to deliver proteins needed for hormone or antibody release, extracellular matrix assembly, or other extracellular activities. Studying these failures links secretory pathway mechanisms with disease-related changes in cell and tissue function.
A useful pathway sequence begins with synthesis of a protein containing an N-terminal signal peptide, followed by ribosome targeting to the endoplasmic reticulum. The protein then enters the endoplasmic reticulum, undergoes folding and modification, passes through the Golgi apparatus, enters transport vesicles, and is released by exocytosis.
Extracellular proteins can participate in communication, defense, digestion, and tissue organization. Hormones and antibodies illustrate release-dependent biological roles, while extracellular matrix assembly shows how secreted proteins contribute to tissue structure. The location of the released protein therefore helps determine which cells, tissues, or extracellular processes it can influence.
Cultured cells can be used to produce therapeutic proteins through their own secretory machinery. This approach draws on the cellular sequence of endoplasmic reticulum entry, folding, modification, Golgi processing, vesicle transport, and extracellular release. Understanding the pathway helps connect cell biology with the production of proteins intended for therapeutic applications.