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Subcellular Fractionation for ERK Activation Upon Mitochondrial-derived Peptide Treatment

Subcellular Fractionation for ERK Activation Upon Mitochondrial-derived Peptide Treatment

Published on: September 25, 2017

The Akt isoforms are present at distinct subcellular locations.

Stacey A Santi¹, Hoyun Lee

¹Tumor Biology Group, Northeastern Ontario Regional Cancer Centre, 41 Ramsey Lake Rd., Sudbury, ON, P3E 5J1, Canada.

American Journal of Physiology. Cell Physiology

|December 19, 2009

Summary

This study reveals distinct subcellular localizations for Akt isoforms, with Akt1 in the cytoplasm, Akt2 with mitochondria, and Akt3 in the nucleus. These findings clarify isoform-specific roles in cell signaling and metabolism.

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A Guide to Production, Crystallization, and Structure Determination of Human IKK1/α

A Guide to Production, Crystallization, and Structure Determination of Human IKK1/α

Published on: November 2, 2018

Area of Science:

Cellular Biology
Molecular Biology
Biochemistry

Background:

The Akt signaling pathway regulates critical cellular processes including proliferation, metabolism, and apoptosis.
Three Akt isoforms (Akt1, Akt2, Akt3) exist, but their specific functions and localizations remain largely unclear.
Understanding isoform-specific roles is crucial for deciphering Akt pathway regulation.

Purpose of the Study:

To investigate the subcellular localization and expression patterns of individual Akt isoforms.
To determine if cellular stress or specific cellular contexts alter Akt isoform localization.
To elucidate the functional implications of distinct Akt isoform localizations.

Main Methods:

Examined subcellular localization of Akt isoforms in various cell types (transformed and non-transformed).
Utilized small interfering RNA (siRNA) to ablate specific Akt isoforms.
Observed localization changes in response to ionizing radiation and epidermal growth factor (EGF).

Main Results:

Akt1 localized to the cytoplasm, with nuclear presence in HEK-293 cells and cytoplasmic localization influenced by SV40 T-antigen in HEK-293T cells.
Akt2 was found colocalized with mitochondria, suggesting a role in energy metabolism and apoptosis suppression.
Akt3 localized to the nucleus and nuclear membrane; isoform localization was unaffected by stress or ablation of other isoforms.

Conclusions:

Akt isoforms exhibit distinct subcellular localizations, indicating specialized functions.
Akt2's mitochondrial localization suggests involvement in metabolic regulation and apoptosis.
Akt3's nuclear localization points to roles in nuclear processes.
Isoform-specific functions are not compensated by other isoforms, highlighting their unique contributions to cellular signaling.