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Rab Cascades

Rab Cascades

Rab GTPases act in a regulated cascade during membrane fusion, helping the lipid bilayers mix. The Rab family of proteins are active when bound to GTP, and inactive when bound to GDP. Hence, they act as guanine nucleotide-dependent molecular switches. Rab-GTP recognizes and binds to long or short-range tethering proteins to capture the target vesicle. These tethers coordinate with SNAREs on the vesicle and the target membrane to assemble the trans SNARE complex that locks the mixing bilayers.

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Related Experiment Video

Updated: Jan 2, 2026

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The human-specific paralogs SRGAP2B and SRGAP2C differentially modulate SRGAP2A-dependent synaptic development.

Ewoud R E Schmidt^1,2, Justine V Kupferman^1,2, Michelle Stackmann^1,2

¹Department of Neuroscience, Columbia University, New York, USA.

Scientific Reports

|December 12, 2019

Summary

This summary is machine-generated.

Human-specific gene duplications created SRGAP2B and SRGAP2C, which alter synaptic development. SRGAP2C uniquely modifies synaptic density in adulthood by inhibiting SRGAP2A, contributing to human brain evolution.

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Last Updated: Jan 2, 2026

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Published on: March 17, 2014

Area of Science:

Neuroscience
Evolutionary Biology
Genetics

Background:

Human-specific gene duplications (HSGDs) significantly impact brain development and evolution.
The molecular mechanisms of HSGDs, particularly SRGAP2 paralogs, are not fully understood.
SRGAP2A regulates excitatory and inhibitory synapse maturation, while its human-specific paralogs SRGAP2B and SRGAP2C have distinct functions.

Purpose of the Study:

To elucidate the molecular mechanisms by which SRGAP2B and SRGAP2C influence neuronal function.
To investigate the evolutionary significance of SRGAP2 gene duplications in human brain development.
To understand how SRGAP2C's unique properties contribute to human-specific synaptic characteristics.

Main Methods:

Protein instability assays in neurons.
Analysis of hetero-dimerization between SRGAP2A and SRGAP2C.
Proteasome activity assays.
Investigation of SRGAP2C's long-term effects on synaptic density in adulthood.
Comparative analysis of SRGAP2B and SRGAP2C mutations.

Main Results:

SRGAP2B and SRGAP2C proteins are intrinsically unstable in neurons.
Hetero-dimerization with SRGAP2A leads to proteasome-dependent degradation of SRGAP2A.
SRGAP2C induces long-lasting changes in synaptic density, unlike SRGAP2B.
Specific mutations in SRGAP2C, particularly those affecting arginine residues, are crucial for its unique inhibitory function on SRGAP2A.

Conclusions:

Evolutionary changes leading to SRGAP2 paralogs generated unstable proteins that modulate SRGAP2A levels.
SRGAP2C's unique ability to inhibit SRGAP2A drives human-specific synaptic development and maturation.
These findings highlight the role of HSGDs in shaping unique human neural characteristics and brain evolution.