Membrane ion channels that play important roles in generation of the action potential:

T (transient) channels 

L (long-lasting) channels Voltage gated potassium ion channel

TLS Online TPP Program

#Id: 8520

#Unit 2. Cellular Organization

Post-translational modifications of tubulin:

Lysine acetylation

Detyrosylation

Polyglutamylation

Polyglycylation

TLS Online TPP Program

#Id: 8521

#Unit 2. Cellular Organization

Lysine acetylation & Detyrosylation are found only on α-tubulin and are absent from β-tubulin.

TLS Online TPP Program

#Id: 8522

#Unit 2. Cellular Organization

Lysine acetylation 

ε-amino group of a specific lysine of α-tubulin

Microtubules are stabilized against breakage (centrioles, basal bodies, & primary cilia)

TLS Online TPP Program

#Id: 8523

#Unit 2. Cellular Organization

TLS Online TPP Program

#Id: 8524

#Unit 2. Cellular Organization

Detyrosylation 

tyrosine can be removed by a carboxypeptidase, where it sequentially removes the C-terminal tyrosines from α-tubulin subunits. 

TLS Online TPP Program

#Id: 8525

#Unit 2. Cellular Organization

Detyrosylated microtubules are more stable, because they are more resistant to depolymerization by kinesin-13 and related proteins.