Describe critical concentration (Cc) • Describe actin/microtubule polymerization • Contrast “T” and “D” forms of actin and microtubule subunits – Which nucleotide is bound to actin monomers in “T” and “D” forms? – Which nucleotide is bound to microtubule dimers in “T” and “D” forms? – Which subunit form, “T” or “D,” has higher affinity for polymerization? What are the implications of this on Cc(T) and Cc(D)?

Human Anatomy & Physiology (11th Edition)
11th Edition
ISBN:9780134580999
Author:Elaine N. Marieb, Katja N. Hoehn
Publisher:Elaine N. Marieb, Katja N. Hoehn
Chapter1: The Human Body: An Orientation
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Describe critical concentration (Cc)
• Describe actin/microtubule polymerization
• Contrast “T” and “D” forms of actin and microtubule subunits
– Which nucleotide is bound to actin monomers in “T” and “D” forms?
– Which nucleotide is bound to microtubule dimers in “T” and “D” forms?
– Which subunit form, “T” or “D,” has higher affinity for polymerization? What are the implications of this on Cc(T) and Cc(D)?

Rate of polymerization vs. concentration of
soluble actin/microtubule subunits
grow
- elongation rate
shrink
Cc(T)
treadmilling range
CC(D)
at T
plus
end
For Cc(T) <C<Cc(D)
at D
minus
end
subunit
concentration
(Soluble T)
5
Transcribed Image Text:Rate of polymerization vs. concentration of soluble actin/microtubule subunits grow - elongation rate shrink Cc(T) treadmilling range CC(D) at T plus end For Cc(T) <C<Cc(D) at D minus end subunit concentration (Soluble T) 5
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