chemical aspects of the cell
TRANSCRIPT
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Chemical aspects of the cell
Compounds that induce cell proliferation, differentiation and death
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Cell proliferation
2
The cell cycle
Chapter 17 – Molecular Biology of the Cell
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Cell cycle
3 Chapter 17 – Molecular Biology of the Cell
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Cell cycle control
4 Chapter 17 – Molecular Biology of the Cell
G1/S-cyclins activate Cdks in late G1 and thereby help trigger progression through Start,
resulting in a commitment to cell-cycle entry. Their levels fall in S phase.
S-cyclins bind Cdks soon after progression through Start and help stimulate chromosome
duplication. S-cyclin levels remain elevated until mitosis, and these cyclins also contribute to the
control of some early mitotic events.
M-cyclins activate Cdks that stimulate entry into mitosis at the G2/M transition. M-cyclin levels fall
in mid-mitosis.
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Cell cycle control
5 Chapter 17 – Molecular Biology of the Cell
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Cell cycle control – CDK activation
6 Chapter 17 – Molecular Biology of the Cell
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Cell cycle control – CDK regulation
7 Chapter 17 – Molecular Biology of the Cell
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Cell cycle control – CDK inhibitors
8
Palbociclib: inhibitor of CDK4 and 6
Drug in use for a type of breast cancer
Rocca A, Farolfi A, Bravaccini S, Schirone A, Amadori
D. Expert Opin. Pharmacother. 2014, 15, 407-420.
Sánchez-Martínez, C.; Gelbert L.M.; Lallena, M.J.; de Dios, A. Bioorg. Med. Chem. Lett. 2015, 25, 3420-3435.
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Cell cycle control – CDK inhibitors
9 Sánchez-Martínez, C.; Gelbert L.M.; Lallena, M.J.; de Dios, A. Bioorg. Med. Chem. Lett. 2015, 25, 3420-3435.
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Cell cycle control – CDK inhibitors
10 Sánchez-Martínez, C.; Gelbert L.M.; Lallena, M.J.; de Dios, A. Bioorg. Med. Chem. Lett. 2015, 25, 3420-3435.
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The key regulator is the anaphase-
promoting complex, or cyclosome
(APC/C) for proteolysis. SCF is
also important.
11 Chapter 17
Molecular Biology of the Cell
Cell cycle control – proteolysis
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Structure of Skp, Cullin, F-box (SCF) complex
12 Fig. 3.71 -Molecular Biology of the Cell
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Proteasome inhibitors
13 Manasanch, E.E.; Orlowski, R.Z. Nat. Rev. Clin. Oncol. 2017, in press, doi:10.1038/nrclinonc.2016.206
Bortezomib (drug)
Carfilzomib (drug)
Ixazomib (drug) Oprozomib (investigational)
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Cell cycle control
14 Chapter 17 – Molecular Biology of the Cell
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Cell cycle – mitosis
15 Chapter 17 – Molecular Biology of the Cell
Prophase Prometaphase Metaphase Anaphase Telophase
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Cell cycle – traction force
16 Chapter 17 – Molecular Biology of the Cell
Microtubule attachment sites in the kinetochore
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Inhibition of the mitotic spindle
17 https://www.drugs.com/drug-class/mitotic-inhibitors.html
Taxanes Vinca alkaloids
Docetaxel
Placlitaxel
Vinblastine
Vincristine
Colchicine and podophylotoxin are some other drugs.
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Inhibition of the mitotic spindle
18 Kiselyov, A.S. et al. Eur. J. Med. Chem. 2010, 45, 1683-1697
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Cell cycle – chromatin separation
19 Chapter 17 – Molecular Biology of the Cell
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Cell cycle – cytokineses
20 Chapter 17 – Molecular Biology of the Cell
RhoA: Ras homolog gene family, member A
RhoGAP domain: evolutionary conserved protein
domain of GTPase activating proteins
RhoGEF domain: structural domain of guanine
nucleotide exchange factors
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21 Chapter 17 – Molecular Biology of the Cell
Cell stimulation
Stimulation of
the cell division
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Cell growth
22 Chapter 17 – Molecular Biology of the Cell
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Cell arrest and death
23
Cell-cycle arrest or apoptosis induced by excessive stimulation of mitogenic
pathways. Abnormally high levels of Myc cause the activation of Arf, which binds and
inhibits Mdm2 and thereby increases p53 levels.
Chapter 17 – Molecular Biology of the Cell
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Cell death
24
Apoptosis (A and B) and Necrosis (C)
Chapter 18 – Molecular Biology of the Cell
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Cell death - apoptosis
25 Chapter 18 – Molecular Biology of the Cell
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Apoptosis – DNA fragmentation
26 Chapter 18 – Molecular Biology of the Cell
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Apoptosis – extrinsic pathway
27 Chapter 18 – Molecular Biology of the Cell
DISC: Death-inducing signaling complex
FADD: Fas-associated protein with death domain
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Apoptosis – intrinsic pathway
28 Chapter 18 – Molecular Biology of the Cell
Apaf1: apoptotic protease activating factor-1
CARD: Caspase recruitment domain from Apaf1
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Apoptosis – intrinsic pathway
29 Chapter 18 – Molecular Biology of the Cell
Pro-apoptotic effector Bcl2 family proteins (mainly Bax and Bak) lead to the release of
mitochondrial intermembrane proteins in the intrinsic pathway of apoptosis.
BID: BH3 interacting-domain death agonist
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Apoptosis – inhibition of BclXL
30 Chapter 18 – Molecular Biology of the Cell
2YXJ
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Apoptosis – role of IAP
31 Chapter 18 – Molecular Biology of the Cell