powerpoint presentation - microtubules & their...
TRANSCRIPT
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Molecular Cell Biology
Microtubules and their Motors
Cooper
Wednesday, August 29, 2012
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Microtubules and their Motors
Intro
Vesicle Trafficking
Cilia
Mitosis
Wednesday, August 29, 2012
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Microtubule Structure
Cross-‐sec=on• Hollow tube• 24 nm wide• 13-‐15 protofilaments
Helical structure
Polar• Plus ends generally distal• Minus ends generally proximal (at MTOC)
Composed of Tubulin α/β Heterodimer
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Microtubule Structure & Assembly
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Microtubule Motors Defini=on
• Microtubule-‐s=mulated ATPase• Mo=lity along MT’s• Sequence of known motor
Dynein
• Moves to Minus End of Mt• Large, mul=-‐subunit protein
Kinesin
• Moves to Plus End of Mt• Excep=on -‐ Ncd/Kar3
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Discovery of Kinesin
Search for Motor for Axonal Transport
• Development of Video-‐enhanced DIC Imaging
Movement Requires ATP
AMPPNP Freezes Par=cles
Microtubule Affinity Chromatography
• Bind in AMPPNP, Release in ATP
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Kinesin Structure
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Kinesin Movement and Processivity
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Kinesin Superfamily Structures
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Kinesin Superfamily Phylogene=c Tree
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Cytoplasmic Dynein
Discovered Biochemically
Minus End Motor for Vesicle Transport
Requires Dynac=n Complex for Func=on
Moves the Mito=c Spindle
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Dynein and Kinesin Motor
Domain Structures
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Dynein Motor Subunit Architecture
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Model for Interac=ons between Dynein, Dynac=n Complex, Microtubules, and Cargo
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Membrane Trafficking -‐ ER and Golgi
Posi=oning ER & Golgi
• Golgi near MTOC
–Minus Ends are at MTOC
– Golgi Posi=on Requires Dynein
• ER– Tubular network spread about the cell
– Kinesin moves the tubules peripherally
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Microtubules (Red) and ER (Green)
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Vesicle Traffic: Trans-‐Golgi to Plasma Membrane
Kinesin -‐ “KIF13A”
• Discovered by sequencing
• Plus-‐end Directed, fast (0.3 µm/s)
• Binds AP-‐1 (affinity chromatography) and mannose 6-‐P receptor
• Inhibit func=on (express tail as dominant nega=ve) -‐> less M6PR at cell surface
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Xenopus MelanophorePigment GranuleMovement
Vesicle Move Along Microtubules
Vesicles Carry Dynein, Kinesin & Myosin-‐V
Regula=on of the motors accounts for the dispersion / aggrega=on
Inward Motion(Movie Loops)
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Xenopus MelanophorePigment GranuleMovement
Outward Motion(Movie Loops)
Vesicle Move Along Microtubules
Vesicles Carry Dynein, Kinesin & Myosin-V
Regulation of the motors accounts for the dispersion / aggregation
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Cilia in Ac=on
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Chlamydomonas Cilia Sperm Flagellum
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Cilia on Surface of Epithelial Cells
Pseudostratied ciliated epithelium in trachea. Human.
Mallory Azan High magnication.Wednesday, August 29, 2012
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Structure of Axoneme: Cross-‐sec=on
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Axonemes are Anchored at theirBase in Basal Bodies
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Conversion of Sliding to Bendingto Wave Forma=on
Slide on only side of axoneme
Propagate down the long axis
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Rota=on of Central Pair
Whole ChlamydomonasCell w/ Two Flagella
Axonemes Isolated from Chlamydomonas
Dark-‐Field Microscopy
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Experimental Approaches to Study Cilia in Chlamydomonas
Axoneme 2-‐D gel -‐ 250 polypep=des!
Mutants -‐ Collect & Characterize
What Structures and Polypep=des Missing?
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Missing Structures in Mutant
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Missing Polypep=des in Mutant
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Primary Cilium
Kidney Tubule Epithelium
Defec=ve in Polycys=c Kidney Disease
• 4th most common cause of kidney failure
• Autosomal Dominant
How does loss of the cilium cause the disease?
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Mitosis Background
Names of Stages: Interphase, prophase, metaphase, anaphase, telophase
Interphase MTs disassemble then reassembly as Spindle MTs
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Mitosis Stages: Spinning-Disk Confocal Images of Microtubules and DNA
Early Anaphase
Late Anaphase
MetaphasePrometaphase
Cytokinesis Onset Late Cytokinesis
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Boveri: Centrosome and Centriole
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Centrosomes
Animals: Centriole Pair in Amorphous Cloud
Ends of MT’s in Cloud.No Rela=onship to Centrioles. Different from Rela=onship of Basal Body and Axoneme MT’s.
Flowering Plants: Lack Centrioles
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Centrosome Ultrastructure
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Centriole Fine Structure
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Mito=c Spindle Assembly
Centrosome duplicates and separates
Nuclear envelope breakdown in animals
MT’s rearrange via dynamic instability
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Spindle MT’s
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Dynac=n RNAi
Control
Mito=c Spindle Rota=on in C. elegans Embryo
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Chromosome Congression to Metaphase Plate
Kinetochores capture MT’s
Chromosome pulled to Pole
• Force at Kinetochore
Chromosome pushed away from Pole
• Forces on arms• Force at Kinetochore
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Microtubule / Kinetochore Akachment
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Metaphase Normal
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Types of Mt / Kc Akachment
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Metaphase -‐ Merotelic Chrom
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Metaphase -‐ Merotelic Chrom
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Metaphase -‐ Merotelic Chrom
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Metaphase to Anaphase
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Metaphase/Anaphase Lagging
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Anaphase
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Centromere splits and Chromosomes Move
Anaphase A: Chromosome to Pole
GFP-‐labeledCentromeres
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Models for Chromosomes Moving to the Pole
Treadmilling?
• Depolymeriza=on at Pole
Depolymeriza=on at Kinetochore
• How remain bound while end shrinks?
Motors at Kinetochore or Pole
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Pac-‐Man and Poleward Flux Models for Anaphase A
Wednesday, August 29, 2012
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Poleward Tubulin Flux in Anaphase A
Movement to Pole...
•Blue: Photobleach Mark, 0.7 µm/min
•Yellow: Edge of Chromosome, 1.2 µm/min
Wednesday, August 29, 2012
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Kinetochore as a slip-‐clutch mechanism
High tension:Switch to polymeriza=on to prevent detachment
Low tension: Depolymeriza=on generates force and movement
Wednesday, August 29, 2012
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Anaphase B
Pole -‐ Pole Separa=on
Wednesday, August 29, 2012
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End
Wednesday, August 29, 2012