nucleic acid nanomachines and the reimagined red blood cell
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Nucleic Acid Nanomachines and the Reimagined Red Blood Cell. short. “Give me a lever long enough… and I shall move the world.” --Archimedes of Syracuse. Matthew Mancuso BEE 7600, Professor Dan Luo - PowerPoint PPT PresentationTRANSCRIPT
Matthew Mancuso BEE 7600, Professor Dan LuoDepartment of Biomedical Engineering, Cornell University Presented Thursday February 17th, 2011
“Give me a lever long enough…
and I shall move the
world.”
--Archimedes of Syracuse
Nucleic Acid Nanomachines and the Reimagined
Red Blood Cell
Exploratory Design in Medical Nanotechnology: A Mechanical Artificial Red Cell,"Artificial Cells, Blood Substitutes, and Immobil. Biotech. 26(1998):411-430
Artist’s Rendering of a Respirocyte, a theoretical artificial red blood cell designed by Robert A.
Freitas Jr. exploring the limits of what molecular nanotechnology could create
short
What is an artificial red blood cell... ...and why is he talking about it?Red Blood cells are “simple” nanomachines…
they have only a few critical functions
This makes them an excellent candidate for exploratory design…Let’s see if we can do it better using DNA!
Oxygen from Lungs to Body Carbon Dioxide from Body to Lungs
Nucleic Acid Nanomachine Toolsand How We Can Use ThemWhy
Nucleic Acids?
Putting DNA to Work
Here Be Dragons…
A Nucleic Acid Nanomachine Toolbox
Tweezing WalkingRotating Switching
Base Pair Matching
DNA Machines and RBCs
The next Steps
“Biology has at least 50 more
interesting years…”
--James Watson
Why DNA Nanomachines?Sequence Specificity is the KEY
to Nucleic Acids application in nanomachinary
The more bases that bind, the higher the affinity…using this we can engineer multiple “states” into DNA systems
5’ T A C G T A C G T A C G3’ A T G C A T G C A T G C A T C C
5’ T A C G T A C G T A C G T A G G3’ A T G C A T G C A T G C A T C C
5’ T A C G T A C G T A C G T A G G+
+5’ T A C G T A C G T A C G
More base pairs binding is thermodynamically favorable
Nucleic Acid Tweezers
Bernard Yurke, Andrew J. Turberfield, Allen P. Mills, Jr, Friedrich C. Simmel & Jennifer L. Neumann. A DNA-fuelled molecular machine made of DNA. Nature 406, 605-608 (10 August 2000)
One of the first examples of a DNA nanomachine
Changes between two states indefinitely
Uses DNA for fuel, produces an inert byproduct
Nucleic Acid Tweezers
Bernard Yurke, Andrew J. Turberfield, Allen P. Mills, Jr, Friedrich C. Simmel & Jennifer L. Neumann. A DNA-fuelled molecular machine made of DNA. Nature 406, 605-608 (10 August 2000)
Stepping Motors
Jonathan Bath & Andrew J. Turberfield. DNA nanomachines. Nature Nanotechnology 2, 275 - 284 (2007)
DNA Fuels walking action
Can be used to move a specific number of cycles, and a specific distance
Can carry cargo
Uses DNA for fuel, produces an inert byproduct
Rotating Motors
H Yan, X Zhang, Z Shen & N C Seeman. A robust DNA mechanical device controlled by hybridization topology. Nature 415, 62-65 (3 January 2002) N C Seeman. From genes to machines: DNA nanomechanical devices. Trends in Biochemical Sciences.Volume 30, Issue 3, March 2005, Pages 119-125
Two states, one is rotated
Uses two set and unset strands
Uses DNA for fuel, produces an inert byproduct
Simple Logic Circuits
Simple switches form the basis for computation
If you can build a NAND gate, you can form a full
computer
Can provide signal processing without ever converting to electronic
Using DNA to make Artifical RBCs
“Molecular sorting rotors can be designed from about 105 atoms (including the housing), measuring roughly 7 nm x 14 nm x 14 nm…”
Exploratory Theoretical DesignActual Design
Y Tian and C Mao. Molecular Gears: A Pair of DNA Circles Continuously Rolls against Each Other. J. Am. Chem. Soc. 2004, 126, 11410-11411
Where are we headed?A synthesis of techniques
Y Tian and C Mao. Molecular Gears: A Pair of DNA Circles Continuously Rolls against Each Other. J. Am. Chem. Soc. 2004, 126, 11410-11411
Bottom Up Design Top Down Design
ChemistryDNA
NanotechnologyNanopatricles
Material Science
LithographyEtching
MicrofluidicsImprinting
Engineering
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