Super-Resolution Optical Microscopy - Huang Labhuanglab.ucsf.edu/Lectures/2012 UCSF...
Transcript of Super-Resolution Optical Microscopy - Huang Labhuanglab.ucsf.edu/Lectures/2012 UCSF...
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Super‐Resolution Optical Microscopy
Bo HuangMar 30, 2012
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1Å
1nm
10nm
100nm
1µm
10µm
0.1mm
1Å
1nm
10nm
100nm
1µm
10µm
0.1mm
1600 1700 1800 1900
Naked eye: ~ 50‐100 μm
1595, Zaccharias and Hans JanssenFirst microscope, 9x magnification
Antony Van Leeuwenhoek(1632‐1723), 200x Ernst Abbe (1840‐1905)
The “physical” diffraction limit
Compound microscope>1000x
2000
d 2 NA
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50 years to extend the resolution
• Confocal microscopy (1957)• Near‐field scanning optical microscopy (1972/1984)
• Multiphoton microscopy (1990)• 4‐Pi microscopy / I5M (1991‐1995)• Structured illumination microscopy (2000)• Negative refractive index (2006)
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Near‐field scanning optical microscopy
Excitation light
Optical fiber
Aperture
Sample Ianoul et al., 2005
β2 adrenergic receptor clusters on the plasma membrane
~ 50 nm
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4‐Pi / I5M
d 2 NA
NA = n sin
Major advantage:Similar z resolution as x‐y resolution
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Patterned illumination
= x
x
Excitation Detection
Detector Detector
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Structured Illumination Microscopy (SIM)
Camera
×
Wide field illumination Diffraction‐limited detection
Diffraction‐limited image
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Wide field illumination
Structured Illumination Microscopy (SIM)
Structured illumination Diffraction‐limited detection
×
Diffraction‐limited imageDoubled resolution
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Structured Illumination Microscopy (SIM)Multiple angles and phases
Reconstruction
WF SIM
Gustafsson, J Microscopy 2000
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The diffraction limit still exists
NAd
221
Confocal
4Pi / I5M
SIM
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Breaking the diffraction barrier
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Confocal
4Pi / I5M
SIM
Breaking the diffraction barrier
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Stim
ulated
Em
ission
Stimulated Emission Depletion (STED)
Send to a dark state
Detector
h
2h
Excitatio
n
Fluo
rescen
ce
sSTED IIFLFL
/10
FL0
0Is
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STED microscopy
ExcitationFluorescence
StimulatedEmission
÷ =
Excitation STEDpattern
EffectivePSF
Hell 1994, Hell 2000
Detector
Excitation
Depletion
Light modulator
?
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Saturated depletion
ISTED = ISISTED = 2 ISISTED = 10 ISISTED = 100 IS
STEDpattern
SaturatedDepletion
zero point
NAIId
s 2/11
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STED images of microtubules
Wildanger et al., 2009
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The “patterned illumination” approach
÷
Excitation Depletionpattern
• Ground state• Triplet state• Isomerizationetc.
=
Multiple cycles
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Saturated SIM
Iex
FLFluorescencesaturation
Saturation level
Saturated illumination pattern
Sharp zero linesGustaffson, PNAS 2005
WF Deconvolution
SIM SSIM
50 nm resolution
Suffers from fast photobleachingunder saturated excitation condition
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The single‐molecule switching approach
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STORM/PALM: Single molecule localizationFluorescence image Underlying structure
FWHM ≈ 320 nm
Single molecule image
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Single‐molecule localization precision
D d / √−N1 photon
10 photons 100 photons 1000 photons
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STORM/PALM: Single molecule localizationFluorescence image Underlying structure
FWHM ≈ 320 nm
Single molecule image
?
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STORM/PALM: Single molecule switchingRaw images STORM Image
2x real time
Activation LocalizationDeactivation
Also named as PALM (Betzig et al., Science, 2006) and FPALM (Hess et al., Biophys. J. 2006)
Rust, Bates & Zhuang, Nat. Methods, 2006Bates, Huang, Dempsey & Zhuang, Science, 2007
Stochastic Optical Reconstruction Microscopy = STORM
Fluorescence image
Photoswitchable molecules
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Photoswitching of red cyanine dyesph
otoactivation
Deactivation
650 nm
360 nm650 nm
Fluorescent
Dark
Cy5 / Alexa 647
NN+
+ thiol
Bates eta l., PRL 2005, Bates et al., Science 2007, Dempsey et al., JACS 2009
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B‐SC‐1 cell, anti‐β tubulin
Commercial secondary antibody
5 μm500 nm
Alexa 647
40,000 frames, 1,502,569 localization points
-80-40
040
80
0
50
100
150
-80-40
040
80
Num
ber o
f poi
nts
y (nm
)x (nm)
FWHM = 24 nmstdev = 10 nm
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The “single‐molecule switching” approach
Multiple photons
• Photoswitching• Blinking• Diffusion• Bindingetc.
+ StochasticSwitching =
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Photoswitchable probes readily available400 500 600 700 nm
Cyanine dye + thiol systemCy5
Cy5.5 Cy7
Rhodamine dye + redox system
Atto590
Alexa568
Atto655 Atto700Alexa488
Heilemann et al., 2009, Dempsey et al., 2012
Atto565
Bates et al., 2005, Bates et al., 2007, Huang et al., 2008
Photoactivatible fluorescent proteins
PA‐GFP
PS‐CFP2
Dronpa
mEosFP2
Dendra2
EYFPReviews:
Lukyanov et al., Nat. Rev. Cell Biol., 2005Lippincott‐Schwartz et al., Trends Cell Biol., 2009
Alexa532
Atto520
PAmCherry
Alexa647
PAtagRFP
Dreiklang
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In a 2D world…Satellite image of ???
Google maps
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3D SIM
Schermellech et al., Science 2008, Gustafsson et al., Biophys J. 2008
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3D STED
Harke et al., Nano Lett, 2008
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3D STORM/PALM
EMCCD
(x, y, z)
4002000‐200‐400z (nm)
(x, y)Astigmatic imaging
Huang et al., Science 2008
Bi‐plane imaging
Double‐helical PSFJuette et al., Science 2008
EMCCD
SLM
14006000‐500‐900z (nm)Pavani et al., PNAS 2009
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5 μm
Huang, Wang, Bates and Zhuang,Science, 2008
Scale bar: 200 nm
3D Imaging of the microtubule networkz (nm)
300
0
600
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I5S
isoSTED
iPALM
4Pi scheme
The use of two opposing objectives
Near isotropic3D resolution
Shal et al., Biophys J 2008
Schmidt et al., Nano Lett 2009
Shtengel et al., PNAS 2009
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3D resolution of super‐resolution methods
x‐y (nm)
z (nm)
Opposing objectives (nm) Two‐photon
Conventional 250 600 4Pi: 120
SIM 100 250 I5S: 120 xyz
STED ~30 ~100 isoSTED: 30 xyz 100 µm deep
STORM/PALM 20‐30 50‐60 iPALM: 20 xy, 10 z
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Multi‐color Imaging
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Multicolor SIMSame as conventional fluorescence microscopy!
Schermelleh et al., Science 2008
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Excitation 2
STED 2
Muticolor STED
Excitation
STED2 color isoSTED resolving
the inner and outer membraneof mitochondria
Schmidt et al., Nat Methods 2008
1 µm
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Multicolor STORM/PALM
mEosFP2 Alexa647
561 nm 642 nm
635DRLPXR
575 nm 675 nm
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mEos2‐tubulinAlexa 647 anti‐β tubulinDrosophila S2 cells
2 µm
Daichi Kamiyama
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Alexa 647 – anti β tubulin
mEos2 tubulinDaichi Kamiyama
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Multicolor STORM/PALM: Emission
n1 n2
n1 = n2 50% SRA545 + 50% SRA617? 100% SRA577?
Single‐molecule detection!
3‐color imaging with one excitation wavelengthand two detection channels
Bossi et al., Nano Lett 2008
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Multicolor STORM/PALM: activation
photoactivation
Deactivation
650 nm
360 nm650 nm
Fluorescent
Dark
Cy5
Cy5
Cy3
Cy3532 nm
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1 μm
Bates, Huang, Dempsey and Zhuang,Science, 2007
█ Cy3 / Alexa 647: Clathrin
█ Cy2 / Alexa 647: Microtubule
Crosstalk subtracted
Laser sequence
457
532 ……
Cy3 A647 Cy2 A647
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Multicolor imaging
Multicolor capability
ConventionalSIM 4 colors in the visible range
STED 2 colors so far
STORM/PALM 3 activation x 3 emission
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Live Cell Imaging
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SIM
STORM/PALM
STED
2 µmKner, Chhun et al., Nat Methods, 2009
Nagerl et al., PNAS, 2008
Schroff et al., Nat Methods, 2008
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The limit of “Super‐Resolution”
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Unbound theoretical resolution
• STORM/PALM– 6,000 photons 5 nm– 100,000 photos during Cy5 life time < 1 nm
• STED– 1:100 contrast of the donut 20 nm– Diamond defects: 8 nm
NAd
2S1
NS =
1+ I/IsS =
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Effective resolution: Probe matters
100 nm
Antibodies: ~ 10 nm
Measured FWHM by antibody: 58 nm
Actual microtubule diameter: 25 nm
Small fluorophores: ~ 1 nm
100 nm
Fluorescent Proteins:~ 3 nm
< 1000 photons ~ 6000 photons~ 6000 photons
100 nm
Measured FWHM by antibody: 58 nm
Actual microtubule diameter: 25 nm
Measured FWHM by FP: 43 nm
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Fluorescent protein vs. Antibody
Fluorescent protein fusion
• Live sample labeling
• High specificity
• High labeling efficiency
• Genetically encoded
• Lower S/N
• Multicolor imaging so far challenging
Antibody immunofluorescence
• Fixed sample
• Potential nonspecific labeling
• Lower labeling efficiency
• Labeling endogenous proteins
• High signal = high localization precision
• More versatile for multicolor imaging
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Effective resolution: Density mattersFrames for image reconstruction:
200 500 1,000 5,000 40,000
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Effective resolution: Density mattersFrames for image reconstruction:
200 500 1,000 5,000 40,000
Point to point distance ≈ Feature size
Nyquist criteria
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Effective resolution: Density mattersFrames for image reconstruction:
200 500 1,000 5,000 40,000
Point to point distance < ½ Feature size
This labeling density limit of resolution applies to all fluorescence microscopy methods
Nyquist criteria
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Live cell STORM/PALM
1 µm
mEos2 labeled microtubule in live S2 cells
60 frames/sec1200 frames/step (20 sec time resolution)
50x real time
Camera im
age fram
es
Time step 4
Time step 3
Time step 2
Time step 1
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Live cell imaging of plasma membrane
1000 frames, 10 sec total time
DiD stained plasma membrane
1 μm
Diameter: 62 nm120 frames / sec, 3000 frames (25 sec)100x real time3 mMmercaptoethylamine
1 μm
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Spatial‐temporal resolution trade‐off
Assuming: 1 molecule occupies 500 × 500 nm
↓On average 0.1 point / 0.25 µm2∙frame
↓70 nm resolu on ≡ 2000 frames
↓100 fps = 20 sec time resolution
FWHM ≈ 320 nm
2 points
1000 fps
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Comparison of time resolution
2D Spatial resolution Time resolution
SIM Wide‐field 120 nm 9 frames (0.09 sec)
STED Scanning 60 nm 1 x 2 µm: 0.03 sec10 x 20 µm: 3 sec
STORM/PALM Wide‐field 60 nm 3000 frames (3 sec)
3D Spatial resolution Time resolution
SIM Wide‐field 120 nm 15 frames x 10 (1.5 sec)
STED Scanning 60 nm 1 x 2 x 0.6 µm: 0.6 sec10 x 20 x 0.6 µm: 60 sec
STORM/PALM Wide‐field 60 nm 3000 frames (3 sec) – no scan!
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Useful review articles• B. Huang, H. Babcock, X. Zhuang, “Breaking the diffraction barrier: super‐
resolution imaging of cells”, Cell, 143, 1047‐1058 (2010).• S. Hell, "Microscopy and its focal switch", Nat. Methods, 6, 24‐32 (2009).• B. Huang, M. Bates, X. Zhuang, “Super resolution fluorescence microscopy”, Ann.
Rev. Biochem., 17, 993‐1016 (2009).• S. Hell, "Far‐field optical nanoscopy", Science, 316, 1153‐1158 (2007).• R. Heintzmann, M. G. L. Gustafsson, "Subdiffraction resolution in continuous
samples", Nat. Photonics, 3, 362‐364 (2009).• B. Huang, “Super resolution optical microscopy: multiple choices”, Curr. Opin.
Chem. Biol.,14, 10‐14 (2010).• M. Fernandez‐Suarez, A. Y. Ting, "Fluorescent probes for super‐resolution imaging
in living cells. Nat. Rev. Mol. Cell Biol., 9, 929‐943 (2008).• J. Lippincott‐Schwartz, G.H. Patterson, "Photoactivatible fluorescent proteins for
diffraction‐limited and super‐resolution imaging", Trends in Cell Biology, 19, 555‐565 (2009).