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AFM Force Spectroscopy and Steered Molecular Dynamics Simulation of Protein Contactin 4

100%

Strzelecki J.

Acta Physica Polonica A

2009

vol. 116

issue S

S-156-S-159

We use a single molecule atomic force spectroscopy combined with the steered molecular dynamics simulation to determine a mechanical behavior of neural cell adhesion protein contactin during its unfolding. Force curves typical for modular proteins were observed, showing at most four unfolding peaks. The analysis of force spectra performed within worm-like chain model of polymer elasticity showed the presence of three unfolding lengths. Small plateaus, most likely resulting from forced transitions within domains were observed for the first time. Steered molecular dynamics simulations help to determine atomistic picture of domain unfolding.

Influence of Plasmon Resonance in Silver Island Film on the Optical Properties of Peridinin-Chlorophyll-Protein Light-Harvesting Complexes

39%

Ciszak K., Olejnik M., Strzelecki J., Krajnik B., Piątkowski D., Hofmann E., Mackowski S.

Acta Physica Polonica A

2012

vol. 122

issue 2

275-278

We study the effect of plasmon excitations in silver island film on the optical properties of peridinin-chlorophyll-protein light-harvesting complex using scanning fluorescence microscopy. With this technique we can unambiguously locate areas where the biomolecules are deposited on the metallic nanostructures from the areas where they stick to the glass surface. The enhancement factor of fluorescence intensity obtained for such a hybrid nanostructure is found to be 3. Plasmon excitations in the SIF layer also influence the dynamics of the emission, but in this case the interpretation of the results is more complex.

AFM Investigation of Biological Nanostructures

39%

Strzelecki J., Dąbrowski M., Strzelecka J., Tszydel M., Mikulska K., Nowak W., Balter A.

Acta Physica Polonica A

2012

vol. 122

issue 2

329-332

Nanostructures created by living organisms, optimized through millions of years of evolution, can be a valuable inspiration for nanotechnology. We employ atomic force microscopy to examine such structures in materials created by common organisms - caddisfly and diatoms. Caddisfly larvae are well known for their ability to spin silk, which serves as an "adhesive tape" to glue various materials and collect food in aqueous environment. Atomic force microscopy imaging of caddisfly silk, performed for the first time by our team, has shown that its surface is patterned with 150 nm extensions - a feature related to its exceptional underwater sticking abilities. Results of force spectroscopy of protein structures found on the surface are also shown. A characteristic feature of diatoms is that they are encased within a unique silica cell wall called frustules, patterned with 200 nm pores, which allow cellular interaction with the environment. We perform atomic force microscopy imaging of frustules in living diatoms as well as adhesion measurements inside pores.

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3 Acta Physica Polonica A

2 2012

1 2009

3 Strzelecki J.

1 Balter A.

1 Ciszak K.

1 Dąbrowski M.

1 Hofmann E.

1 Krajnik B.

1 Mackowski S.

1 Mikulska K.

1 Nowak W.

1 Olejnik M.

1 Piątkowski D.

1 Strzelecka J.

1 Tszydel M.

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AFM Force Spectroscopy and Steered Molecular Dynamics Simulation of Protein Contactin 4

Influence of Plasmon Resonance in Silver Island Film on the Optical Properties of Peridinin-Chlorophyll-Protein Light-Harvesting Complexes

AFM Investigation of Biological Nanostructures