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Chalek K, Soni A, Lorenz CD, Holland GP. Proline-Tyrosine Ring Interactions in Black Widow Dragline Silk Revealed by Solid-State Nuclear Magnetic Resonance and Molecular Dynamics Simulations. Biomacromolecules 2024; 25:1916-1922. [PMID: 38315982 DOI: 10.1021/acs.biomac.3c01351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Selective one-dimensional 13C-13C spin-diffusion solid-state nuclear magnetic resonance (SSNMR) provides evidence for CH/π ring packing interactions between Pro and Tyr residues in 13C-enriched Latrodectus hesperus dragline silk. The secondary structure of Pro-containing motifs in dragline spider silks consistently points to an elastin-like type II β-turn conformation based on 13C chemical shift analysis. 13C-13C spin diffusion measurements as a function of mixing times allow for the measurement of spatial proximity between the Pro and Tyr rings to be ∼0.5-1 nm, supporting strong Pro-Tyr ring interactions that likely occur through a CH/π mechanism. These results are supported by molecular dynamics (MD) simulations and analysis and reveals new insights into the secondary structure and Pro-Tyr ring stacking interactions for one of nature's toughest biomaterials.
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Affiliation(s)
- Kevin Chalek
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92181-1030, United States
| | - Ashana Soni
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92181-1030, United States
| | - Christian D Lorenz
- Biological Physics & Soft Matter Group, Department of Physics, King's College London, London WC2R 2LS, United Kingdom
| | - Gregory P Holland
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92181-1030, United States
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Rachkov AG, Chalek K, Yin H, Xu M, Holland GP, Schimpf AM. Redox Chemistries for Vacancy Modulation in Plasmonic Copper Phosphide Nanocrystals. ACS Nano 2024. [PMID: 38324804 PMCID: PMC10883034 DOI: 10.1021/acsnano.3c08962] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/09/2024]
Abstract
Copper phosphide (Cu3-xP) nanocrystals are promising materials for nanoplasmonics due to their substoichiometric composition, enabling the generation and stabilization of excess delocalized holes and leading to localized surface plasmon resonance (LSPR) absorption in the near-IR. We present three Cu-coupled redox chemistries that allow postsynthetic modulation of the delocalized hole concentrations and corresponding LSPR absorption in colloidal Cu3-xP nanocrystals. Changes in the structural, optical, and compositional properties are evaluated by powder X-ray diffraction, electronic absorption spectroscopy, 31P magic-angle spinning solid-state nuclear magnetic resonance spectroscopy, and elemental analysis. The redox chemistries presented herein can be used to access nanocrystals with LSPR energies of 660-890 meV, a larger range than has been possible through synthetic tuning alone. In addition to utilizing previously reported redox chemistries used for copper chalcogenide nanocrystals, we show that the largest structural and LSPR modulation is achieved using a divalent metal halide and trioctylphosphine. Specifically, nanocrystals treated with zinc iodide and trioctylphosphine have the smallest unit-cell volume (295.2 Å3) reported for P63cm Cu3-xP, indicating more Cu vacancies than have been previously observed. Overall, these redox chemistries present valuable insight into controlling the optical and structural properties of Cu3-xP.
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Affiliation(s)
- Alexander G Rachkov
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Kevin Chalek
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182, United States
| | - Hang Yin
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
| | - Mingjie Xu
- Irvine Materials Research Institute (IMRI) University of California, Irvine, California 92697, United States
| | - Gregory P Holland
- Department of Chemistry and Biochemistry, San Diego State University, San Diego, California 92182, United States
| | - Alina M Schimpf
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, California 92093, United States
- Program in Materials Science and Engineering, University of California, San Diego, La Jolla, California 92093, United States
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Stengel D, Saric M, Johnson HR, Schiller T, Diehl J, Chalek K, Onofrei D, Scheibel T, Holland GP. Tyrosine's Unique Role in the Hierarchical Assembly of Recombinant Spider Silk Proteins: From Spinning Dope to Fibers. Biomacromolecules 2023; 24:1463-1474. [PMID: 36791420 DOI: 10.1021/acs.biomac.2c01467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
Abstract
Producing recombinant spider silk fibers that exhibit mechanical properties approaching native spider silk is highly dependent on the constitution of the spinning dope. Previously published work has shown that recombinant spider silk fibers spun from dopes with phosphate-induced pre-assembly (biomimetic dopes) display a toughness approaching native spider silks far exceeding the mechanical properties of fibers spun from dopes without pre-assembly (classical dopes). Dynamic light scattering experiments comparing the two dopes reveal that biomimetic dope displays a systematic increase in assembly size over time, while light microscopy indicates liquid-liquid-phase separation (LLPS) as evidenced by the formation of micron-scale liquid droplets. Solution nuclear magnetic resonance (NMR) shows that the structural state in classical and biomimetic dopes displays a general random coil conformation in both cases; however, some subtle but distinct differences are observed, including a more ordered state for the biomimetic dope and small chemical shift perturbations indicating differences in hydrogen bonding of the protein in the different dopes with notable changes occurring for Tyr residues. Solid-state NMR demonstrates that the final wet-spun fibers from the two dopes display no structural differences of the poly(Ala) stretches, but biomimetic fibers display a significant difference in Tyr ring packing in non-β-sheet, disordered helical domains that can be traced back to differences in dope preparations. It is concluded that phosphate pre-orders the recombinant silk protein in biomimetic dopes resulting in LLPS and fibers that exhibit vastly improved toughness that could be due to aromatic ring packing differences in non-β-sheet domains that contain Tyr.
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Affiliation(s)
- Dillan Stengel
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Dr, San Diego, California 92182-1030, United States
| | - Merisa Saric
- Lehrstuhl Biomaterialien, Fakultät für Ingenieurwissenschaften, Universität Bayreuth, Prof.-Rüdiger-Bormann-Street 1, Bayreuth 95447, Germany
| | - Hannah R Johnson
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Dr, San Diego, California 92182-1030, United States
| | - Tim Schiller
- Lehrstuhl Biomaterialien, Fakultät für Ingenieurwissenschaften, Universität Bayreuth, Prof.-Rüdiger-Bormann-Street 1, Bayreuth 95447, Germany
| | - Johannes Diehl
- Lehrstuhl Biomaterialien, Fakultät für Ingenieurwissenschaften, Universität Bayreuth, Prof.-Rüdiger-Bormann-Street 1, Bayreuth 95447, Germany
| | - Kevin Chalek
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Dr, San Diego, California 92182-1030, United States
| | - David Onofrei
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Dr, San Diego, California 92182-1030, United States
| | - Thomas Scheibel
- Lehrstuhl Biomaterialien, Fakultät für Ingenieurwissenschaften, Universität Bayreuth, Prof.-Rüdiger-Bormann-Street 1, Bayreuth 95447, Germany
| | - Gregory P Holland
- Department of Chemistry and Biochemistry, San Diego State University, 5500 Campanile Dr, San Diego, California 92182-1030, United States
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Morimoto K, Kitagawa D, Tong F, Chalek K, Mueller LJ, Bardeen CJ, Kobatake S. Inside Back Cover: Correlating Reaction Dynamics and Size Change during the Photomechanical Transformation of 9‐Methylanthracene Single Crystals (Angew. Chem. Int. Ed. 2/2022). Angew Chem Int Ed Engl 2022. [DOI: 10.1002/anie.202116140] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kohei Morimoto
- Department of Applied Chemistry Graduate School of Engineering Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan
| | - Daichi Kitagawa
- Department of Applied Chemistry Graduate School of Engineering Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan
| | - Fei Tong
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
- Present address: Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry Institute of Fine Chemicals School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China
| | - Kevin Chalek
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
| | - Leonard J. Mueller
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
| | - Christopher J. Bardeen
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
| | - Seiya Kobatake
- Department of Applied Chemistry Graduate School of Engineering Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan
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Morimoto K, Kitagawa D, Tong F, Chalek K, Mueller LJ, Bardeen CJ, Kobatake S. Correlating Reaction Dynamics and Size Change during the Photomechanical Transformation of 9‐Methylanthracene Single Crystals. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202114089] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kohei Morimoto
- Department of Applied Chemistry Graduate School of Engineering Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan
| | - Daichi Kitagawa
- Department of Applied Chemistry Graduate School of Engineering Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan
| | - Fei Tong
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
- Present address: Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering Feringa Nobel Prize Scientist Joint Research Center Frontiers Science Center for Materiobiology and Dynamic Chemistry Institute of Fine Chemicals School of Chemistry and Molecular Engineering East China University of Science and Technology Shanghai 200237 China
| | - Kevin Chalek
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
| | - Leonard J. Mueller
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
| | - Christopher J. Bardeen
- Department of Chemistry University of California, Riverside 501 Big Springs Road Riverside CA 92521 USA
| | - Seiya Kobatake
- Department of Applied Chemistry Graduate School of Engineering Osaka City University 3-3-138 Sugimoto, Sumiyoshi-ku Osaka 558-8585 Japan
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Morimoto K, Kitagawa D, Tong F, Chalek K, Mueller LJ, Bardeen CJ, Kobatake S. Correlating Reaction Dynamics and Size Change during the Photomechanical Transformation of 9-Methylanthracene Single Crystals. Angew Chem Int Ed Engl 2021; 61:e202114089. [PMID: 34761506 DOI: 10.1002/anie.202114089] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2021] [Indexed: 01/16/2023]
Abstract
Photomechanical molecular crystals that expand under illumination could potentially be used as photon-powered actuators. In this study, we find that the use of high-quality single crystals of 9-methylanthracene (9MA) leads to more homogeneous reaction kinetics than that previously seen for polycrystalline samples, presumably due to a lower concentration of defects. Furthermore, simultaneous observation of absorbance and shape changes in single crystals revealed that the dimensional change mirrors the reaction progress, resulting in a smooth expansion of 7 % along the c-axis that is linearly correlated with reaction progress. The same expansion dynamics are highly reproducible across different single crystal samples. Organic single crystals exhibit well-defined linear expansions during 100 % photoconversion, suggesting that this class of solid-state phase change material could be used for actuation.
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Affiliation(s)
- Kohei Morimoto
- Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Daichi Kitagawa
- Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
| | - Fei Tong
- Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521, USA.,Present address: Key Laboratory for Advanced Materials and Joint International Research Laboratory of Precision Chemistry and Molecular Engineering, Feringa Nobel Prize Scientist Joint Research Center, Frontiers Science Center for Materiobiology and Dynamic Chemistry, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Kevin Chalek
- Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521, USA
| | - Leonard J Mueller
- Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521, USA
| | - Christopher J Bardeen
- Department of Chemistry, University of California, Riverside, 501 Big Springs Road, Riverside, CA, 92521, USA
| | - Seiya Kobatake
- Department of Applied Chemistry, Graduate School of Engineering, Osaka City University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan
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