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1. Au133(SPh-tBu)52 Nanomolecules: X-ray Crystallography, Optical, Electrochemical, and Theoretical Analysis

Author:
Zuo, Xiaobing,   et al.   ; Dass, Amala; Theivendran, Shevanuja; Nimmala, Praneeth Reddy; Kumara, Chanaka; Jupally, Vijay Reddy; Fortunelli, Alessandro; Sementa, Luca; Barcaro, Giovanni; Noll, Bruce C.;     Show all 10 Authors
Source:
Journal of the American Chemical Society 2015 v.137 no.14 pp. 4610-4613
ISSN:
1520-5126
Subject:
X-radiation; X-ray diffraction; crystal structure; electrochemistry; electrospray ionization mass spectrometry; gold; ligands; nanomaterials; surface plasmon resonance
Abstract:
... Crystal structure determination has revolutionized modern science in biology, chemistry, and physics. However, the difficulty in obtaining periodic crystal lattices which are needed for X-ray crystal analysis has hindered the determination of atomic structure in nanomaterials, known as the “nanostructure problem”. Here, by using rigid and bulky ligands, we have overcome this limitation and success ...
DOI:
10.1021/ja513152h

2. Exploring the Programmable Assembly of a Polyoxometalate–Organic Hybrid via Metal Ion Coordination

Author:
Zuo, Xiaobing,   et al.   ; Yin, Panchao; Li, Tao; Forgan, Ross S.; Lydon, Claire; Zheng, Zhaoxiong Norm; Lee, Byeongdu; Long, Deliang; Cronin, Leroy; Liu, Tianbo;     Show all 10 Authors
Source:
Journal of the American Chemical Society 2013 v.135 no.36 pp. 13425-13432
ISSN:
1520-5126
Subject:
EDTA (chelating agent); cations; dimethyl sulfoxide; hybrids; light scattering; metal ions; nuclear magnetic resonance spectroscopy; zinc
Abstract:
... The conformational flexibility and programmed assembly of a dumbbell-shaped polyoxometalate–organic hybrid molecule comprising two Dawson-type polyoxometalates linked by a 2,2′-bipyridine unit, which can be coordinate to metal ions, in this case of Zn²⁺, are described. SAXS, UV/vis, and NMR spectroscopic techniques confirm that the hybrid molecules exist as the trans dumbbell in metal-ion-free sol ...
DOI:
10.1021/ja404777g

3. Native State Volume Fluctuations in Proteins as a Mechanism for Dynamic Allostery

Author:
Zuo, Xiaobing,   et al.   ; Law, Anthony B.; Sapienza, Paul J.; Zhang, Jun; Petit, Chad M.;     Show all 5 Authors
Source:
Journal of the American Chemical Society 2017 v.139 no.10 pp. 3599-3602
ISSN:
1520-5126
Subject:
entropy; models; protein structure; proteins
Abstract:
... Allostery enables tight regulation of protein function in the cellular environment. Although existing models of allostery are firmly rooted in the current structure–function paradigm, the mechanistic basis for allostery in the absence of structural change remains unclear. In this study, we show that a typical globular protein is able to undergo significant changes in volume under native conditions ...
DOI:
10.1021/jacs.6b12058

4. Rational Design of Helical Nanotubes from Self-Assembly of Coiled-Coil Lock Washers

Author:
Zuo, Xiaobing,   et al.   ; Xu, Chunfu; Liu, Rui; Mehta, Anil K.; Guerrero-Ferreira, Ricardo C.; Wright, Elizabeth R.; Dunin-Horkawicz, Stanislaw; Morris, Kyle; Serpell, Louise C.; Wall, Joseph S.; Conticello, Vincent P.;     Show all 11 Authors
Source:
Journal of the American Chemical Society 2013 v.135 no.41 pp. 15565-15578
ISSN:
1520-5126
Subject:
amino acid sequences; binding capacity; crystal structure; fluorescence; fluorescent dyes; mutagenesis; nanotubes
Abstract:
... Design of a structurally defined helical assembly is described that involves recoding of the amino acid sequence of peptide GCN4-pAA. In solution and the crystalline state, GCN4-pAA adopts a 7-helix bundle structure that resembles a supramolecular lock washer. Structurally informed mutagenesis of the sequence of GCN4-pAA afforded peptide 7HSAP1, which undergoes self-association into a nanotube via ...
DOI:
10.1021/ja4074529

5. Rational Design of Multilayer Collagen Nanosheets with Compositional and Structural Control

Author:
Zuo, Xiaobing,   et al.   ; Jiang, Tao; Vail, Owen A.; Jiang, Zhigang; Conticello, Vincent P.;     Show all 5 Authors
Source:
Journal of the American Chemical Society 2015 v.137 no.24 pp. 7793-7802
ISSN:
1520-5126
Subject:
calcium; collagen; electrostatic interactions; image analysis; microscopy; nanoparticles; nanosheets; peptides; zeta potential
Abstract:
... Two collagen-mimetic peptides, CP⁺ and CP–, are reported in which the sequences comprise a multiblock architecture having positively charged N-terminal (Pro-Arg-Gly)₃ and negatively charged C-terminal (Glu-Hyp-Gly)₃ triad extensions, respectively. CP⁺ rapidly self-associates into positively charged nanosheets based on a monolayer structure. In contrast, CP– self-assembles to form negatively charge ...
DOI:
10.1021/jacs.5b03326

6. Relationship between Interchain Interaction, Exciton Delocalization, and Charge Separation in Low-Bandgap Copolymer Blends

Author:
Zuo, Xiaobing,   et al.   ; Guo, Zhi; Lee, Doyun; Schaller, Richard D.; Lee, Byeongdu; Luo, TengFei; Gao, Haifeng; Huang, Libai;     Show all 8 Authors
Source:
Journal of the American Chemical Society 2014 v.136 no.28 pp. 10024-10032
ISSN:
1520-5126
Subject:
composite polymers; crystal structure; energy; photovoltaic cells; spectroscopy
Abstract:
... We present a systematic study of the roles of crystallinity, interchain interaction, and exciton delocalization on ultrafast charge separation pathways in donor–acceptor copoloymer blends. We characterize the energy levels, excited state structures, and dynamics of the interchain species by combined ultrafast spectroscopy and computational quantum chemistry approaches. The alkyl side chain of a hi ...
DOI:
10.1021/ja503465s

7. Self-Assembly of an α-Helical Peptide into a Crystalline Two-Dimensional Nanoporous Framework

Author:
Zuo, Xiaobing,   et al.   ; Magnotti, Elizabeth L.; Hughes, Spencer A.; Dillard, Rebecca S.; Wang, Shengyuan; Hough, Lillian; Karumbamkandathil, Arshad; Lian, Tianquan; Wall, Joseph S.; Wright, Elizabeth R.; Conticello, Vincent P.;     Show all 11 Authors
Source:
Journal of the American Chemical Society 2016 v.138 no.50 pp. 16274-16282
ISSN:
1520-5126
Subject:
amino acid sequences; models; nanofibers; nanopores; nanosheets; nanotubes; peptides; transmission electron microscopy
Abstract:
... Sequence-specific peptides have been demonstrated to self-assemble into structurally defined nanoscale objects including nanofibers, nanotubes, and nanosheets. The latter structures display significant promise for the construction of hybrid materials for functional devices due to their extended planar geometry. Realization of this objective necessitates the ability to control the structural featur ...
DOI:
10.1021/jacs.6b06592

8. Self-Recognition of Structurally Identical, Rod-Shaped Macroions with Different Central Metal Atoms during Their Assembly Process

Author:
Zuo, Xiaobing,   et al.   ; Yin, Panchao; Zhang, Jin; Li, Tao; Hao, Jian; Warner, Anna Marie; Chattopadhyay, Soma; Shibata, Tomohiro; Wei, Yongge; Liu, Tianbo;     Show all 10 Authors
Source:
Journal of the American Chemical Society 2013 v.135 no.11 pp. 4529-4536
ISSN:
1520-5126
Subject:
activation energy; chemical elements; dissociation; electrostatic interactions; encapsulation; energy-dispersive X-ray analysis; transmission electron microscopy
Abstract:
... Two rod-shaped macroanions, ((C₄H₉)₄N)₇[Mo₆O₁₈NC(OCH₂)₃XMo₆O₁₈(OCH₂)₃CNMo₆O₁₈] (X = Mnᴵᴵᴵ (1), Feᴵᴵᴵ (2)), with almost identical charge densities and morphologies except for their different encapsulated central metal atoms were each observed to self-assemble into “blackberry”-type supramolecular structures in their dilute solution, driven by the counterion-mediated attraction. Amazingly, the two m ...
DOI:
10.1021/ja400656j

9. Structurally Defined Nanoscale Sheets from Self-Assembly of Collagen-Mimetic Peptides

Author:
Zuo, Xiaobing,   et al.   ; Jiang, Tao; Xu, Chunfu; Liu, Yang; Liu, Zheng; Wall, Joseph S.; Lian, Tianquan; Salaita, Khalid; Ni, Chaoying; Pochan, Darrin; Conticello, Vincent P.;     Show all 11 Authors
Source:
Journal of the American Chemical Society 2014 v.136 no.11 pp. 4300-4308
ISSN:
1520-5126
Subject:
collagen; electrostatic interactions; nanosheets; peptides
Abstract:
... We report the design of two collagen-mimetic peptide sequences, NSI and NSII, that self-assemble into structurally defined nanoscale sheets. The underlying structure of these nanosheets can be understood in terms of the layered packing of collagen triple helices in two dimensions. These nanosheet assemblies represent a novel morphology for collagen-based materials, which, on the basis of their def ...
DOI:
10.1021/ja412867z

10. Structurally Ordered Nanowire Formation from Co-Assembly of DNA Origami and Collagen-Mimetic Peptides

Author:
Zuo, Xiaobing,   et al.   ; Jiang, Tao; Meyer, Travis A.; Modlin, Charles; Conticello, Vincent P.; Ke, Yonggang;     Show all 6 Authors
Source:
Journal of the American Chemical Society 2017 v.139 no.40 pp. 14025-14028
ISSN:
1520-5126
Subject:
DNA; biomimetic materials; nanosheets; nanowires; peptides; periodicity; physical properties
Abstract:
... We describe the co-assembly of two different building units: collagen-mimetic peptides and DNA origami. Two peptides CP⁺⁺ and sCP⁺⁺ are designed with a sequence comprising a central block (Pro-Hyp-Gly) and two positively charged domains (Pro-Arg-Gly) at both N- and C-termini. Co-assembly of peptides and DNA origami two-layer (TL) nanosheets affords the formation of one-dimensional nanowires with r ...
DOI:
10.1021/jacs.7b08087

11. Super-Stable, Highly Monodisperse Plasmonic Faradaurate-500 Nanocrystals with 500 Gold Atoms: Au∼500(SR)∼120

Author:
Zuo, Xiaobing,   et al.   ; Kumara, Chanaka; Ilavsky, Jan; Chapman, Karena W.; Cullen, David A.; Dass, Amala;     Show all 6 Authors
Source:
Journal of the American Chemical Society 2014 v.136 no.20 pp. 7410-7417
ISSN:
1520-5126
Subject:
X-radiation; gold; mass spectrometry; nanocrystals; nanogold; nanoparticles; transmission electron microscopy
Abstract:
... Determining the composition of plasmonic nanoparticles is challenging due to a lack of tools to accurately quantify the number of atoms within the particle. Mass spectrometry plays a significant role in determining the nanoparticle composition at the atomic level. Significant progress has been made in understanding ultrasmall gold nanoparticles such as Au₂₅(SR)₁₈ and Au₃₈(SR)₂₄, which have Au core ...
DOI:
10.1021/ja502327a