Peptide Nano Technology

Molecular Self Assembly

Dr. Ramesh Singh

Post Doctoral Fellow
Department of Mechanical Engineering,
Colorado State University, Fort Collins, CO, US.

Post Doctoral Fellow
Department of Biological Engineering,
Indian Institute of Technology Gandhinagar (IITGN), Gandhinagar, Gujrat, India
(2022-23)
PI: Dr Dhiraj Bhatia

PhD (Bio-Organic Chemistry)
Dr. Harisingh Gour Vishwavidyalaya, (A Central University) Sagar, M.P., India (2022)
Supervisor: Dr. Khashti Ballabh Joshi

Graduate Aptitude Test in Engineering  (GATE)-2016 (Conducted by IISc Bangalore)

Joint CSIR-UGC National Eligibility Test (NET) for Junior Research Fellowship (JRF) and Lectureship (LS), 2015

M.Sc. (Organic Chemistry)
M. B. Govt. P. G. College Haldwani, Kumaun University Nainital Uttrakhand, India (2013)

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Research Interest


Bio-molecular self-assembly uses non-covalent forces such as van der Walls forces, hydrophobic interaction, hydrogen bonding, π-π stacking, etc. to facilitate the formation of highly organized and thermodynamically stable nanostructures.

Peptide Nano Technology
I am interested to design and synthesize short peptides conjugate for the fabrication of new fascinating nano-architectures and its manipulation. The ability to create ordered nanostructures by strategically designed or bioinspired peptide self-assembly is a significant tool for resolving the complicated assembly process of natural proteins. These nanoparticles are utilized for various biomedical applications such as antibacterial activity, bioimaging, and drug delivery purpose.

  • Design and synthesis of diverse short peptide conjugates and study their aggregation behaviors.
  • To apply Self-assembly properties of short peptide conjugates in forming soft nanostructured material.
  • Investigate the mechanism of the self-assembly process by applying stimuli such as temperature, pH, metal cations, and by chemical modifications
  • To check the applications of these controlled nanostructures in biotechnology and the biomedical field.

DNA Nanotechnology
Currently, I am working on functionalization of DNA nanomaterial with peptides and other functional ligand.

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Lipid Modification of DNA Tetrahedrons Enhances Cellular Uptake, Migration, and In Vivo Uptake

Ramesh Singh#, Krupa Kansara#, Pankaj Yadav, Abdulkhalik Mansuri, Ashutosh Kumar, Dhiraj Bhatia, ACS Appl. Nano Mater. 2023, 6, 14, 13443–13452. https://doi.org/10.1021/acsanm.3c02029 (#Authors contributed equally)

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Mercury-instructed assembly (MiA): architectingclathrin triskelion-inspired highly functional C3-symmetric triskelion nanotorus functional structures into microtorus structures

K. Kesharwani, R. Singh, N. Kumar, N. Singh, P. Gupta, K. B. Joshi, Nanoscale 2022, 14, 10200–10210. https://doi.org/10.1039/D2NR01524B

We architect a C3-symmetric triskelion “Nanotorus” structures into hierarchic andorganized “Microtorus” structures by using mercury, a toxic metal. Thus in this study wehave demonstrated a unique example of toxic metal instructed assembly for“Nanoarchitectonics” of the formation of microtorus structures, which can be exploited forseveral potential applications ranging from biomedical to nanotechnology.

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A naphthalimide-based peptide conjugate for concurrent imaging and apoptosis induction in cancer cells by utilizing endogenous hydrogen sulfide

R. Singh#, N. Singh#, S. Sharma#,  S. Rajput#, N. Chattopadhyay, D. Tewari, K. B. Joshi, S. Verma, Chem. Sci. 2021, 12, 16085-16091. https://doi.org/10.1039/D1SC04030H (#Authors contributed equally)  


Hydrogen sulfide Sensing Naphthalimide based Peptide conjugate (HSNPc) worked as novel cancer cell imaging agent and showed selective cell apoptosis.

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Biofabrication of Diatom Surface by Tyrosine-Metal Complexes:Smart Microcontainers to Inhibit Bacterial Growth

R. Singh, M. J. Khan, J. Rane, A. Gajbhiye, V. Vinayak, K. B. Joshi,  ChemistrySelect 2020, 5, 3091 –3097. https://doi.org/10.1002/slct.201904248

Facile and effective fabrications of diatom with Tyr- ZnII conjugate lead special class of highly biocompatible diatom-microcontainers. Such microcontainers have superior control for the delivery of toxic metal ions hence provide less physical damage and consequently found responsive against clinically relevant bacteria.

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Self-assembly of a Sequence-shuffled Short Peptide Amphiphile Triggered by Metal Ions into Terraced Nanodome-like Structures

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R. Singh, N. K. Mishra, P. Gupta, K. B. Joshi,  Chem. Asian J. 2020, 15, 531–539. https://doi.org/10.1002/asia.201901715


The fine tuning of aromatic residues of a designed short peptide amphiphile leads to a pair of constitutional isomers. Interestingly, in the presence of copper metal ions, one of the isomer self-assembled into vertically stacked terraced layers with decreasing size that resemble to nanodome-like structures.

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Transition metal ions induced secondary structural transformation in a hydrophobized short peptide amphiphile

R. Singh, N. K. Mishra, N. Singh, P. Rawal, P. Gupta, K. B. Joshi,  New J. Chem. 2020, 44, 9255–9263. https://doi.org/10.1039/D0NJ01501F


Transition metal ions mediated secondary structural transformation of di-phenylalanine based short peptide amphiphile can pave a way to design and develop the stimuli responsive nanomaterials for various plausible applications.

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Gold-Ions-Mediated Diproline Peptide Nanocarpets and Their Inhibition of Bacterial Growth

R. Singh, V. Suryavashi, V. Vinayak, K. B. Joshi, ChemistrySelect 2019, 4, 5810-5816. https://doi.org/10.1002/slct.201900847


Structurally constraints Pro-Pro dipeptide in the presence of Gold ion self assembled into multi-shaped sheet like structures. These hybrid structures worked as toxic metal ions reservoirs and platform to target bacterial membrane therefore have shown great potential to treat the bacterial infections.

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Ornamentation of Triskelion Peptide Nanotori to Produce Gold Nanoparticle (AuNP)-Embedded Peptide Nanobangles

R. Singh#, S. Gupta#, V. Kumar, P. Shukla, K. B. Joshi, Chem. Asian J. 2018, 13, 3285–3295. https://doi.org/10.1002/asia.201801270 (#Authors contributed equally)

As good as gold: We report the formation of gold nanoparticle (AuNP)–biotinylated triskelion peptide hybrid nanostructures by using self-organization and mimicking strategies to develop AuNP-ornamented peptide nanobangles with predetermined properties on biocompatible surfaces.

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Transition Metal Ion–Mediated Tyrosine-Based Short-Peptide Amphiphile Nanostructures Inhibit Bacterial Growth

R. Singh, N. K. Mishra, V. Kumar, V. Vinayak, and K. B. Joshi, ChemBioChem. 2018, 19, 1630-1637. https://doi.org/10.1002/cbic.201800220 Very Important Paper (VIP) Media Cover Chemistry View


Biomolecular switches: A palmitoylated bis-tyrosine-based short-peptide amphiphile (sPA) transforms its morphology in the presence of bioactive transition-metal ions. The metal-ion-conjugated sPA hybrid nanostructures were effective against Gram-positive bacteria. It was found that the designed sPA was greatly taken up by bacteria and therefore acted as a cytotoxic metal ion delivery agent. 

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Biotin–avidin interaction triggers conversion of triskelion peptide nanotori into nanochains

R. Singh#, V. Kumar#,  K. B. Joshi,  New J. Chem. 2018, 42, 3452-3458. https://doi.org/10.1039/C7NJ04248E (#Authors contributed equally)


Triskelion biotinylated peptide get self assembled into robust nanotorus like structures which further lead to nanotorus dimer and chain of nanotorus by using natural principles of receptor- ligand recognitions properties of biotin avidin interaction.

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Hierarchical Self-Assembly of Diproline Peptide into Dumbbells and Copper-Ion-Promoted Robust Discs

R. Singh, S. Gupta, V. Kumar, K. B. Joshi, ChemNanoMat 2017, 3, 620-624. https://doi.org/10.1002/cnma.201700129


The self-assembly of the helix-initiating dipeptide Pro-Pro has been investigated. In the absence of CuII ions the dipeptide self-assembled into micrometer-sized three-dimensional dumbbells. Furthermore, the presence of CuII ions triggered the dumbbells to form into robust 3D radial disc structures, which could be of great interest for several biotechnological applications.

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