

RESEARCH
Living cells have evolved with intricate protein quality control machinery, that not only ensures formation of functional three-dimensional structure of proteins, but also eliminates the cytotoxic protein aggregates. This quality control mechanism, however, fails to respond in disease conditions like Alzheimer's disease, Parkinson's disease, type-2 diabetes, some types of cancer etc. Many such protein misfolding diseases are associated with the abnormal intercellular communication, where synchronization of overall body function is disrupted. Under the normal condition, this intercellular communication is primarily mediated through the chemical messengers like, hormones, neurotransmitters, proteins etc. Our laboratory aims to understand:
1. Molecular mechanism of intercellular communication, in normal and pathological conditions.

PUBLICATIONS
Peer reviewed journal publications:
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B.R. Bhaskar, L. Yadav, M. Sriram, K. Sanghrajka, M. Gupta, Boby K. V., R. K. Nellikka, & D. Das. Differential SNARE chaperoning by Munc13-1 and Munc18-1 dictates fusion pore fate at the release site. Nature Communications, 2024 May 16;15(1):4132. doi: 10.1038/s41467-024-46965-7.
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S. Patil, K. Sanghrajka, M. Sriram, A. Chakraborty, S. Majumdar, B.R. Bhaskar, & D. Das. Synaptobrevin2 monomers and dimers differentially engage to regulate the functional trans-SNARE assembly. Life Sci Alliance, 2024 Jan 18;7(4):e202402568. doi: 10.26508/lsa.202402568.
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K. C. Courtney, T. Mandal, Y. Li, N. Mehta, D. Das, Q. Cui, & E.R.Chapman. Synaptotagmin 7 outperforms synaptotagmin 1 to promote the formation of large, stable fusion pores via robust membrane penetration. Nature Communications, 2024 Jan 4;15(1):262. doi: 10.1038/s41467-023-44414-5.
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R. K. Nellikka, B. R. Bhaskar, K. Sanghrajka, S. S. Patil, and D. Das. α-Synuclein kinetically regulates the nascent fusion pore dynamics. Proc. Natl. Acad. Sci USA 118 (34) e2021742118; https://doi.org/10.1073/pnas.2021742118 (August 24, 2021).
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D.Das, H. Bao, K. C. Courtney, L. Wu & E.R. Chapman. Resolving kinetic intermediates during the regulated assembly and disassembly of fusion pores. Nature Communications, 2020 11, 231.
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H. Bao*,D.Das*, NA Courtney, Y Jiang, J Brigugli, X Lou, D Roston, Q Cui, B Chanda and ER Chapman. Dynamics and number of trans-SNARE complexes determine nascent fusion pore properties. Nature 554, 260–263 (2018). [* equal contribution] [Highlighted Article. US Weekly, Science Daily, Physics.org etc.] (Selected as F1000Prime article: DOI: 10.3410/f.732585766.793543805).
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D.Das & BA Krantz. Peptide and Proton Driven Allosteric Clamps Catalyze Anthrax Toxin Translocation across Membranes. Proc. Natl. Acad. Sci. USA 13(34): 9611-6 (2016).
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D.Das & BA Krantz. Secondary structure preferences of the allosteric clamps in the anthrax toxin protective antigen translocase. J Mol. Biol., 429(5): 753-762 (2017).
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D.Das, D. Samanta, A. Bhattacharya, A. Basu, A. Das, J. Ghosh, A. Chakrabarti & C. Das Gupta. A possible role of the full-length nascent protein in post-translational ribosome recycling. PLoS One 12(1): e0170333 (2017). doi: 10.1371/journal.pone.0170333.
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E. Biondi, J.D. Lane, D.Das, S. Dasgupta, J.A. Piccirilli, S. Hoshika, K.M. Bradley, B.A. Krantz & S.A. Benner. Aptamers Targeting Anthrax Protective Antigen using Laboratory In Vitro Selection with an Expanded Genetic Alphabet. Nucleic Acids Res 44 (20): 9565-9577 (2016).
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K. Ghosal, J.M. Colby, D.Das, S.T. Joy, P.S. Arora, B.A. Krantz. Dynamic Phenylalanine Clamp Interactions Define Single-Channel Polypeptide Translocation through the Anthrax Toxin Protective Antigen Channel. J Mol. Biol. 429(6): 900-910 (2017).
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D.Das, D. Samanta, S. Hasan, A. Das, A. Bhattacharya, S. Dasgupta, A. Chakrabarti, P. Ghorai, & C. Das Gupta. Identical RNA-protein interactions in vivo & in vitro and a scheme of folding the newly synthesized proteins by ribosomes. J. Biol. Chemistry (2012).
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A. Das, J. Ghosh, A. Bhattacharya, D. Samanta, D.Das, C. Das Gupta. Involvement of mitochondrial ribosomal proteins in ribosomal RNA mediated protein folding. J. Biol. Chemistry 286(51): 43771-81 (2011).
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D.Das, D. Samanta, A. Das, J. Ghosh, A. Bhattacharya, A. Basu, A. Chakrabarti, C. Das Gupta. Ribosome: The Structure-Function Relation and a New Paradigm to the Protein Folding Problem. Israel J. of Chemistry (Special Issue to celebrate the Nobel Prize on Ribosome: Ribosome Chemistry) (2010).
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D.Das, A. Das, D. Samanta, J. Ghosh, S. Dasgupta, A. Bhattacharya, A. Basu, S. Sanyal, C. DasGupta. Role of Ribosome in Protein Folding. Biotechnology J. 3(8): 999-1009 (2008).
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A. Basu, D. Samanta, D.Das, S. Chowdhury, A. Bhattacharya, J. Ghosh, A. Das, C. Dasgupta. In vitro protein folding by E. coli ribosome: unfolded protein splitting 70S to interact with 50S subunit. Biochem. Biophys. Res. Commun. 366(2): 598-603 (2008).
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D. Samanta, D. Mukhopadhyay, S. Chowdhury, J. Ghosh, S. Pal, A. Basu, A. Bhattacharya , A. Das, D.Das, C. DasGupta. Protein folding by domain V of Escherichia coli 23S rRNA: specificity of RNA-protein interactions. J. Bacteriology 190(9): 3344-52 (2008).
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A. Basu, D. Samanta, A. Bhattacharya, A. Das, D.Das, C. DasGupta. Protein folding following synthesis in vitro and in vivo: association of newly synthesized protein with 50S subunit of E. coli ribosome. Biochem. Biophys. Res. Commun. 366(2): 592-7 (2008).
Book chapter:
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D. Samanta, A. Das, D.Das, A. Bhattacharya, A. Basu, J. Ghosh, C. DasGupta, Ribosome Assisted Protein Folding: Some of its Biological Implications; Series: Protein Biochemistry, Synthesis, Structure and Cellular Functions; 2010; ISBN: 978-1-61761-259-6, NOVA Publishers.
Funding Agencies






FURTHER READING
Protein synthesis and folding project - related literature:
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Science. 1973 Jul 20;181(4096):223-30.
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Cell. 2014 Mar 27;157(1):52-64. doi: 10.1016/j.cell.2014.03.007.
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Nat Rev Mol Cell Biol. 2008 Mar;9(3):242-53. DOI: 10.1038/nrm2352.
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Annu Rev Biochem. 2006;75:333-66. DOI: 10.1146/annurev.biochem.75.1013 04.123901.
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Annu Rev Biochem. 2017 Jun 20;86:27-68. DOI: 10.1146/annurev-biochem-061516-045115.
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Nat Rev Mol Cell Biol. 2003 Mar;4(3):181-91. DOI: 10.1038/nrm1052
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Nat Struct Mol Biol. 2013 Feb;20(2):237-43. doi: 10.1038/nsmb.2466.
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Mol Cell. 2013 Feb 7;49(3):411-21. doi: 10.1016/j.molcel.2013.01.020.
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Nat Methods. 2018 Mar 15;137:71-81. DOI: 10.1016/j.ymeth.2017.11.007.
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Curr Opin Struct Biol. 2014 Feb;24:24-33. doi: 10.1016/j.sbi.2013.11.004.
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Journal of Physical Organic Chemistry 17(11):901 - 912 · November 2004. https://doi.org/10.1002/poc.831
Black lipid membrane and single channel analysis related literature:
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Nature. volume 194, pages979–980 (1962). 10.1038/194979a0
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J Gen Physiol. 1969 Jun 1; 53(6): 741–757.
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Nature (Lund)H. ladky and Haydon (1970) 255: 451.
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J Gen Physiol. Ehrenstein et al. (1970) 55:119.
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Nature. 1976 Apr 29;260(5554):799-802.
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Pflugers Arch. 1978 Jul 18;375(2):219-28.
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Methods in Enzymology, Volumes 207, 293 and 294 – Each text is dedicated to ion channel technology (207 is the best).
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Ion Channel Reconstitution, by Chris Miller (1976) Plenum Press.
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Ion Channels of Excitable Membranes (3rd Ed), by Bertil Hille (2001) Sinauer Associates.
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Single-Channel Recording, by Sakman and Neher (1995) Plenum
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Biological Techniques: Planar Lipid Bilayers, Methods and Applications, by Hanke and Schlue (1993) Academic Press
SNAREs, fusion pore and regulatory factors related literature:
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Nature. 1994 Jul 21;370(6486):191-3.
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Nature. 1993 Mar 25;362(6418):318-24.
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Cell. 1998 Mar 20;92(6):759-72.
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Nature. 2000 Sep 14;407(6801):153-9.
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Science. 2009 Jan 23;323(5913):474-7. doi: 10.1126/science.1161748.
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Proc R Soc Lond B Biol Sci. 1973 Jul 3;183(1073):421-5.
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Nature. 1987 Aug 27-Sep 2;328(6133):814-7.
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Curr Opin Cell Biol. 1995 Aug;7(4):509-17.
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J Gen Physiol. 2017 Mar 6;149(3):301-322. doi: 10.1085/jgp.201611724.
MEMBERS

Principal Investigator
Dr. Debasis Das
Debasis Das is currently a Reader at Department of Biological Sciences, Tata Institute of Fundamental Research, Mumbai. He recieved his doctoral training with Dr. Chanchal K. Dasgupta at University of Calcutta. He went on to pursue a post doctoral fellowship at University of California, Berkeley (2013-2014) and University of Maryland (2014-2016) with Dr. Bryan A. Krantz. He was a research associate with Dr. Edwin R. Chapman at HHMI & University of Wisconsin, Madison (2016-2019) before starting his new lab at TIFR in September 2019.
ALUMNI
Amrita Das
Project Fellow : 2024-2025
Completing her Masters from IISER Mohali
Bhavya Rajasree Bhaskar
PhD Student : 2019--2024
Currently working as post doctoral Fellow at University of Wisconsin-Madison,USA.
Sulekha Bhat
Masters Student : 2019 - 2022
Currently pursuing Biophysics PhD program, University of Wisconsin-Madison, USA.
Muazzama Ansari
Project Fellow : 2024-2025
Completing her Masters from St.Xaviers College, Mumbai
Rohith Kumar Nellikka
Post Doctoral Fellow : 2020-2022
Now has started his own Life Science Training Company
Laxmi Yadav
Junior Research Fellow : 2022-2023
Currently pursuing PhD at University of Vienna, Austria.
Nikita Kore
Project Fellow : 2024-2025
Completing her Masters from G.N.Khalsa college, Mumbai
Swapnali Sarjerao Patil
Masters Student : 2019 - 2022
Currently at the Neuroscience PhD program, University of Wisconsin-Madison, USA
Abrar Momaya
Project fellow: 2021-2022
Currently Young Professional II ICAR- Central Institute of Fisheries Education (CIFE), Mumbai
Poonam Dhiman
Project fellow: 2022
Currently Ph.D. student, Darwin Fellow, University of Edinburgh, UK
Mitsu Rawal
Project fellow: 2020
Currently PhD student at Wesleyan University, USA
Rahul Vishwakarma
Project fellow: 2022
Completed M.Sc., St. Xaviers College Mumbai
Shreya Joshi
Project fellow: 2023
Currently project assistant at BARC
Mikael Varghese
Project fellow: 2020-2021
Currently Product Management Executive for Meril Diagnostics
Bhumi Davda
Project fellow: 2023-2024
Project Research assistant at SCAN , IIT Bombay.
Saurav Gite
Project Student : 2023
Completed his Masters degree from Savitribai Phule University, Pune.
Parvaiz Dar
Post Doctorate fellow: 2022-2023
Currently Assistant Professor at the University of Kashmir,
Dept. of Clinical Biochemistry, India
Mayank Gupta
Masters Student:2021-2023
Currently pursuing PhD at
Technische Universität Dresden,
Germany.
Aritra Chakraborty
Masters Student: 2020-2022
Currently Ph.D. student at the Ashoka University, India
GALLERY
NEWS
26th September 2024
Kinjal presented at the PhD cafe series organised by IndiaBioscience.
5th May 2024
Debasis was awarded the DBT Grant.
19th Dec 2023
Debasis was awarded the EMBO Grant.
11th July 2022
Bhavya won best poster award at International Symposium on Chromaffin Cell Biology, held at Hamburg, Germany.
OPEN POSITIONS
We are actively looking for a researcher with a PhD in Cell biology/Biochemistry/Molecular Biology or any other Life Sciences discipline to do Postdoctoral research in the lab. Interested candidates can directly contact Dr. Debasis Das along with their CV by email.
GET IN TOUCH
Visit Us
Room: B208, Department of Biological Sciences
Tata Institute of Fundamental Research
Homi Bhabha Road, Navy Nagar, Colaba
Mumbai - 400 005
Email ID: debasis.das@tifr.res.in
Telephone no.:022-2278-2984 (Office)
Lab Email ID: ddlab.dbstifr@gmail.com
Telephone no.:022-2278-2186 (Lab)