# Gourisankar Ghosh
Gourisankar Ghosh is a structural biologist and biochemist who joined the [University of California, San Diego](https://www.edgepedia.org/university-of-california-san-diego) (UCSD) in 1995 and has been a professor in its Department of Chemistry and [Biochemistry](https://www.edgepedia.org/biochemistry) since 2005, and is known for crystal structures of the transcription factor NF-κB and its inhibitor IκBα.[1](https://orcid.org/0000-0001-6311-7351) • [2](https://cshperspectives.cshlp.org/content/1/3/a000075.full) His stated method rests on high-resolution x-ray structures of proteins and protein complexes.[3](https://www-chem2.ucsd.edu/faculty/profiles/ghosh_gourisankar.html)
| Fact | Detail |
|---|---|
| Position | Professor of Chemistry and Biochemistry, UCSD[1](https://orcid.org/0000-0001-6311-7351) |
| Signature work | "Regulation of Protein Kinases", review, Molecular Cell, 2004[4](https://doi.org/10.1016/j.molcel.2004.08.024) |
| Landmark structures | NF-κB p50 homodimer (Nature, 1995, about 2.3 Å); p50/p65 heterodimer bound to DNA (Nature, 1998, about 2.9 Å) |
| Funding | Principal investigator on NIH R01GM085490 (2009–2024) and R21AG072487 (2021–2023)[7](https://profiles.ucsd.edu/gourisankar.ghosh) |
## Education and early career
Ghosh earned a BS at St. Xavier's College in 1983 and an MS at the [University of Calcutta](https://www.edgepedia.org/university-of-calcutta), where ORCID records his biochemistry graduate study from July 1983 to June 1985.[3](https://www-chem2.ucsd.edu/faculty/profiles/ghosh_gourisankar.html) • [1](https://orcid.org/0000-0001-6311-7351) The UCSD departmental profile lists a 1991 PhD and a 1988 MS from [Albert Einstein](https://www.edgepedia.org/albert-einstein).[3](https://www-chem2.ucsd.edu/faculty/profiles/ghosh_gourisankar.html)
The 1995 p50 structure carries a [Howard Hughes Medical Institute](https://www.edgepedia.org/howard-hughes-medical-institute) and Yale Department of Molecular Biophysics and Biochemistry affiliation, placing the work in those laboratories.[5](https://www.nature.com/articles/373303a0) The departmental profile lists the Yale postdoc under appointments with the year 1995, while ORCID gives the 1991–1995 dates.[3](https://www-chem2.ucsd.edu/faculty/profiles/ghosh_gourisankar.html) • [1](https://orcid.org/0000-0001-6311-7351)
## The NF-κB crystal structures
A first-person account of the work records that p50, p65/RelA homodimers, and IκBα resisted crystallization in their free states, and that progress came from concentrating on p50:DNA complexes.[8](https://pmc.ncbi.nlm.nih.gov/articles/PMC4543363/)
**The p50 homodimer structure** was published in Nature in 1995 at 2.3 Å resolution, with the p50 dimer bound to a palindromic κB site.[5](https://www.nature.com/articles/373303a0) It showed that the Rel homology region folds into two distinct domains similar to those of the immunoglobulin superfamily, and that the dimer envelops an undistorted B-DNA helix, contacting the 10-base-pair κB recognition site mainly through loops connecting secondary-structure elements.[5](https://www.nature.com/articles/373303a0) A specialist review records that this structure, together with a second 1995 p50:p50 structure from another group, gave the first glimpse of the Rel homology region and revealed a novel DNA-binding motif in which an entire roughly 300-amino-acid RHR from each subunit contacts one whole turn of the DNA major groove.[2](https://cshperspectives.cshlp.org/content/1/3/a000075.full) The corresponding coordinates, PDB entry 1NFK, were deposited in February 1995 and released in December 1996.[9](https://www.rcsb.org/structure/1NFK)
**The p50/p65 heterodimer structure** followed in Nature in 1998 at 2.9 Å resolution, with the heterodimer bound to the κB DNA of the immunoglobulin light-chain gene intronic enhancer.[6](https://ideas.repec.org/a/nat/nature/v391y1998i6665d10.1038_34956.html) It revealed a 5-base-pair 5′ subsite read by p50 and a 4-base-pair 3′ subsite read by p65, and explained why the p50/p65 heterodimer interface is stronger than that of either homodimer.[6](https://ideas.repec.org/a/nat/nature/v391y1998i6665d10.1038_34956.html)
Ghosh's laboratory extended this structural record to other κB sites: a 2002 [Journal of Biological Chemistry](https://www.edgepedia.org/journal-of-biological-chemistry) paper reported the x-ray structure of the p50/p65 heterodimer bound to the interferon-β κB site,[7](https://profiles.ucsd.edu/gourisankar.ghosh) with a deposited coordinate set at 3.0 Å.[10](https://datamed.org/author/8859911)
## Representative work
His works include the review "Regulation of Protein Kinases", published in Molecular Cell in 2004.[4](https://doi.org/10.1016/j.molcel.2004.08.024) According to the 1995 Nature paper on the NF-κB p50 homodimer structure, the landmark NF-κB structures described above, published in Nature in 1995 and 1998, are the work his field associates him with.[5](https://www.nature.com/articles/373303a0)
## Career at UC San Diego
Ghosh joined UCSD as assistant professor on 1 July 1995, became associate professor on 1 July 2001, and has been professor since 1 July 2005.[1](https://orcid.org/0000-0001-6311-7351) As principal investigator he held NIH R01GM085490 (Cofactor-Mediated DNA Binding by the NF-kappaB Dimers, 2009–2024) and R21AG072487 (The Role of Chromogranin A in Tauopathy, 2021–2023).[7](https://profiles.ucsd.edu/gourisankar.ghosh) Grant records for R01GM085490, funded by NIGMS, show total costs of $310,000 in 2014 and $94,252 in support year 6.[11](https://grantome.com/grant/NIH/R01-GM085490-06S1)
He is one of five group leaders in a UCSD program project on NF-κB/IκB interaction dynamics; within it, his laboratory found that IκBα is degraded very quickly by the 20S proteasome.[12](https://nfkb-ikb.ucsd.edu/)
## Later research
His laboratory has worked on the upstream IKK kinases, leading an EMSL-supported cryo-EM project, "Determination of the structure of IKK signaling complex by cryo-EM"; the IKK complex is about 270 kDa and relays signals from membrane-bound receptors to regulate gene expression for immune signaling.[13](https://www.emsl.pnnl.gov/people/gourisankar-ghosh) A 2020 Department of Energy project record for the same effort lists him as investigator and notes the low quality of the cryo-EM map as a limitation.[14](https://www.osti.gov/award-doi-service/biblio/10.46936/cpcy.proj.2020.51534/60006850)
## References
1. Gourisankar Ghosh (0000-0001-6311-7351), ORCID record. https://orcid.org/0000-0001-6311-7351
2. A Structural Guide to Proteins of the NF-κB Signaling Module. Cold Spring Harbor Perspectives in Biology. https://cshperspectives.cshlp.org/content/1/3/a000075.full
3. Ghosh, Gourisankar, UC San Diego Department of Chemistry and Biochemistry faculty profile. https://www-chem2.ucsd.edu/faculty/profiles/ghosh_gourisankar.html
4. Regulation of Protein Kinases. Molecular Cell, 2004. https://doi.org/10.1016/j.molcel.2004.08.024
5. Structure of NF-κB p50 homodimer bound to a κB site. Nature, 1995. https://www.nature.com/articles/373303a0
6. Crystal structure of p50/p65 heterodimer of transcription factor NF-κB bound to DNA. Nature, 1998. https://ideas.repec.org/a/nat/nature/v391y1998i6665d10.1038_34956.html
7. Gourisankar Ghosh, UCSD Profiles. https://profiles.ucsd.edu/gourisankar.ghosh
8. NF-κB Regulation: Lessons from Structures. PMC. https://pmc.ncbi.nlm.nih.gov/articles/PMC4543363/
9. RCSB PDB entry 1NFK. https://www.rcsb.org/structure/1NFK
10. DataMed, G Ghosh structural depositions. https://datamed.org/author/8859911
11. NIH grant R01 GM085490, Investigation of gene regulation by NF-kappaB transcription factors. Grantome. https://grantome.com/grant/NIH/R01-GM085490-06S1
12. NF-κB/IκB interaction group, UC San Diego program project. https://nfkb-ikb.ucsd.edu/
13. Gourisankar Ghosh, Environmental Molecular Sciences Laboratory. https://www.emsl.pnnl.gov/people/gourisankar-ghosh
14. Determination of the structure of IKK signaling complex by cryo-EM, DOE OSTI award record. https://www.osti.gov/award-doi-service/biblio/10.46936/cpcy.proj.2020.51534/60006850
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*Topic: Encyclopedia › Life and health › Life and health scientists › Life scientists › Researchers in structural biology, biochemistry, and biophysics › Protein crystallography and structural genomics › Enzyme and nucleic acid machinery structures*
*Initially written Sep 21, 2026 · Reviewed: Sep 25, 2026; Sep 30, 2026 · Edited: Sep 25, 2026; Sep 30, 2026; Oct 11, 2026; Oct 15, 2026 · Last review: Sep 30, 2026*
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