# Robert Tycko
**Robert Tycko** (also published as R. Tycko; born 1959 in New York City) is an American biophysical chemist who applies solid-state nuclear magnetic resonance (ssNMR) spectroscopy to the molecular structures of amyloid fibrils, the filamentous protein aggregates found in Alzheimer's disease and other neurodegenerative conditions. He has been a senior investigator at the National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK) since 1994, and he previously spent eight years at AT&T Bell Laboratories.[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) • [2](https://www.nasonline.org/directory-entry/robert-tycko-7rkwtu/) Solid-state NMR is the branch of magnetic resonance spectroscopy that handles solids and other samples that cannot be studied by solution NMR; beginning in the 1990s it produced the first experimentally based structural models of amyloid fibrils.[3](https://europepmc.org/article/MED/40199041)
| Fact | Detail |
|---|---|
| Born | 1959, New York City; raised principally on Long Island[2](https://www.nasonline.org/directory-entry/robert-tycko-7rkwtu/) |
| Training | A.B., Princeton University, 1980; Ph.D., University of California, Berkeley, 1984, under Alex Pines[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) • [4](https://eas.org/2014-eas-award-outstanding-achievements-nmr/) |
| Career | AT&T Bell Laboratories, 1986–1994; Laboratory of Chemical Physics, NIDDK, NIH, since 1994[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) |
| Signature work | Molecular structure of β-amyloid fibrils from Alzheimer's brain tissue (Cell, 2013); structural variation of Aβ fibrils across clinical subtypes (Nature, 2017)[5](https://pmc.ncbi.nlm.nih.gov/articles/PMC3814033/) • [6](https://www.nature.com/articles/nature20814) |
| Technique | Solid-state NMR, supplemented by electron microscopy and cryo-EM[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) |
| Honors | NAS member (2020); Fellow of APS (1997), AAAS (2005), ISMAR (2008), American Academy of Arts and Sciences (2017)[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) |
## Early life and education
Tycko was born in New York City in 1959 and raised principally on [Long Island](https://www.edgepedia.org/long-island).[2](https://www.nasonline.org/directory-entry/robert-tycko-7rkwtu/) He earned an A.B. in physical chemistry at Princeton University in 1980.[4](https://eas.org/2014-eas-award-outstanding-achievements-nmr/) His Ph.D. came from the [University of California](https://www.edgepedia.org/university-of-california), Berkeley in 1984; his thesis, *Broadband Excitation in Nuclear Magnetic Resonance*, was completed at Lawrence Berkeley Laboratory and focused on new NMR methods under Alex Pines.[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) • [7](https://www.osti.gov/servlets/purl/971085) • [4](https://eas.org/2014-eas-award-outstanding-achievements-nmr/) He then spent 1984 to 1986 as a postdoctoral researcher at the University of Pennsylvania.[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert)
## Career
From 1986 to 1994 Tycko was a Member of Technical Staff (Principal Investigator) in the Physical Chemistry Research Department at AT&T Bell Laboratories.[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) There he used solid-state NMR to characterize fullerenes and alkali fulleride superconductors, and worked on protein folding, ligand binding, and aggregation processes together with new experimental methods for studying them.[8](https://www.amacad.org/person/robert-tycko)
In 1994 he joined the NIH Intramural Research Program as a Senior Investigator in the Laboratory of Chemical Physics at NIDDK, where he leads the Solid-State Nuclear Magnetic Resonance and Biomolecular Physics Section; the NIDDK directory lists him as an NIH Distinguished Investigator and Acting Chief of the Laboratory of Chemical Physics.[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) He is a former president of the International Society of Magnetic Resonance and became a PNAS member editor.[2](https://www.nasonline.org/directory-entry/robert-tycko-7rkwtu/) • [9](https://nrc88.nas.edu/pnas_search/memberDetails.aspx?ctID=20005931)
## Research
His group uses solid-state NMR and electron microscopy to determine molecular structures that are inaccessible to x-ray diffraction or solution NMR, principally amyloid-β fibrils, including fibrils that develop in the brain tissue of Alzheimer's disease patients.[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) Amyloid-β (Aβ) peptides aggregate into polymorphic fibrils and intermediate assemblies such as oligomers and protofibrils both in vitro and in human brain tissue.[10](https://pmc.ncbi.nlm.nih.gov/articles/PMC4968170/)
A recurring tool in this work is seeded fibril growth: a specific brain-derived Aβ40 fibril polymorph was obtained from cortical tissue of an Alzheimer's patient by seeded growth, and its structure was determined from cryo-EM images supplemented by mass-per-length measurements and solid-state NMR data.[11](https://doi.org/10.1073/pnas.2023089118)
The group also develops methods. It is building time-resolved ssNMR approaches for transient intermediates on the millisecond timescale and ultra-low-temperature sensitivity-enhancement methods aimed at sub-micron resolution MRI of cells.[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) • [2](https://www.nasonline.org/directory-entry/robert-tycko-7rkwtu/) Other projects characterize protein assemblies that mimic assemblies within HIV-1 and [SARS-CoV-2](https://www.edgepedia.org/sars-cov-2) virions.[12](https://irp.nih.gov/pi/robert-tycko)
## Representative work
His 2013 Cell paper, *Molecular Structure of β-Amyloid Fibrils in Alzheimer's Disease Brain Tissue*, reported that different 40-residue Aβ fibril structures were present in the brain tissue of different Alzheimer's disease patients, and that a structural model of Aβ40 fibrils from one patient revealed features that distinguish in vivo from in vitro fibrils.[5](https://pmc.ncbi.nlm.nih.gov/articles/PMC3814033/)
The 2017 Nature paper, *Structural variation in amyloid-β fibrils from Alzheimer's disease clinical subtypes*, extended this finding to clinical classification, showing that distinct Aβ fibril structures correlate with different clinical subtypes of the disease.[6](https://www.nature.com/articles/nature20814) Related work determined the molecular structure of amyloid-like fibrils formed by the full-length low-complexity (LC) domain of FUS, a protein relevant to amyotrophic lateral sclerosis and frontotemporal dementia: a specific 57-residue segment in the N-terminal half forms the ordered cross-β fibril core while the C-terminal half remains dynamically disordered, and a companion cryo-EM model showed residues 112–150 adopting U-shaped conformations in an in-register parallel cross-β structure.[13](https://www.nature.com/articles/s41467-020-19512-3) His group also determined, at 2.8 Å resolution, the structure of the most prevalent brain-derived Aβ40 fibril polymorph from typical Alzheimer's patients; it differs qualitatively from all previously described Aβ fibril structures.[11](https://doi.org/10.1073/pnas.2023089118)
## Recent developments
Group output since 2023 has continued along several lines. The March 2023 PNAS paper reported brain-derived 42-residue Aβ fibril polymorphs with unusual molecular conformations and intermolecular interactions.[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) A 2023 EMBO Reports study showed that two structurally defined Aβ polymorphs promote different pathological changes in susceptible mice, connecting fibril structure to in vivo pathology.[14](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert/publications) Also in 2023, a [Nature Communications](https://www.edgepedia.org/nature-communications) paper probed early events in Aβ self-assembly using time-resolved solid-state NMR and light scattering.[14](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert/publications) In 2024 the group reported experimental evidence for millisecond-timescale structural evolution following microsecond-timescale folding of a small protein ([Physical Review Letters](https://www.edgepedia.org/physical-review-letters)) and a solid-state NMR and microscopy characterization of amyloid peptide ribbons (*J. Phys. Chem. B*).[14](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert/publications) The 2013 ex vivo structure continued to be cited into 2026, including in a [Methods in Enzymology](https://www.edgepedia.org/methods-in-enzymology) chapter on time-resolved ssNMR studies of Aβ oligomer formation.[15](https://doi.org/10.1016/bs.mie.2026.01.035)
## Solid-state NMR and cryo-EM
Solid-state NMR played a major role from the 1990s onward in elucidating amyloid fibril structures: general principles were uncovered and the first experimentally based structural models came from ssNMR data.[3](https://europepmc.org/article/MED/40199041) Since 2017, cryo-EM techniques have become capable of solving amyloid structures at near-atomic resolution and are now the main approach, but ssNMR remains essential for certain structures and structural features and for studies of dynamics and mechanism.[3](https://europepmc.org/article/MED/40199041)
A central insight from this body of work is that the amino acid sequence of an amyloid fibril does not uniquely determine its molecular structure. Self-propagating, molecular-level polymorphism complicates structure determination and can produce apparent disagreements between laboratories that are in fact studying different polymorphs.[16](https://pubs.acs.org/doi/abs/10.1021/ar300282r) For Aβ1-40 fibrils, detailed ssNMR and electron-microscopy models of two polymorphs showed similar peptide conformations and identical in-register parallel β-sheet organization but different overall symmetry,[16](https://pubs.acs.org/doi/abs/10.1021/ar300282r) and structurally distinct Aβ fibrils have been found in the brain tissue of different patients and across different clinical subtypes of Alzheimer's disease.[5](https://pmc.ncbi.nlm.nih.gov/articles/PMC3814033/) • [6](https://www.nature.com/articles/nature20814)
## Honors and recognition
Tycko is a Member of the National Academy of Sciences (2020) and a Fellow of the [American Physical Society](https://www.edgepedia.org/american-physical-society) (1997), the [American Association for the Advancement of Science](https://www.edgepedia.org/american-association-for-the-advancement-of-science) (2005), the International Society of Magnetic Resonance (2008), and the American Academy of Arts and Sciences (2017).[1](https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert) He received the Eastern Analytical Symposium's 2014 Award for Outstanding Achievements in NMR.[4](https://eas.org/2014-eas-award-outstanding-achievements-nmr/)
## References
1. Robert Tycko, Ph.D., NIH Distinguished Investigator, NIDDK Staff Directory. https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert
2. Robert Tycko, National Academy of Sciences directory. https://www.nasonline.org/directory-entry/robert-tycko-7rkwtu/
3. The evolving role of solid state nuclear magnetic resonance methods in studies of amyloid fibrils (Europe PMC abstract). https://europepmc.org/article/MED/40199041
4. 2014 EAS Award for Outstanding Achievements in NMR, Eastern Analytical Symposium. https://eas.org/2014-eas-award-outstanding-achievements-nmr/
5. Lu JX et al. Molecular structure of β-amyloid fibrils in Alzheimer's disease brain tissue. Cell (2013). https://pmc.ncbi.nlm.nih.gov/articles/PMC3814033/
6. Qiang W, Yau WM, Lu JX, Collinge J, Tycko R. Structural variation in amyloid-β fibrils from Alzheimer's disease clinical subtypes. Nature 541, 217–221 (2017). https://www.nature.com/articles/nature20814
7. Broadband Excitation in Nuclear Magnetic Resonance (R. Tycko Ph.D. Thesis, Lawrence Berkeley Laboratory, October 1984). https://www.osti.gov/servlets/purl/971085
8. Robert Tycko, American Academy of Arts and Sciences. https://www.amacad.org/person/robert-tycko
9. PNAS Member Editor Details, Robert Tycko. https://nrc88.nas.edu/pnas_search/memberDetails.aspx?ctID=20005931
10. Molecular Structure of Aggregated Amyloid-β: Insights from Solid-State Nuclear Magnetic Resonance (Accounts of Chemical Research). https://pmc.ncbi.nlm.nih.gov/articles/PMC4968170/
11. Molecular structure of a prevalent amyloid-β fibril polymorph from Alzheimer's disease brain tissue (PNAS). https://doi.org/10.1073/pnas.2023089118
12. Robert Tycko, Ph.D., NIH Intramural Research Program. https://irp.nih.gov/pi/robert-tycko
13. Molecular structure and interactions within amyloid-like fibrils formed by a low-complexity protein sequence from FUS, Nature Communications (2020). https://www.nature.com/articles/s41467-020-19512-3
14. Robert Tycko, Ph.D., Publications (NIDDK Staff Directory). https://www.niddk.nih.gov/about-niddk/staff-directory/biography/tycko-robert/publications
15. Time-resolved solid-state nuclear magnetic resonance studies of amyloid-β oligomer formation (Methods in Enzymology, 2026). https://doi.org/10.1016/bs.mie.2026.01.035
16. Molecular Structures of Amyloid and Prion Fibrils: Consensus versus Controversy (Accounts of Chemical Research). https://pubs.acs.org/doi/abs/10.1021/ar300282r
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*Topic: Encyclopedia › Physical world and mathematics › Physical and mathematical scientists › Chemists › Researchers in chemical biology, analytical chemistry, and mass spectrometry › Biochemistry and enzymology*
*Initially written Sep 20, 2026 · Reviewed: Sep 25, 2026 · Edited: Sep 25, 2026; Oct 15, 2026; Oct 21, 2026 · Last review: Sep 25, 2026*
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