Shivam Dewan | 2024 I.S. Symposium

Shivam Dewan head shot

Name: Shivam Dewan
Title: Elucidating the Role of Reactive Oxygen Species on Dopamine 𝛽-Hydroxylase Activity and Aggregation
Major: Biochemistry & Molecular Biology
Advisors: Annastassia Gallo and Mark Snider

Dopamine 𝛽-Hydroxylase (DBH) is a copper-containing monooxygenase that catalyzes the hydroxylation of dopamine to norepinephrine. Deficiency of norepinephrine, a neurotransmitter important for the modulation of nervous system functions such as attention, arousal, and cognition, learning, and memory has ties to the progression of neurodegenerative diseases such as Alzheimer’s (AD) and Parkinson’s disease (PD). Evidence shows that AD and PD both may be caused by DBH dysfunction through either degeneration of locus coeruleus (LC) noradrenergic neurons, neuroinflammation, or dysregulation of metals such as copper and iron. Overproduction of reactive oxygen species (ROS) can lead to the irreversible oxidation of proteins which can affect cell homeostasis.

Exposure to ROS may alter DBH activity and lead to aggregation. For both AD and PD, the aggregated misfolded proteins are specific to each in that for AD, the hallmarks include 𝛽-amyloid and tau protein aggregates while in PD, the hallmarks include aggregated 𝛼-synuclein in Lewy bodies. Through the use of a colorimetric assay using DMPD and peptide identification by mass spectrometry, we investigated how metal oxidative conditions impacted DBH. We found DBH was inactive under our conditions and the HPLC-MS/MS chromatograms did not yield any significant peaks for the mass values of interest.

Posted in Symposium 2024 on April 23, 2024.