HRP SU25-5: Research Opportunity with Dr. Steven Chou

Project Mentor

Dr. Steven Chou
Department of Molecular Biology & Biophysics

Undergraduate Research Opportunity Description

Project Description Biochemical Characterization of the NPR1 Transmembrane Signaling Complex.
Natriuretic peptide receptor 1 (NPR1) is a single-transmembrane guanylyl cyclase that plays a critical role in regulating blood pressure. The binding of atrial natriuretic peptide (ANP) to the extracellular domain (ECD) of NPR1 induces conformational changes in the transmembrane helices, propagating the signal to the intracellular domain (ICD) and its binding partners. However, the structural and biochemical characterization of NPR1 has been challenging due to its extensive post-translational modifications (PTMs) and high conformational flexibility, which hinder analysis using overexpression systems.
To overcome these challenges, we propose an alternative approach to isolate the NPR1 signaling complex directly from natural sources. We aim to purify the intact complex and identify its components using mass spectrometry.
Project Direction During the summer of 2025, we aim to purify the intact complex and identify its components using mass spectrometry. If the isolated sample is sufficiently homogeneous, we will determine its three-dimensional structure using high-resolution cryo-electron microscopy in the fall of 2025.
The successful completion of this project will provide critical insights into the structural and mechanistic basis of NPR1-mediated signal transduction, enhancing our understanding of blood pressure regulation and paving the way for potential therapeutic advances.
Mentorship and Supervision A PhD graduate student and the PI will work closely with the undergraduate student to ensure a thorough understanding of the project and experimental procedures. The mentoring process will include the following steps:

Experimental Design: The graduate student and PI will explain the rationale and objectives of the experiments, providing context for their scientific significance.
Protocol Guidance: A detailed, step-by-step protocol will be provided to the undergraduate student for reference and study.
Demonstration: The graduate student will demonstrate the entire procedure, ensuring the undergraduate student observes and understands each step.
Lab Notebook Review: The PI and graduate student will periodically review the undergraduate student’s lab notebook to ensure accurate and thorough documentation.

Undergraduate Student Responsibilities

Active Feedback: The undergraduate student should communicate openly, asking questions and providing feedback whenever there is confusion or need for clarification.
Engagement in Lab Meetings: Active participation in lab meetings is expected, including presenting progress when appropriate and contributing to discussions.

Student Qualifications A. Basic Understanding of Proteins
Students are expected to have foundational knowledge about proteins, including the following concepts:
1. Amino Acids: The building blocks of proteins.
2. Post-Translational Modifications: Certain amino acids are chemically modified after translation, altering protein function.
3. Membrane Proteins: These proteins are embedded in lipid bilayers, often requiring specific conditions for stability and study.
4. Protein-Protein Interactions: Proteins can bind to one another to form functional complexes critical for biological processes.
5. Conformational Dynamics: Protein complexes may exhibit flexibility and undergo structural changes upon interaction with different binding partners.

B. Basic Understanding of Buffers
Students should familiarize themselves with the components and purposes of buffers, including:
1. Buffering Reagents: To maintain pH stability during experiments.
2. Salts: For ionic strength and protein stability.
3. Detergents: To solubilize membrane proteins and stabilize hydrophobic regions.
4. Reductive and Oxidative Reagents: For controlling the redox state of protein samples.

C. Laboratory Practice
Students are expected to maintain a meticulous and detailed lab notebook, documenting all experimental procedures, observations, and results. A well-organized notebook is essential for reproducibility and accurate data interpretation.

Summer Schedule Options Monday-Friday 9am through 6pm
Project Continuation Fall 2025, Spring 2026
Academic Year Time Commitment 6 hours/week
Possible Thesis Project Yes

Application

Submit an online application for this research opportunity at https://quest.uconn.edu/prog/HRPSU25-5. The application deadline is Monday, February 17, 2025.

This application requires a cover letter and a resume or CV.