Senior Scientist – Cryo-EM

Helix Bio Structures, LLC (HBS) is a contract research organization based in Indianapolis, Indiana, providing early drug discovery services to the biopharmaceutical industry. HBS maintains a full suite of services that encompass chemical & structural analysis, protein production, computational modeling, and design. HBS’s core and most popular services are structural biology imaging techniques: X-ray Crystallography and Cryo-EM. HBS was founded in 2018 and has grown considerably.

We are looking to add a Senior Scientist focused on cryo-EM to join our Indianapolis-based team.

This senior scientist will own cryo-EM structure determination on client programs, from sample and grid optimization through data collection, processing, model building, validation, and deposition. A portion of this scientist’s time will also be spent expressing and purifying recombinant proteins to cryo-EM-grade sample quality, both for their own structures and in support of the broader Protein Sciences group. This is a client-facing role: the successful candidate will write technical reports, present results on project calls, and help scope feasibility for prospective work.

Highly desirable hands-on experiences include:

(a) Independent, end-to-end single-particle cryo-EM: vitrification and grid optimization, screening and automated data collection, processing, model building, refinement, validation, and EMDB/PDB deposition.

(b) Recombinant protein expression and purification to cryo-EM-grade sample quality, including multi-component complexes and detergent- or nanodisc-solubilized targets.

We are looking for someone who can run the cryo-EM pipeline from day one with minimal training on our side. The successful candidate will have already taken multiple structures from sample to deposited coordinates independently, will exercise sound judgment about when a sample, grid, or dataset is worth pushing forward, and will be comfortable explaining those decisions directly to clients. As a senior member of the team, this scientist will mentor junior staff, set technical standards, and help shape how we scope and execute cryo-EM projects.

Overall, you will be an outstanding structural biologist and collaborator with a significant and visible impact on our client portfolio.

• Optimize samples and grids for cryo-EM, including buffer, concentration, additive, detergent, and support screening; vitrify using Vitrobot and/or Chameleon.
• Screen grids and collect single-particle datasets on 200 kV and 300 kV instruments (Glacios and Krios class) using EPU and/or SerialEM.
• Process datasets in cryoSPARC and/or RELION, including motion correction, CTF estimation, particle picking, 2D and 3D classification, refinement, and local refinement or symmetry expansion as needed.
• Build, refine, and validate models in Coot, Phenix, and ISOLDE, and prepare and complete EMDB and PDB depositions.
• Express and purify recombinant proteins to cryo-EM-grade quality in support of assigned programs and the broader Protein Sciences group.
• Interface directly with clients: lead scientific update calls, present results, and support feasibility assessment and technical scoping for prospective projects.
• Mentor junior scientists and research associates, and author and maintain SOPs for sample preparation, data collection, and processing.
• The candidate will be responsible for timely updates on project statuses, reporting to their supervisor informally and to Helix’s customers by formal report writing and oral presentations.

• Ph.D. in structural biology, biochemistry, biophysics, or a related field with 4 or more years of relevant post-doctoral or industrial cryo-EM experience; OR a Master’s degree with…