Kyle Anderson

NIST

Contact

Email: kwa5025@umd.edu

Call: (240) 314-6285

Education

  • NIST-NRC Postdoctoral Research Associate, 2015-2016
  • PhD, Biochemistry, University of Maryland College Park, 2015
  • BS, Biochemistry and Molecular Biology, Pennsylvania State University, 2010

Profile

Kyle Anderson is a NIST research chemist located at IBBR. His current focus is hydrogen/deuterium exchange mass spectrometry (HDX-MS) for characterization of biopharmaceuticals and vaccines. Additionally, he is involved in method development and measurement improvement of HDX-MS. He received the U.S. Department of Commerce Silver Medal for developing and promoting adoption of methods to determine protein structure that increase patient access to biosimilar drugs. He is President of the Washington Chromatography Discussion Group and a member of the International Society of HDX-MS.

I am accepting applications for NIST-NRC postdoctoral associates in HDX-MS. Application deadlines are Feb 1 and Aug 1. Contact Kyle Anderson before applying. View Job Posting.

 

CURRENT RESEARCH TOPICS

Chromatography at -30 °C for reduced back-exchange and improved dynamic range for HDX-MS

Characterization of protein-based vaccines in formulation by HDX-MS

Characterization of drug-protein interactions by HDX-MS

 

RECENT RESEARCH PROJECTS

Subzero chromatography system for reduced back-exchange and carryover and improved dynamic range

For hydrogen-deuterium exchange mass spectrometry (HDX-MS) to have an increased role in quality control of biopharmaceuticals, H for D back-exchange occurring during protein analyses should be minimized to promote greater reproducibility. Standard HDX-MS analysis systems that digest proteins and separate peptides at pH 2.7 and 0 °C can lose >30% of the deuterium marker within 15 min of sample injection. We developed an analysis system for HDX-MS that conducts chromatography at ‑30°C, reducing back-exchange and enabling chromatographic gradients well beyond an hour. Chromatographic resolution is improved, allowing HDX-MS measurements on a greater number of peptides. Residual back-exchange of ≤ 10 % still occurs, mostly due to preparation zone at 0 °C. The average peptide eluted during a 40 min gradient contained ≈16% more deuterium than peptides eluted with a conventional 8 min gradient at 0 °C. A subset of peptides exhibited ≈26% more deuterium. Although chromatographic peaks shift with EG concentration and temperature, the apparatus elutes unbroadened LC peaks. Electrospray ion intensity does not decline with increasing EG fraction. To minimize bias from sample carryover, the fluidic circuits allow flush and backflush cleaning of all enzyme and LC columns. The system can perform LC separations and clean enzyme columns simultaneously. Reproducibility is enhanced by regulating temperature zones to ±0.05 °C.

Interlaboratory comparison of HDX-MS measurements using Fab of NISTmAb

An interlaboratory study involving 37 co-authors in 15 unharmonized laboratories determined the reproducibility of continuous-labeling, bottom-up HDX-MS measurements by measuring the deuterium uptake of Fab of NISTmAb RM8671 (PDB: 5K8A) for immersions in D2O for tHDX = (30 to 14400) s and THDX = (25, 21, 3.6) °C. Each laboratory was sent a standardized kit containing Fab protein and the reagents necessary to conduct experiments.

Laboratories reported ≈89,800 centroid measurements for 430 proteolytic peptide sequences of the Fab fragment (≈78,900 centroids), giving nearly 100 % coverage, and approximately 10,900 centroid measurements for 77 peptide sequences of the Fc fragment. Nearly half of peptide sequences are unique to the reporting laboratory, and only two sequences are reported by all laboratories. The majority of the laboratories (87 %) exhibited centroid mass laboratory repeatability precisions of ≤ (0.15 ±0.01) Da (1σx). All laboratories achieved ≤ 0.4 Da. For immersions of protein at THDX = (3.6 to 25) °C and for D2O exchange times of tHDX = (30 s to 4 h) the reproducibility of back-exchange corrected, deuterium uptake measurements for the 15 laboratories is (9.0 ±0.9) % (1s). A 9 lab cohort that immersed samples at THDX = 25 °C exhibited reproducibility of (6.5 ±0.6) % for back-exchange corrected, deuterium uptake measurements.

Automated removal of phospholipids from membrane proteins

A new, automated approach was developed to study structural dynamics of membrane proteins, the most common targets for pharmaceuticals. The new method involves isolation of proteins from phospholipid bilayers using a scheme that is compatible with robotic handling. The key development was the introduction of ZrO2 microbeads, which strongly coordinate with the phospholipids, and then removal of microbead-coordinated phospholipids by inline filtration. Protein is thus freed from phospholipids, which interfere with analysis by LC-MS.

Previous HDX-MS publications on membrane protein dynamics removed phospholipids manually, which reduced reproduciblity and increased analysis time. The new approach was demonstrated on the transmembrane protein FcγRIIa, and showed information about the regions outside of, across, and inside of its liposomal membrane, enabling measurement of structural dynamics of the whole protein. This approach is the first to enable fully automated removal of phospholipids for HDX-MS on full-length transmembrane proteins in lipid bilayers.

Publications
2022
Chromatography at -30 °C for Reduced Back-Exchange, Reduced Carryover, and Improved Dynamic Range for Hydrogen-Deuterium Exchange Mass Spectrometry.
Interlaboratory Studies Using the NISTmAb to Advance Biopharmaceutical Structural Analytics.
2021
HDX-MS and MD Simulations Provide Evidence for Stabilization of the IgG1-FcγRIa (CD64a) Immune Complex Through Intermolecular Glycoprotein Bonds.
Copper-binding anticancer peptides from the piscidin family: an expanded mechanism that encompasses physical and chemical bilayer disruption.
2020
Conformational gating, dynamics and allostery in human monoacylglycerol lipase.
2019
Interlaboratory Comparison of Hydrogen-Deuterium Exchange Mass Spectrometry Measurements of the Fab Fragment of NISTmAb.
Hydrogen-Deuterium Exchange Mass Spectrometry (HDX-MS) Centroid Data Measured between 3.6 °C and 25.4 °C for the Fab Fragment of NISTmAb.
2018
Automated Removal of Phospholipids from Membrane Proteins for H/D Exchange Mass Spectrometry Workflows.
2017
Transcriptional and post-translational changes in the brain of mice deficient in cholesterol removal mediated by cytochrome P450 46A1 (CYP46A1).
Assessment of Extracellular Vesicles Purity Using Proteomic Standards.
In vitro cytochrome P450 46A1 (CYP46A1) activation by neuroactive compounds.
Conformational Changes in Active and Inactive States of Human PP2Cα Characterized by Hydrogen/Deuterium Exchange-Mass Spectrometry.
Cytochrome P450 27A1 Deficiency and Regional Differences in Brain Sterol Metabolism Cause Preferential Cholestanol Accumulation in the Cerebellum.
A new approach to quantification of mAb aggregates using peptide affinity probes.
2016
Mapping of the Allosteric Site in Cholesterol Hydroxylase CYP46A1 for Efavirenz, a Drug That Stimulates Enzyme Activity.
2015
Quantification of Borrelia burgdorferi Membrane Proteins in Human Serum: A New Concept for Detection of Bacterial Infection.
Histone post-translational modifications in frontal cortex from human donors with Alzheimer's disease.
Histone H3 Ser57 and Thr58 phosphorylation in the brain of 5XFAD mice.
Quantification of histone deacetylase isoforms in human frontal cortex, human retina, and mouse brain.
2014
Natural flanking sequences for peptides included in a quantification concatamer internal standard.