Structure and Stabilities of Solution and Gas Phase Protein Complexes.

Collision-induced unfolding (CIU) has provided new levels of understanding of the stabilities and structure(s) for gas phase protein and protein complex ions formed by electrospray ionization (ESI). Variable-temperature (vT-ESI) data provide complementary information about temperature-induced folding/unfolding (TIU) reactions of solution phase ions. Results obtained by using CIU and TIU provide complementary information about stabilities of gas phase versus solution phase ions.

Temperature-Dependent Trimethylamine -Oxide Induced the Formation of Substance P Dimers.

Interactions of the peptide substance P (SP) (RPKPQQFFGLM-NH) with trimethylamine -oxide (TMAO) were investigated by using cryo-ion mobility-mass spectrometry (cryo-IM-MS), variable-temperature (278-358 K) electrospray ionization (vT-ESI) MS, and molecular dynamics (MD) simulations. Cryo-IM-MS provides evidence that cold solutions containing SP and TMAO yield abundant hydrated SP dimer ions, but dimer formation is inhibited in solutions that also contain urea. In addition, we show that SP dimer formation at cold solution temperatures (<298 K) is favored when TMAO interacts with the hydrophobic C-terminus of SP and is subject to reduced entropic penalty when compared to warmer solution conditions (>298 K).

Water Plays Key Roles in Stabilities of Wild Type and Mutant Transthyretin Complexes.

Transthyretin (TTR), a 56 kDa homotetramer that is involved in the transport of thyroxine and retinol, has been linked to amyloidosis through disassembly of tetramers to form monomers, dimers, and trimers that then reassemble into higher order oligomers and/or fibrils. Hybrid TTR (hTTR) tetramers are found in heterozygous individuals that express both wild type TTR (wt-TTR) and mutant TTR (mTTR) forms of the protein, and these states display increased rates of amyloidosis. Here we monitor subunit exchange (SUE) reactions involving homomeric and mixed tetramers using high resolution native mass spectrometry (nMS).

Production, isolation, and shipment of clinically relevant quantities of astatine-211: A simple and efficient approach to increasing supply.

Unlabelled: The alpha emitter astatine-211 (At) is a promising candidate for cancer treatment based on Targeted Alpha (α) Therapy (TAT). A small number of facilities, distributed across the United States, are capable of accelerating α-particle beams to produce At. However, challenges remain regarding strategic methods for shipping At in a form adaptable to advanced radiochemistry reactions and other uses of the radioisotope.

Survey of the training needs of genetic assistants supports the creation of genetic assistant training programs.

Despite the increasing numbers of genetic assistants (GAs) in the genomics workforce, their training needs and how to best prepare GAs for their role have not been well defined. We sought to identify the current educational status of GAs, opinions on their training needs, and attitudes about GA training programs (GATPs). Survey links were emailed to NSGC members, 17 state genetic counseling (GC) professional organizations, and genomic medicine researchers.