Human Bone Paleoproteomics Utilizing the Single-Pot, Solid-Phase-Enhanced Sample Preparation Method to Maximize...

Area of Science:

• Paleoproteomics
• Biochemistry
• Analytical Chemistry

Background:

• Sample preparation is crucial for bone proteomics and paleoproteomics.
• Traditional methods like in-solution digestion and filter-aided sample preparation (FASP) have limitations in maximizing protein detection from bone.
• FASP's molecular weight cutoff can exclude valuable protein fragments from fossil bones.

Observation:

• The study investigated the efficacy of the single-pot, solid-phase-enhanced sample preparation (SP3) method for historical human bone samples.
• Two extraction buffers were tested: tetrasodium EDTA and a combination of ammonium phosphate dibasic, ammonium bicarbonate, and guanidine HCl.
• SP3 was compared against conventional methods for its ability to identify proteins and remove contaminants.

Findings:

• The SP3 method identified a significant number of protein accessions (78 ± 7 and 79 ± 17) from historical bones, including challenging proteins like osteopontin.
• SP3 effectively removed over 90% of co-extracted humic substances, indicated by reduced absorbance.
• This method overcomes the limitations of molecular weight cutoffs associated with FASP.

Implications:

• The SP3 method shows great promise for advancing paleoproteomic studies by maximizing protein detection in ancient bone samples.
• Improved sample preparation techniques like SP3 can lead to a more comprehensive understanding of ancient biological materials.
• This advancement facilitates the characterization of a wider range of proteins, offering deeper insights into evolutionary and historical biology.