Metaproteomics and Host-Microbiome Interactions

Metaproteomics is the large‐scale study of proteins from microbial communities in complex biological samples, providing direct functional readouts of microbiota in situ. When applied to host‐associated environments such as the human gut, it enables simultaneous characterisation of microbial proteomes and host‐derived proteins, thereby illuminating dynamic molecular dialogues that underlie homeostasis, immune modulation and barrier integrity. Advances in mass spectrometry and bioinformatic pipelines now permit quantification of proteome‐level functional redundancy and taxon‐specific activities, bridging the gap between genomic potential and phenotypic expression. This approach has yielded novel insights into disease mechanisms—including inflammatory bowel disorders—and informed the design of in vitro models that faithfully replicate host–microbiome crosstalk. By revealing metabolic pathways, signalling networks and structural components at the protein level, metaproteomics has emerged as a pivotal tool for translating microbiome research into clinical diagnostics, targeted therapeutics and personalised nutrition strategies worldwide.

Research from Nature Portfolio

Recent studies have introduced a metric for proteome‐level functional redundancy (FRp) in the human gut, demonstrating that high FRp arises from nested topologies in proteomic content networks. By integrating protein abundance, functional presence–absence and taxon biomass, the FRp metric outperforms traditional diversity indices in detecting microbiome responses to host individuality, biogeographical variation, xenobiotic exposure and disease states. Crucially, gut inflammation and specific xenobiotics were shown to erode functional redundancy without altering taxonomic richness, highlighting the sensitivity of metaproteomic measures to environmental and pathological perturbations.

In parallel, an in vitro culturing platform utilising a 96‐deep‐well plate format combined with metaproteomic profiling has been developed to conserve both compositional and functional signatures of individual gut microbiomes. This model achieves a high taxon–function correlation before and after culture and replicates drug responses observed in animal models, offering a scalable system for high‐throughput investigation of drug–microbiome interactions and enabling preclinical screening of microbiota‐directed interventions.

Metaproteomics and Host-Microbiome Interactions publication trend

The graph below shows the total number of articles in metaproteomics and host-microbiome interactions across all publications each year (not limited to Nature Index journals).

Technical terms

Metaproteomics: Large‐scale analysis of the complete protein complement expressed by a microbial community within a complex sample, revealing functional activities in situ.

Functional redundancy: The phenomenon whereby different microbial taxa express overlapping sets of proteins, ensuring ecosystem stability by providing similar functional capacities across the community.

Proteomic content network: A bipartite graph linking microbial taxa to their expressed protein functions, used to analyse network topology and nestedness of functional interactions.

Extracellular vesicle: Membrane‐bound particles secreted by host or microbial cells that carry proteins and signalling molecules involved in intercellular communication and modulation of local environments.

In vitro gut model: A laboratory‐based culturing system designed to replicate key functional and compositional features of the gut microbiome under controlled conditions for experimental studies.

References

1. Revealing proteome-level functional redundancy in the human gut microbiome using ultra-deep metaproteomics. Nature Communications (2023).
2. Microbiota-directed biotherapeutics: considerations for quality and functional assessment. Gut Microbes (2023).
3. Advancing functional and translational microbiome research using meta-omics approaches. Microbiome (2019).
4. An in vitro model maintaining taxon-specific functional activities of the gut microbiome. Nature Communications (2019).