Research

Our group develops novel computational methods that combine big-data algorithms and machine learning to make sense of the ever-growing universe of biological sequences and structures. We build fast, open-source tools that search, cluster, assemble, and predict proteins and genomes at the scale of entire databases — turning massive genomic and proteomic datasets into biological insight, from microbial communities to the organization of the protein structure universe.

*: First author
†: Corresponding author
Lab members in bold

Sequence search & clustering

MMseqs2 (Many-against-Many sequence searching) is a software suite to search and cluster huge protein and nucleotide sequence sets, running orders of magnitude faster than BLAST while matching PSI-BLAST sensitivity in profile searches.

Steinegger M.*, Söding J.† (2017) MMseqs2: Sensitive protein sequence searching for the analysis of massive data sets, Nature Biotechnology [preprint] [journal] [software]
Kallenborn F.*, Chacón A.*, Hundt C., Sirelkhatim H., Didi K., Cha S., Dallago C., Mirdita M., Schmidt B., Steinegger M.† (2025) GPU-accelerated homology search with MMseqs2, Nature Methods [journal] [software]

Linclust clusters huge sequence sets with a runtime that scales linearly with input size — not quadratically as in conventional algorithms — making it orders of magnitude faster than comparable methods.

Steinegger M.*†, Söding J.† (2018) Clustering huge protein sequence sets in linear time, Nature Communications [preprint] [journal] [software]

Protein structure

Folddisco indexes and searches discontinuous structural motifs — such as catalytic sites and binding pockets whose residues are distant in sequence — enabling fast motif queries across millions of protein structures.

Kim H.*, Kim R.S., Mirdita M., Yoon J., Steinegger M.† (2026) Structural motif search across the protein universe with Folddisco, Nature Biotechnology [journal] [software]

FoldMason builds accurate multiple structure alignments of proteins at scale, leveraging structural information to align thousands of remote homologs that elude sequence-based methods and to reconstruct their evolutionary relationships.

Gilchrist C.L.M.*†, Mirdita M., Steinegger M.† (2026) Multiple protein structure alignment at scale with FoldMason, Science [journal] [software]

Foldseek-Multimer extends Foldseek to align and search protein complexes, enabling rapid and sensitive comparison of multi-chain structures across the entire predicted complex universe.

Kim W.*, Mirdita M., Levy K.E., Gilchrist C.L.M., Schweke H., Söding J., Levy E.D.†, Steinegger M.† (2025) Rapid and sensitive protein complex alignment with Foldseek-Multimer, Nature Methods [preprint] [journal] [software]

AFDB Clusters applies Foldseek clustering to the entire AlphaFold Protein Structure Database, grouping the predicted protein universe into structural clusters that reveal previously unseen protein families and their relationships.

Barrio-Hernandez I.*, Yeo J.*, Jänes J., Mirdita M., Gilchrist C.L.M., Wein T., Varadi M., Velankar S., Beltrao P.†, Steinegger M.† (2023) Clustering predicted structures at the scale of the known protein universe, Nature [preprint] [journal] [software]

Foldseek is a software suite for searching and clustering protein structures, orders of magnitude faster than state-of-the-art structural aligners — letting you query millions of structures in seconds.

van Kempen M.*, Kim S.S.*, Tumescheit C., Mirdita M., Lee J., Gilchrist C.L.M., Söding J.†, Steinegger M.† (2023) Fast and accurate protein structure search with Foldseek, Nature Biotechnology [preprint] [journal] [software]

ColabFold is an easy-to-use environment for fast protein structure prediction. It pairs AlphaFold2 and RoseTTAFold with fast MMseqs2-based MSA generation, making predictions orders of magnitude faster than the standard AlphaFold system.

Mirdita M.*†, Schütze K., Moriwaki Y., Heo L., Ovchinnikov S.†, Steinegger M.† (2022) ColabFold: making protein folding accessible to all, Nature Methods [preprint] [journal] [software]

Metagenomics

Metabuli is a metagenomic classification tool that jointly analyzes amino acid and DNA sequences, combining the sensitivity of amino-acid searches with the specificity of DNA-level resolution to taxonomically profile complex samples.

Kim J.*, Steinegger M.† (2024) Metabuli: sensitive and specific metagenomic classification via joint analysis of amino acid and DNA, Nature Methods [preprint] [journal] [software]

Conterminator is an efficient method for detecting incorrectly labeled sequences across kingdoms by an exhaustive all-against-all sequence comparison.

Steinegger M.*†, Salzberg S.L.† (2020) Terminating contamination: large-scale search identifies more than 2,000,000 contaminated entries in GenBank, Genome Biology [preprint] [journal] [software]

Plass assembles short-read sequencing data at the protein level, targeting complex metagenomes. It recovers many times more protein residues from soil metagenomes than nucleotide assemblers such as Megahit.

Steinegger M.*†, Mirdita M., Söding J.† (2019) Protein-level assembly increases protein sequence recovery from metagenomic samples manyfold, Nature Methods [journal] [software]