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@ARTICLE{Genz:642193,
author = {Genz, Luca R. and Nair, Sanjana and Nagar, Natan and Topf,
Maya},
title = {{A}ssessing scoring metrics for {A}lpha{F}old2 and
{A}lpha{F}old3 protein complex predictions},
journal = {Protein science},
volume = {34},
number = {11},
issn = {0961-8368},
address = {Hoboken, NJ},
publisher = {Wiley},
reportid = {PUBDB-2025-05389},
pages = {e70327},
year = {2025},
note = {DFG CRC1648},
abstract = {Recent breakthroughs in AI-driven protein structure
prediction have revolutionized structural biology, unlocking
new possibilities to model complex biomolecular
interactions. We evaluated widely used scoring metrics for
assessing models predicted by ColabFold with templates,
ColabFold without templates, and AlphaFold3. We benchmarked
the optimal cutoffs for these assessment scores using a set
of 223 heterodimeric, high-resolution protein structures and
their predictions. Our results show that ColabFold with
templates and AlphaFold3 perform similarly, and both
outperform ColabFold without templates. However, the
assessment scores perform best on ColabFold without
templates. Furthermore, interface-specific scores are more
reliable for evaluating protein complex predictions compared
to the corresponding global scores. Notably, ipTM and model
confidence achieve the best discrimination between correct
and incorrect predictions. Based on our results, we
developed a weighted combined score, C2Qscore, to improve
model quality assessment. We used C2Qscore to analyze dimers
from large assemblies solved by cryoEM, revealing potential
limitations of the existing metrics when multiple
configurations of heterodimers are possible. This study
provides insights into the strengths and weaknesses of
current scores and offers guidance for improving protein
complex model assessment under realistic use case
conditions. C2Qscore has been integrated as a tool into our
ChimeraX plug-in PICKLUSTER v.2.0 and is also available as a
command-line tool on https://gitlab.com/topf-lab/c2qscore.},
cin = {CSSB-LIV/UKE-MT},
ddc = {610},
cid = {$I:(DE-H253)CSSB-LIV_UKE-MT-20220525$},
pnm = {899 - ohne Topic (POF4-899)},
pid = {G:(DE-HGF)POF4-899},
experiment = {EXP:(DE-MLZ)NOSPEC-20140101},
typ = {PUB:(DE-HGF)16},
doi = {10.1002/pro.70327},
url = {https://bib-pubdb1.desy.de/record/642193},
}