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2017 ; 28
(5
): 673-680
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Nano Random Forests to mine protein complexes and their relationships in
quantitative proteomics data
#MMPMID28057767
Montaņo-Gutierrez LF
; Ohta S
; Kustatscher G
; Earnshaw WC
; Rappsilber J
Mol Biol Cell
2017[Mar]; 28
(5
): 673-680
PMID28057767
show ga
Ever-increasing numbers of quantitative proteomics data sets constitute an
underexploited resource for investigating protein function. Multiprotein
complexes often follow consistent trends in these experiments, which could
provide insights about their biology. Yet, as more experiments are considered, a
complex's signature may become conditional and less identifiable. Previously we
successfully distinguished the general proteomic signature of genuine chromosomal
proteins from hitchhikers using the Random Forests (RF) machine learning
algorithm. Here we test whether small protein complexes can define
distinguishable signatures of their own, despite the assumption that machine
learning needs large training sets. We show, with simulated and real proteomics
data, that RF can detect small protein complexes and relationships between them.
We identify several complexes in quantitative proteomics results of wild-type and
knockout mitotic chromosomes. Other proteins covary strongly with these
complexes, suggesting novel functional links for later study. Integrating the RF
analysis for several complexes reveals known interdependences among kinetochore
subunits and a novel dependence between the inner kinetochore and condensin.
Ribosomal proteins, although identified, remained independent of kinetochore
subcomplexes. Together these results show that this complex-oriented RF (NanoRF)
approach can integrate proteomics data to uncover subtle protein relationships.
Our NanoRF pipeline is available online.