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Complex Networks Govern Coiled-Coil Oligomerization – Predicting and Profiling by Means of a Machine Learning Approach*

By Carsten C. Mahrenholz, Ingrid G. Abfalter, Ulrich Bodenhofer, Rudolf Volkmer and Sepp Hochreiter

Abstract

Understanding the relationship between protein sequence and structure is one of the great challenges in biology. In the case of the ubiquitous coiled-coil motif, structure and occurrence have been described in extensive detail, but there is a lack of insight into the rules that govern oligomerization, i.e. how many α-helices form a given coiled coil. To shed new light on the formation of two- and three-stranded coiled coils, we developed a machine learning approach to identify rules in the form of weighted amino acid patterns. These rules form the basis of our classification tool, PrOCoil, which also visualizes the contribution of each individual amino acid to the overall oligomeric tendency of a given coiled-coil sequence. We discovered that sequence positions previously thought irrelevant to direct coiled-coil interaction have an undeniable impact on stoichiometry. Our rules also demystify the oligomerization behavior of the yeast transcription factor GCN4, which can now be described as a hybrid—part dimer and part trimer—with both theoretical and experimental justification

Topics: Regular Issue
Publisher: The American Society for Biochemistry and Molecular Biology
OAI identifier: oai:pubmedcentral.nih.gov:3098589
Provided by: PubMed Central
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