Journal
PROTEIN SCIENCE
Volume 16, Issue 1, Pages 30-42Publisher
COLD SPRING HARBOR LAB PRESS, PUBLICATIONS DEPT
DOI: 10.1110/ps.062558507
Keywords
ITC; multiprotein complexes; cooperativity; signal transduction; adaptor protein; Sos1; LAT; Grb2; protein interactions; reversible associations
Categories
Funding
- NATIONAL INSTITUTE OF BIOMEDICAL IMAGING AND BIOENGINEERING [ZIAEB000050, Z01EB000008, ZICEB000008, ZIAEB000008, Z01EB000050] Funding Source: NIH RePORTER
- OFFICE OF THE DIRECTOR, NATIONAL INSTITUTES OF HEALTH [Z01OD010485] Funding Source: NIH RePORTER
- NIH HHS [Z01 OD010485-08] Funding Source: Medline
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Multisite interactions and the formation of ternary or higher-order protein complexes are ubiquitous features of protein interactions. Cooperativity between different ligands is a hallmark for information transfer, and is frequently critical for the biological function. We describe a new computational platform for the global analysis of isothermal titration calorimetry (ITC) data for the study of binary and ternary multisite interactions, implemented as part of the public domain multimethod analysis software SEDPHAT. The global analysis of titrations performed in different orientations was explored, and the potential for unraveling cooperativity parameters in multisite interactions was assessed in theory and experiment. To demonstrate the practical potential and limitations of global analyses of ITC titrations for the study of cooperative multiprotein interactions, we have examined the interactions of three proteins that are critical for signal transduction after T-cell activation, LAT, Grb2, and Sos1. We have shown previously that multivalent interactions between these three molecules promote the assembly of large multiprotein complexes important for T-cell receptor activation. By global analysis of the heats of binding observed in sets of ITC injections in different orientations, which allowed us to follow the formation of binary and ternary complexes, we observed negative and positive cooperativity that may be important to control the pathway of assembly and disassembly of adaptor protein particles.
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