Comparison of SH3 and SH2 domain dynamics when expressed alone or in an SH(3 + 2) construct: the role of protein dynamics in functional regulation

Protein dynamics play an important role in protein function and regulation of enzymatic activity. To determine how additional interactions with surrounding structure affects local protein dynamics, we have used hydrogen exchange and mass spectrometry to investigate the SH2 and SH3 domains of the pro...

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Bibliographic Details
Published in:Journal of molecular biology 1999-04, Vol.287 (3), p.645-656
Main Authors: Engen, John R, Smithgall, Thomas E, Gmeiner, William H, Smith, David L
Format: Article
Language:English
Subjects:
Amino Acid Sequence
Deuterium
hematopoietic cell kinase (Hck)
Humans
Hydrogen
hydrogen exchange
Mass Spectrometry
Models, Molecular
Molecular Sequence Data
Peptide Fragments - chemistry
Peptide Fragments - genetics
Protein Conformation
Protein Folding
Protein Structure, Tertiary
Protein-Tyrosine Kinases - chemistry
Protein-Tyrosine Kinases - genetics
Proto-Oncogene Proteins - chemistry
Proto-Oncogene Proteins - genetics
Proto-Oncogene Proteins c-hck
SH2
SH3
src Homology Domains - genetics
Thermodynamics
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Summary:Protein dynamics play an important role in protein function and regulation of enzymatic activity. To determine how additional interactions with surrounding structure affects local protein dynamics, we have used hydrogen exchange and mass spectrometry to investigate the SH2 and SH3 domains of the protein tyrosine kinase Hck. Exchange rates of isolated Hck SH3 and SH2 domains were compared with rates for the same domains when part of a larger SH(3 + 2) construct. Increased deuterium incorporation was observed for the SH3 domain in the joint construct, particularly near the SH2 interface and the short sequence that connects SH3 to SH2, implying greater flexibility of SH3 when it is part of SH(3 + 2). Slow cooperative unfolding of the SH3 domain occurred at the same rate in isolated SH3 as in the SH(3 + 2) construct, suggesting a functional significance for this unfolding. The SH2 domain displayed relatively smaller changes in flexibility when part of the SH(3 + 2) construct. These results suggest that the domains influence each other. Further, our results imply a link between functional regulation and structural dynamics of SH3 and SH2 domains.
ISSN:0022-2836
1089-8638
DOI:10.1006/jmbi.1999.2619