Section 12
Chapter 11,411

Structure of the insect cytokine peptide plasmatocyte-spreading peptide 1 from Pseudoplusia includens

Volkman, B.F.; Anderson, M.E.; Clark, K.D.; Hayakawa, Y.; Strand, M.R.; Markley, J.L.

Journal of Biological Chemistry 274(8): 4493-4496


ISSN/ISBN: 0021-9258
PMID: 9988679
DOI: 10.1074/jbc.274.8.4493
Accession: 011410357

The structure of the recently identified plasmatocyte spreading peptide from the moth Pseudoplusia includens (PSP1) has been determined by NMR spectroscopy. This novel insect cytokine consists of 23 amino acid residues and a single disulfide bond. Torsion angle dynamics calculations utilizing a total of 337 distance constraints yielded an ensemble of 30 structures with an average backbone root mean square deviation for residues 7-22 of 0.18 ANG from the mean structure. The structure consists of a disordered N-terminal region and a well defined core that is stabilized by numerous hydrophobic interactions and a short beta-hairpin. Structural comparisons confirm that PSP1 adopts an epidermal growth factor (EGF)-like fold with close similarity to the C-terminal subdomain of EGF-like module 5 of human thrombomodulin. The combination of the three-dimensional structure of PSP1 and the extensive literature on EGF-receptor interactions should accelerate the process of identifying the specific residues responsible for receptor binding activity of this family of immunoregulatory peptides.

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