RCSB PDB - 1TMR: THE STRUCTURE OF A 19 RESIDUE FRAGMENT FROM THE C-LOOP OF THE FOURTH EPIDERMAL GROWTH FACTOR-LIKE DOMAIN OF THROMBOMODULIN (original) (raw)
The structure of a 19-residue fragment from the C-loop of the fourth epidermal growth factor-like domain of thrombomodulin.
[Adler, M.](/search?q=citation.rcsb%5Fauthors:Adler, M.), [Seto, M.H.](/search?q=citation.rcsb%5Fauthors:Seto, M.H.), [Nitecki, D.E.](/search?q=citation.rcsb%5Fauthors:Nitecki, D.E.), [Lin, J.H.](/search?q=citation.rcsb%5Fauthors:Lin, J.H.), [Light, D.R.](/search?q=citation.rcsb%5Fauthors:Light, D.R.), [Morser, J.](/search?q=citation.rcsb%5Fauthors:Morser, J.)
(1995) J Biol Chem 270: 23366-23372
PubMed: 7559494 Search on PubMed
PubMed Abstract:
The solution structure has been determined for a 19-residue peptide that is fully folded at room temperature. The sequence of this peptide is based on the C-loop, residues 371-389, of the fourth epidermal growth factor-like domain of thrombomodulin, a protein that acts as a cofactor for the thrombin activation of protein C. Despite its small size, the peptide forms a compact structure with almost no repeating secondary structure. The results indicate the structure is held together by hydrophobic interactions, which in turn stabilize the two beta-turns in the structure. The first beta-turn in the C-loop represents a conserved motif that is found in the published structures of five other epidermal growth factor-like proteins. The critical role of Phe376 in the stabilization of the first beta-turn is consistent with mutagenesis data with soluble thrombomodulin. The results also show that a small subdomain of a larger protein can fold independently, and therefore it could act as an initiation site for further folding.
Organizational Affiliation:
Berlex Bioscience, Inc., Richmond, California 94804-0099, USA.