1PTS

CRYSTAL STRUCTURE AND LIGAND BINDING STUDIES OF A SCREENED PEPTIDE COMPLEXED WITH STREPTAVIDIN

Summary for 1PTS

• Entry DOI: 10.2210/pdb1pts/pdb
• Descriptor: STREPTAVIDIN, PEPTIDE (FSHPQNT) (3 entities in total)
• Functional Keywords: glycoprotein, biotin-binding protein-peptide complex, biotin-binding protein/peptide
• Biological source: Streptomyces avidinii
• Total number of polymer chains: 3
• Total formula weight: 26308.32

Authors

Weber, P.C.,Pantoliano, M.W.,Thompson, L.D. (deposition date: 1992-07-23, release date: 1994-01-31, Last modification date: 2024-02-14)

Primary citation

Weber, P.C.,Pantoliano, M.W.,Thompson, L.D.
Crystal structure and ligand-binding studies of a screened peptide complexed with streptavidin.
Biochemistry, 31:9350-9354, 1992

PubMed Abstract: The thermodynamic binding parameters and crystal structure for streptavidin-peptide complexes where the peptide sequences were obtained by random screening methods are reported. The affinities between streptavidin and two heptapeptides were determined by titrating calorimetric methods [Phe-Ser-His-Pro-Gln-Asn-Thr, Ka = 7944 (+/- 224) M-1, delta G degrees = -5.32 (+/- 0.01) kcal/mol, and delta H degrees = -19.34 (+/- 0.48) kcal/mol; His-Asp-His-Pro-Gln-Asn-Leu, Ka = 3542 (+/- 146) M-1, delta G degrees = -4.84 (+/- 0.03) kcal/mol, and delta H degrees = -19.00 (+/- 0.64) kcal/mol]. The crystal structure of streptavidin complexed with one of these peptides has been determined at 2.0-A resolution. The peptide (Phe-Ser-His-Pro-Gln-Asn-Thr) binds in a turn conformation with the histidine, proline, and glutamine side chains oriented inward at the biotin-binding site. A water molecule is immobilized between the histidine and glutamine side chains of the peptide and an aspartic acid side chain of the protein. Although some of the residues that participate in binding biotin also interact with the screened peptide, the peptide adopts an alternate method of utilizing binding determinants in the biotin-binding site of streptavidin.

PubMed: 1390720
DOI: 10.1021/bi00154a004

Experimental method

X-RAY DIFFRACTION (2 Å)