Synthesis, folding, and structure of the beta-turn mimic modified B1 domain of streptococcal protein G.


The mechanism of beta-sheet formation remains a fundamental issue in our understanding of the protein folding process, but is hampered by the often encountered kinetic competition between folding and aggregation. The role of local versus nonlocal interactions has been probed traditionally by mutagenesis of both turn and strand residues. Recently, rigid organic molecules that impose a correct chain reversal have been introduced in several small peptides to isolate the importance of the long-range interactions. Here, we present the incorporation of a well-studied beta-turn mimic, designated as the dibenzofuran-based (DBF) amino acid, in the B1 domain of streptococcal protein G (B1G), and compare our results with those obtained upon insertion of the same mimic into the N-terminal beta-hairpin of B1G (O Melnyk et al., 1998, Lett Pept Sci 5:147-150). The DBF-B1G domain conserves the structure and the functional and thermodynamical properties of the native protein, whereas the modified peptide does not adopt a native-like conformation. The nature of the DBF flanking residues in the modified B1G domain prevents the beta-turn mimic from acting as a strong beta-sheet nucleator, which reinforces the idea that the native beta-hairpin formation is not driven by the beta-turn formation, but by tertiary interactions. Study holds ProTherm entries: 6851, 6852, 6853, 6854 Extra Details: B1G: B1 domain of the streptococcus protein G

Submission Details

ID: iAgmsLc23

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:32 p.m.

Version: 1

Publication Details
Odaert B;Jean F;Boutillon C;Buisine E;Melnyk O;Tartar A;Lippens G,Protein Sci. (1999) Synthesis, folding, and structure of the beta-turn mimic modified B1 domain of streptococcal protein G. PMID:10631995
Additional Information

Structure view and single mutant data analysis

Study data

No weblogo for data of varying length.
Colors: D E R H K S T N Q A V I L M F Y W C G P

Data Distribution

Studies with similar sequences (approximate matches)

Correlation with other assays (exact sequence matches)

Relevant UniProtKB Entries

Percent Identity Matching Chains Protein Accession Entry Name
100.0 Immunoglobulin G-binding protein G P06654 SPG1_STRSG
100.0 Immunoglobulin G-binding protein G P19909 SPG2_STRSG