6OQ9

Solution structure of VEK50 in the bound form with plasminogen kringle 2

Summary for 6OQ9

• Entry DOI: 10.2210/pdb6oq9/pdb
• NMR Information: BMRB: 30603
• Descriptor: Plasminogen-binding group A streptococcal M-like protein PAM (1 entity in total)
• Functional Keywords: plasminogen binding peptide, blood clotting, protein binding
• Biological source: Streptococcus pyogenes
• Total number of polymer chains: 1
• Total formula weight: 6173.79

Authors

Yuan, Y.,Castellino, F.J. (deposition date: 2019-04-25, release date: 2019-07-24, Last modification date: 2024-05-15)

Primary citation

Yuan, Y.,Ayinuola, Y.A.,Singh, D.,Ayinuola, O.,Mayfield, J.A.,Quek, A.,Whisstock, J.C.,Law, R.H.P.,Lee, S.W.,Ploplis, V.A.,Castellino, F.J.
Solution structural model of the complex of the binding regions of human plasminogen with its M-protein receptor from Streptococcus pyogenes.
J.Struct.Biol., 208:18-29, 2019

PubMed Abstract: VEK50 is a truncated peptide from a Streptococcal pyogenes surface human plasminogen (hPg) binding M-protein (PAM). VEK50 contains the full A-domain of PAM, which is responsible for its low nanomolar binding to hPg. The interaction of VEK50 with kringle 2, the PAM-binding domain in hPg (K2), has been studied by high-resolution NMR spectroscopy. The data show that each VEK50 monomer in solution contains two tight binding sites for K2, one each in the a1- (RH1; RH) and a2- (RH2; RH) repeats within the A-domain of VEK50. Two mutant forms of VEK50, viz., VEK50[RH1/AA] (VEK50) and VEK50[RH2/AA] (VEK50), were designed by replacing each RH with AA, thus eliminating one of the K2 binding sites within VEK50, and allowing separate study of each binding site. Using C- and N-labeled peptides, NMR-derived solution structures of VEK50 in its complex with K2 were solved. We conclude that the A-domain of PAM can accommodate two molecules of K2 docked within a short distance of each other, and the strength of the binding is slightly different for each site. The solution structure of the VEK50/K2, complex, which is a reductionist model of the PAM/hPg complex, provides insights for the binding mechanism of PAM to a host protein, a process that is critical to S. pyogenes virulence.

PubMed: 31301349
DOI: 10.1016/j.jsb.2019.07.005

Experimental method

SOLUTION NMR