ISDA

Entry Detail

PDB ID:

5U66

Keywords:

immune system/inhibitor

Title:

Modified single helix from the B-domain of protein A bound to IgG1 Fc

Biological Source:

Source Organism:

Homo sapiens, Staphylococcus aureus

Host Organism:

Cricetulus griseus

PDB Version:

Deposition Date:

2016-12-07

Release Date:

2017-05-24

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.70 Å

R-Value Free:

0.22

R-Value Work:

0.15

R-Value Observed:

0.16

Space Group:

C 2 2 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:IgG1 fc derived from CD4-fc fusion
Chain IDs:B (auth: A)
Chain Length:207
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:P01857 Pfam ID:PF07654

Polymer Type:polypeptide(L)
Description:STAPLED PEPTIDE FROM DOMAIN B OF PROTEIN A
Chain IDs:A (auth: B)
Chain Length:15
Number of Molecules:1
Biological Source:Staphylococcus aureus

Peptide-like Molecules

PRD_002261

Primary Citation

3-2-1: Structural insights from stepwise shrinkage of a three-helix Fc-binding domain to a single helix.

Ultsch, M, Braisted, A, Maun, H.R, Eigenbrot, C.Show

Protein Eng. Des. Sel. 30 619 625 (2017)

PMID: 28475752 DOI: 10.1093/protein/gzx029

Abstact

The well-studied B-domain from Staphylococcal protein A is a 59 amino acid three-helix bundle that binds the Fc portion of IgG with a dissociation constant of ~35 nM. The B-domain variant bearing a Gly to Ala mutation (=Z-domain) has been the subject of efforts to minimize a domain's size while retaining its function. We report X-ray crystallographic characterization of three steps in such a process using complexes with Fc: the full three-helix Z-domain, a 34 amino acid two-helix version called Z34C and a 13 amino acid single helix stabilized with an exo-helix tether, called LH1.

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Primary Citation of related structures