6WIR

Fab antigen complex

Summary for 6WIR

• Entry DOI: 10.2210/pdb6wir/pdb
• Descriptor: Fab heavy chain, Fab light chain, Interleukin-17A, ... (4 entities in total)
• Functional Keywords: fab, il-17, cytokine, cytokine-immune system complex, cytokine/immune system
• Biological source: Homo sapiens (Human); More
• Total number of polymer chains: 3
• Total formula weight: 67578.69

Authors

Antonysamy, S. (deposition date: 2020-04-10, release date: 2020-09-23, Last modification date: 2024-10-23)

Primary citation

Lieu, R.,Antonysamy, S.,Druzina, Z.,Ho, C.,Kang, N.R.,Pustilnik, A.,Wang, J.,Atwell, S.
Rapid and robust antibody Fab fragment crystallization utilizing edge-to-edge beta-sheet packing.
Plos One, 15:e0232311-e0232311, 2020

PubMed Abstract: Antibody therapeutics are one of the most important classes of drugs. Antibody structures have become an integral part of predicting the behavior of potential therapeutics, either directly or as the basis of modeling. Structures of Fab:antigen complexes have even greater value. While the crystallization and structure determination of Fabs is easy relative to many other protein classes, especially membrane proteins, broad screening and optimization of crystalline hits is still necessary. Through a comprehensive review of rabbit Fab crystal contacts and their incompatibility with human Fabs, we identified a small secondary structural element from the rabbit light chain constant domain potentially responsible for hindering the crystallization of human Fabs. Upon replacing the human kappa constant domain FG loop (HQGLSSP) with the two residue shorter rabbit loop (QGTTS), we dramatically improved the crystallization of human Fabs and Fab:antigen complexes. Our design, which we call "Crystal Kappa", enables rapid crystallization of human fabs and fab complexes in a broad range of conditions, with less material in smaller screens or from dilute solutions.

PubMed: 32915778
DOI: 10.1371/journal.pone.0232311

Experimental method

X-RAY DIFFRACTION (2.96 Å)