» Articles » PMID: 31791173

The Impact of Proline Isomerization on Antigen Binding and the Analytical Profile of a Trispecific Anti-HIV Antibody

Abstract

Proline conformational isomerization is a mechanism that affects different types of protein functions and behaviors. Using analytical characterization, structural analysis, and molecular dynamics simulations, we studied the causes of an aberrant two-peak size-exclusion chromatography profile observed for a trispecific anti-HIV antibody. We found that proline isomerization in the tyrosine-proline-proline (YPP) motif in the heavy chain complementarity-determining region (CDR)3 domain of one of the antibody arms (10e8v4) was a component of this profile. The pH effect on the conformational equilibrium that led to these two populations was presumably caused by a histidine residue (H147) in the light chain that is in direct contact with the YPP motif. Finally, we demonstrated that, due to chemical equilibrium between the and proline conformers, the antigen-binding potency of the trispecific anti-HIV antibody was not significantly affected in spite of a potential structural clash of 10e8v4 YPP conformers with the membrane-proximal ectodomain region epitope in the GP41 antigen. Altogether, these results reveal at mechanistic and molecular levels the effect of proline isomerization in the CDR on the antibody binding and analytical profiles, and support further development of the trispecific anti-HIV antibody.

Citing Articles

The functionality of a therapeutic antibody candidate restored by a single mutation from proline to threonine in the variable region.

Hautiere M, Maffucci I, Costa N, Herbet A, Essono S, Padiolleau-Lefevre S Hum Vaccin Immunother. 2023; 19(3):2279867.

PMID: 38012091 PMC: 10760395. DOI: 10.1080/21645515.2023.2279867.


Combination of IM-Based Approaches to Unravel the Coexistence of Two Conformers on a Therapeutic Multispecific mAb.

Desligniere E, Ollivier S, Ehkirch A, Martelet A, Ropartz D, Lechat N Anal Chem. 2022; 94(22):7981-7989.

PMID: 35604400 PMC: 9178554. DOI: 10.1021/acs.analchem.2c00928.


An Unbound Proline-Rich Signaling Peptide Frequently Samples Conformations in Gaussian Accelerated Molecular Dynamics Simulations.

Alcantara J, Stix R, Huang K, Connor A, East R, Jaramillo-Martinez V Front Mol Biosci. 2021; 8:734169.

PMID: 34869581 PMC: 8634643. DOI: 10.3389/fmolb.2021.734169.


Roles of key residues and lipid dynamics reveal pHLIP-membrane interactions at intermediate pH.

Otieno S, Qiang W Biophys J. 2021; 120(21):4649-4662.

PMID: 34624273 PMC: 8595900. DOI: 10.1016/j.bpj.2021.10.001.


Structures of HIV-1 Neutralizing Antibody 10E8 Delineate the Mechanistic Basis of Its Multi-Peak Behavior on Size-Exclusion Chromatography.

Kwon Y, Wang X, Bender M, Yang R, Li Y, McKee K Antibodies (Basel). 2021; 10(2).

PMID: 34200826 PMC: 8293163. DOI: 10.3390/antib10020023.


References
1.
Nath P, Isakov N . Insights into peptidyl-prolyl cis-trans isomerase structure and function in immunocytes. Immunol Lett. 2014; 163(1):120-31. DOI: 10.1016/j.imlet.2014.11.002. View

2.
Humphrey W, Dalke A, Schulten K . VMD: visual molecular dynamics. J Mol Graph. 1996; 14(1):33-8, 27-8. DOI: 10.1016/0263-7855(96)00018-5. View

3.
Reimer U, Scherer G, Drewello M, Kruber S, Schutkowski M, Fischer G . Side-chain effects on peptidyl-prolyl cis/trans isomerisation. J Mol Biol. 1998; 279(2):449-60. DOI: 10.1006/jmbi.1998.1770. View

4.
Chen Y, Wu Y, Yang H, Li X, Jie M, Hu C . Prolyl isomerase Pin1: a promoter of cancer and a target for therapy. Cell Death Dis. 2018; 9(9):883. PMC: 6115400. DOI: 10.1038/s41419-018-0844-y. View

5.
Nicholson L, Lu K . Prolyl cis-trans Isomerization as a molecular timer in Crk signaling. Mol Cell. 2007; 25(4):483-5. DOI: 10.1016/j.molcel.2007.02.005. View