| Autor: |
Vattekatte AM; Université de Paris, INSERM, BIGR, F-75014 Paris, France.; Université de la Réunion, INSERM, BIGR, F-97715 Saint-Denis, France., Diharce J; Université de Paris, INSERM, BIGR, F-75014 Paris, France., Rebehmed J; Department of Computer Science and Mathematics, Lebanese American University, Beirut 1102 2801, Lebanon., Cadet F; Université de la Réunion, INSERM, BIGR, F-97715 Saint-Denis, France.; Artificial Intelligence Department, PEACCEL, Square Albin Cachot, F-75013 Paris, France., Gardebien F; Université de la Réunion, INSERM, BIGR, F-97715 Saint-Denis, France., Etchebest C; Université de Paris, INSERM, BIGR, F-75014 Paris, France., de Brevern AG; Université de Paris, INSERM, BIGR, F-75014 Paris, France.; Université de la Réunion, INSERM, BIGR, F-97715 Saint-Denis, France. |
| Abstrakt: |
Conformational flexibility plays an essential role in antibodies' functional and structural stability. They facilitate and determine the strength of antigen-antibody interactions. Camelidae express an interesting subtype of single-chain antibody, named Heavy Chain only Antibody. They have only one N-terminal Variable domain (V H H) per chain, composed of Frameworks (FRs) and Complementarity Determining regions (CDRs) like their VH and VL counterparts in IgG. Even when expressed independently, V H H domains display excellent solubility and (thermo)stability, which helps them to retain their impressive interaction capabilities. Sequence and structural features of V H H domains contributing to these abilities have already been studied compared to classical antibodies. To have the broadest view and understand the changes in dynamics of these macromolecules, large-scale molecular dynamics simulations for a large number of non-redundant V H H structures have been performed for the first time. This analysis reveals the most prevalent movements in these domains. It reveals the four main classes of V H Hs dynamics. Diverse local changes were observed in CDRs with various intensities. Similarly, different types of constraints were observed in CDRs, while FRs close to CDRs were sometimes primarily impacted. This study sheds light on the changes in flexibility in different regions of V H H that may impact their in silico design. |
