Three-Dimensional Structure of Fab Fragment of Monoclonal Antibody LNKB-2 Complexed with Antigenic Nonaptide from Human Interleukin-2

E. A. Goryacheva; Горячева Е. А.; I. V. Artemyev; Артемьев И. В.; N. V. Pletnevа; Плетнева Н. В.; V. Z. Pletnev; Плетнев В. З.

doi:10.31857/S0132342323010098

Three-Dimensional Structure of Fab Fragment of Monoclonal Antibody LNKB-2 Complexed with Antigenic Nonaptide from Human Interleukin-2

Autores: Goryacheva E.¹, Artemyev I.¹, Pletnevа N.¹, Pletnev V.¹
Afiliações:
1. Shemyakin–Ovchinnikov Institute of Bioorganic Chemistry of the Russian Academy of Sciences
Edição: Volume 49, Nº 3 (2023)
Páginas: 285-290
Seção: Articles
URL: https://journals.rcsi.science/0132-3423/article/view/139151
DOI: https://doi.org/10.31857/S0132342323010098
EDN: https://elibrary.ru/GFDHZS
ID: 139151

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Resumo

The three-dimensional structure of the antigen-binding fragment (Fab) of the monoclonal antibody LNKB-2 in complex with the synthetic antigenic nonapeptide of human interleukin-2 (IL-2; Lys-Pro-Leu-Glu-Glu-Val-Leu-Asn-Leu-O) was determined by X-ray method at a resolution of 2.6 Å in crystal space group P2₁2₁2₁. The peptide adopts a somewhat distorted α-helical conformation, close to that of fragment 64–72 of the IL-2 antigen. Four out of the six hypervariable loops in the antigen-binding site of the Fab fragment are involved in nonapeptide association through hydrogen bonding, salt bridge formation, and hydrophobic interactions. Moreover, Tyr residues of an antibody play an important role in antigen-antibody recognition.

Palavras-chave

monoclonal antibody, Fab fragment, interleukin-2 antigen, three-dimensional structure, X-ray study

Bibliografia

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