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논문 기본 정보

자료유형
학술저널
저자정보
Dolgorsuren Buyannemekh (강원대학교) 남상욱 (강원대학교)
저널정보
한국분자세포생물학회 Molecules and Cells Molecules and Cells 제40권 제5호
발행연도
2017.5
수록면
355 - 362 (8page)

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The 2 integrins are cell surface transmembrane proteins regulating leukocyte functions, such as adhesion and migration. Two members of 2 integrin, M 2 and X 2, share the leukocyte distribution profile and integrin X 2 is involved in antigen presentation in dendritic cells and transendothelial migration of monocytes and macrophages to atherosclerotic lesions. Receptor for advanced glycation end products (RAGE), a member of cell adhesion molecules, plays an important role in chronic inflammation and atherosclerosis. Although RAGE and X 2 play an important role in inflammatory response and the pathogenesis of atherosclerosis, the nature of their interaction and structure involved in the binding remain poorly defined. In this study, using I-domain as a ligand binding motif of X 2, we characterize the binding nature and the interacting moieties of X I-domain and RAGE. Their binding requires divalent cations (Mg2+ and Mn2+) and shows an affinity on the sub-micro molar level: the dissociation constant of X I-domains binding to RAGE being 0.49 μM. Furthermore, the X I-domains recognize the V-domain, but not the C1 and C2-domains of RAGE. The acidic amino acid substitutions on the ligand binding site of X I-domain significantly reduce the I-domain binding activity to soluble RAGE and the alanine substitutions of basic amino acids on the flat surface of the V-domain prevent the V-domain binding to X I-domain. In conclusion, the main mechanism of X I-domain binding to RAGE is a charge interaction, in which the acidic moieties of X I-domains, including E244, and D249, recognize the basic residues on the RAGE V-domain encompassing K39, K43, K44, R104, and K107.

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