1V1O

staphylococcal superantigen-like protein 7

1V1O の概要

• エントリーDOI: 10.2210/pdb1v1o/pdb
• 関連するPDBエントリー: 1V1P
• 分子名称: EXOTOXIN 1 (2 entities in total)
• 機能のキーワード: virulence factor, antigen presenting cell, secreted protein, staphylococcal exotoxin 1, set1
• 由来する生物種: STAPHYLOCOCCUS AUREUS
• タンパク質・核酸の鎖数: 2
• 化学式量合計: 48956.71

構造登録者

Naylor, C.E.,Briggs, D.C.,Nair, S.P.,Al-Shangiti, A.M. (登録日: 2004-04-21, 公開日: 2004-07-01, 最終更新日: 2023-12-13)

主引用文献

Al-Shangiti, A.M.,Naylor, C.E.,Nair, S.P.,Briggs, D.C.,Henderson, B.,Chain, B.
Structural Relationships and Cellular Tropism of Staphylococcal Superantigen-Like Proteins
Infect.Immun., 72:4261-, 2004

PubMed Abstract: The staphylococcal superantigen-like proteins (SSLs) are a family of polymorphic paralogs encoded in the Staphylococcus aureus genome whose function is unknown. The crystal structure of SSL7 was determined and compared to that of SSL5 and that of a classical superantigen, streptococcal pyrogenic exotoxin. Although the overall architecture of the superantigen family is retained in both SSL7 and SSL5, there are significant differences in the structures which suggest that the characteristic major histocompatibility complex binding site of superantigens has been lost. To complement these data, the abilities of SSL7 and a closely related paralog, SSL9, to interact with cells of the immune system were investigated. In populations of human white blood cells, both SSLs interacted selectively with monocytes via specific saturable but separate binding sites, which led to rapid uptake of the SSLs. In addition, SSLs were rapidly taken up by dendritic cells, but not by macrophages, into the same endosomal compartment as dextran. The ability of these secreted proteins to target antigen-presenting cells may enhance a misplaced antibody response against the proteins, which may facilitate bacterial colonization rather than contribute to host protection. Like classical superantigens, therefore, SSLs may distract the host's immune system, but they may do so via entirely different molecular mechanisms.

PubMed: 15213171
DOI: 10.1128/IAI.72.7.4261-4270.2004

実験手法

X-RAY DIFFRACTION (2.75 Å)