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Structural basis of cholesterol binding by a novel clade of dendritic cell modulators from ticks.


ABSTRACT: Two crystal structures of Japanin, an 18?kDa immune-modulatory lipocalin from the Brown Ear Tick (Rhipicephalus appendiculatus), have been determined at 2.2 and 2.4?Å resolution. In both crystal forms the protein is in complex with cholesterol, which sits in a closed pocket at the centre of the lipocalin barrel. Both crystal forms are dimers, which are also observed in solution. Molecular modelling suggests that previously-described members of a tick protein family bearing high sequence homology to Japanin are also likely to bind cholesterol or cholesterol derivatives.

SUBMITTER: Roversi P 

PROVIDER: S-EPMC5700055 | biostudies-literature | 2017 Nov

REPOSITORIES: biostudies-literature

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Structural basis of cholesterol binding by a novel clade of dendritic cell modulators from ticks.

Roversi Pietro P   Johnson Steven S   Preston Stephen G SG   Nunn Miles A MA   Paesen Guido C GC   Austyn Jonathan M JM   Nuttall Patricia A PA   Lea Susan M SM  

Scientific reports 20171122 1


Two crystal structures of Japanin, an 18 kDa immune-modulatory lipocalin from the Brown Ear Tick (Rhipicephalus appendiculatus), have been determined at 2.2 and 2.4 Å resolution. In both crystal forms the protein is in complex with cholesterol, which sits in a closed pocket at the centre of the lipocalin barrel. Both crystal forms are dimers, which are also observed in solution. Molecular modelling suggests that previously-described members of a tick protein family bearing high sequence homology  ...[more]

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