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Structure-guided identification of a laminin binding site on the laminin receptor precursor.

Abstract：

:The 37/ 67-kDa human laminin receptor (LamR) is a cell surface receptor for laminin, prion protein, and a variety of viruses. Because of its wide range of ligands, LamR plays a role in numerous pathologies. LamR overexpression correlates with a highly invasive cell phenotype and increased metastatic ability, mediated by interactions between LamR and laminin. In addition, the specific targeting of LamR with small interfering RNAs, blocking antibodies, and Sindbis viral vectors confers anti-tumor effects. We adopted a structure-based approach to map a laminin binding site on human LamR by comparing the sequences and crystal structures of LamR and Archaeoglobus fulgidus S2p, a non-laminin-binding ortholog. Here, we identify a laminin binding site on LamR, comprising residues Phe32, Glu35, and Arg155, which are conserved among mammalian species. Mutation of these residues results in a significant loss of laminin binding. Further, recombinant wild-type LamR is able to act as a soluble decoy to inhibit cellular migration towards laminin. Mutation of this laminin binding site results in loss of migration inhibition, which demonstrates the physiological role of Phe32, Glu35, and Arg155 for laminin binding activity. Mapping of the LamR binding site should contribute to the development of therapeutics that inhibit LamR interactions with laminin and may aid in the prevention of tumor growth and metastasis.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Jamieson KV,Hubbard SR,Meruelo D

doi

10.1016/j.jmb.2010.10.028

subject

Has Abstract

pub_date

2011-01-07 00:00:00

pages

24-32

issue

1

eissn

0022-2836

issn

1089-8638

pii

S0022-2836(10)01145-9

journal_volume

405

pub_type

杂志文章,评审

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