Heparin Binds to the Laminin α4 Chain LG4 Domain at a Site Different from that Found for Other Laminins

  • Yamashita H
  • Beck K
  • Kitagawa Y
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Abstract

We previously reported that the LG4 domain of the laminin α4 chain is responsible for high-affinity heparin binding. To specify the amino acid residues involved in this activity, we produced a series of α4 LG4-fusion proteins in which each of the 27 basic residues (arginine, R; histidine; lysine, K) were replaced one by one with alanine (A). When the effective residues R1520A, K1531A, K1533A, and K1539A are mapped on a structural model, they form a track on the concave surface of the β-sandwich, suggesting that they interact with adjacent sulfate groups along the heparin chain. Whereas low-affinity heparin-binding sites of other LG domains have been located at the top of the β-sheet sandwich opposite the N and C termini, the residues for high-affinity heparin binding of α4 LG4 reveal a new topological area of the LG module. © 2003 Elsevier Ltd. All rights reserved.

Author-supplied keywords

  • Basement membrane
  • Heparin
  • LG module
  • Laminin
  • Mutagenesis

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Authors

  • Hironobu Yamashita

  • Konrad Beck

  • Yasuo Kitagawa

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