Integrin binding characteristics of the disintegrin-like domain of ADAM-15

Dong Lu; Kian Fan Chung; Min Xia; Xinjie Lu; Mike Scully; Vijay Kakkar

doi:10.1160/TH06-07-0395

Thrombosis and Haemostasis, Table of Contents

Thromb Haemost 2006; 96(05): 642-651
DOI: 10.1160/TH06-07-0395

Platelets and Blood Cells

Schattauer GmbH

Integrin binding characteristics of the disintegrin-like domain of ADAM-15

Dong Lu

¹Thrombosis Research Institute, Manresa Road, London, UK

,

Kian Fan Chung

²National Heart and Lung Institute, Imperial College, Dovehouse Street, London, UK

,

Min Xia

¹Thrombosis Research Institute, Manresa Road, London, UK

,

Xinjie Lu

¹Thrombosis Research Institute, Manresa Road, London, UK

,

Mike Scully

¹Thrombosis Research Institute, Manresa Road, London, UK

,

Vijay Kakkar

¹Thrombosis Research Institute, Manresa Road, London, UK

› Author Affiliations

Abstract

Summary

Although discovered as potent inhibitors of α_IIbβ₃-mediated platelet aggregation, snake venom disintegrins are now known to bind to other integrins according to different degrees of potency and specificity. More recently, homologues of the disintegrinlike loop have been found as a discrete domain in the ADAM family, yet the potency and specificity of each of these domains in terms of integrin binding is relatively unknown. In this present study, we have selected the disintegrin-like domain (dd) of ADAM-15 (designated as ddADAM-15), the only RGD containing domain in the ADAM family, for a structure/function study. Experimentally, the ddADAM-15 and a number of mutants in which the RGD-containing loop was substituted by cognate regions from ADAM-2, -12 and -19 were tested in terms of integrin-binding activity. For comparison with ADAM-15, an additional mutant (dd^denADAM-15) was designed based upon the RGD-containing loop of snake venom dendroaspin, a disintegrin-like integrin antagonist. The results showed that ddADAM-15 is an inhibitor of platelet aggregation, though with less potency than dd^denADAM-15. None of the other mutants exhibited significant inhibition of platelet aggregation. ddADAM-15 was found to have higher binding ability for α₂β₁ and α₉β₁ than the ADAM-2 derived mutant which appeared to be more selective for α_Vβ₃ and α₄β₁ than either ddADAM-15 or its ADAM-19 based mutant. The integrin-binding properties of ddADAM-15 were completely abolished by point mutation within the RGD motif (R⁶⁴GD→A⁶⁴GD). These results suggest a more subtle contribution of this loop sequence to defining the functionality of the ADAMs compared to dendroaspin.

Keywords

Integrin - ADAM protein - disintegrin - disintegrin-like domain - cell adhesion - RGD-motif

Full Text

References

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