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The beta-tail domain (betaTD) regulates physiologic ligand binding to integrin CD11b/CD18.

Abstract：

:Crystallographic and electron microscopy studies revealed genuflexed (bent) integrins in both unliganded (inactive) and physiologic ligandbound (active) states, suggesting that local conformational changes are sufficient for activation. Herein we have explored the role of local changes in the contact region between the membrane-proximal beta-tail domain (betaTD) and the ligand-binding betaA domain of the bent conformation in regulating interaction of integrin CD11b/CD18 (alphaMbeta2) with its physiologic ligand iC3b. We replaced the betaTD CD loop residues D658GMD of the CD18 (beta2) subunit with the equivalent D672SSG of the beta3 subunit, with AGAA or with NGTD, expressed the respective heterodimeric receptors either transiently in epithelial HEK293T cells or stably in leukocytes (K562), and measured their ability to bind iC3b and to conformation-sensitive mAbs. In the presence of the physiologic divalent cations Ca(2+) plus Mg(2+) (at 1 mM each), the modified integrins showed increased (in HEK293) or constitutive (in K562) binding to iC3b compared with wild-type receptors. K562 expressing the betaTD-modified integrins bound in Ca(2+)Mg(2+) to the betaA-directed high-affinity reporter mAb 24 but not to mAb KIM127, a reporter of the genu-straightened state. These data identify a role for the membrane proximal betaTD as an allosteric modulator of integrin activation.

journal_name

Blood

journal_title

Blood

authors

Gupta V,Gylling A,Alonso JL,Sugimori T,Ianakiev P,Xiong JP,Arnaout MA

doi

10.1182/blood-2005-11-056689

subject

Has Abstract

pub_date

2007-04-15 00:00:00

pages

3513-20

issue

8

eissn

0006-4971

issn

1528-0020

pii

blood-2005-11-056689

journal_volume

109

pub_type

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