On the contributing role of the transmembrane domain for subunit-specific sensitivity of integrin activation.

Abstract:

:Integrins are α/β heterodimeric transmembrane adhesion receptors. Evidence exists that their transmembrane domain (TMD) separates upon activation. Subunit-specific differences in activation sensitivity of integrins were reported. However, whether sequence variations in the TMD lead to differential TMD association has remained elusive. Here, we show by molecular dynamics simulations and association free energy calculations on TMDs of integrin αIIbβ3, αvβ3, and α5β1 that αIIbβ3 TMD is most stably associated; this difference is related to interaction differences across the TMDs. The order of TMD association stability is paralleled by the basal activity of these integrins, which suggests that TMD differences can have a decisive effect on integrin conformational free energies. We also identified a specific order of clasp disintegration upon TMD dissociation, which suggests that the closed state of integrins may comprise several microstates. Our results provide unprecedented insights into a possibly contributing role of TMD towards subunit-specific sensitivity of integrin activation.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Pagani G,Gohlke H

doi

10.1038/s41598-018-23778-5

subject

Has Abstract

pub_date

2018-04-10 00:00:00

pages

5733

issue

1

issn

2045-2322

pii

10.1038/s41598-018-23778-5

journal_volume

8

pub_type

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