Domain topology of human Rasal.

Abstract:

:Rasal is a modular multi-domain protein of the GTPase-activating protein 1 (GAP1) family; its four known members, GAP1m, Rasal, GAP1IP4BP and Capri, have a Ras GTPase-activating domain (RasGAP). This domain supports the intrinsically slow GTPase activity of Ras by actively participating in the catalytic reaction. In the case of Rasal, GAP1IP4BP and Capri, their remaining domains are responsible for converting the RasGAP domains into dual Ras- and Rap-GAPs, via an incompletely understood mechanism. Although Rap proteins are small GTPase homologues of Ras, their catalytic residues are distinct, which reinforces the importance of determining the structure of full-length GAP1 family proteins. To date, these proteins have not been crystallized, and their size is not adequate for nuclear magnetic resonance (NMR) or for high-resolution cryo-electron microscopy (cryoEM). Here we present the low resolution structure of full-length Rasal, obtained by negative staining electron microscopy, which allows us to propose a model of its domain topology. These results help to understand the role of the different domains in controlling the dual GAP activity of GAP1 family proteins.

journal_name

Biol Chem

journal_title

Biological chemistry

authors

Cuellar J,Valpuesta JM,Wittinghofer A,Sot B

doi

10.1515/hsz-2017-0159

subject

Has Abstract

pub_date

2017-12-20 00:00:00

pages

63-72

issue

1

eissn

1431-6730

issn

1437-4315

pii

/j/bchm.just-accepted/hsz-2017-0159/hsz-2017-0159.

journal_volume

399

pub_type

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