View metadata, citation and similar papers at core.ac.uk brought to you by CORE provided by Institute of Cancer Research Repository Biochemical Society Transactions (2016) 0 1–8 DOI: 10.1042/BST20160219 1 2 The Borg family of Cdc42 effector proteins 3 4 Cdc42EP1–5 5 6 Aaron J. Farrugia and Fernando Calvo 7 8 Tumour Microenvironment Team, Division of Cancer Biology, Institute of Cancer Research, 237 Fulham Road, London SW2 6JB, U.K. 9 Correspondence: Fernando Calvo (
[email protected]) 10 11 12 13 Despite being discovered more than 15 years ago, the Borg (binder of Rho GTPases) 14 – family of Cdc42 effector proteins (Cdc42EP1 5) remains largely uncharacterised and rela- 15 tively little is known about their structure, regulation and role in development and disease. 16 Recent studies are starting to unravel some of the key functional and mechanistic 17 aspects of the Borg proteins, including their role in cytoskeletal remodelling and signal- 18 ling. In addition, the participation of Borg proteins in important cellular processes such as 19 cell shape, directed migration and differentiation is slowly emerging, directly linking Borgs 20 with important physiological and pathological processes such as angiogenesis, neuro- 21 fi transmission and cancer-associated desmoplasia. Here, we review some of these nd- 22 ings and discuss future prospects. 23 24 25 26 27 28 29 Introduction 30 The Rho GTPase family member Cdc42 regulates a diverse range of cellular functions including cyto- 31 kinesis, cytoskeletal remodelling and cell polarity [1,2]. Like other Rho family members, Cdc42 cycles 32 between two tightly regulated conformational states, a GTP-bound active state and a GDP-bound 33 inactive state [3].