Please use this identifier to cite or link to this item: https://doi.org/10.1242/jcs.021774
Title: BNIP2 extra long inhibits RhoA and cellular transformation by Lbc RhoGEF via its BCH domain
Authors: Soh, U.J.K. 
Low, B.C. 
Keywords: BCH domain
BNIP-2
Cellular transformation
Lbc
Rho
RhoGEF
Issue Date: 15-May-2008
Citation: Soh, U.J.K., Low, B.C. (2008-05-15). BNIP2 extra long inhibits RhoA and cellular transformation by Lbc RhoGEF via its BCH domain. Journal of Cell Science 121 (10) : 1739-1749. ScholarBank@NUS Repository. https://doi.org/10.1242/jcs.021774
Abstract: Increased expression of BCH-motif-containing molecule at the C-terminal region 1 (BMCC1) correlates with a favourable prognosis in neuroblastoma, but the underlying mechanism remains unknown. We here isolated BNIPXL (BNIP2 Extra Long) as a single contig of the extended, in-vitro-assembled BMCC1. Here, we show that in addition to homophilic interactions, the BNIP2 and Cdc42GAP homology (BCH) domain of BNIPXL interacts with specific conformers of RhoA and also mediates association with the catalytic DH-PH domains of Lbc, a RhoA-specific guanine nucleotide exchange factor (RhoGEF). BNIPXL does not recognize the constitutive active G14V and Q63L mutants of RhoA but targets the fast-cycling F30L and the dominant-negative T19N mutants. A second region at the N-terminus of BNIPXL also targets the proline-rich region of Lbc. Whereas overexpression of BNIPXL reduces active RhoA levels, knockdown of BNIPXL expression has the reverse effect. Consequently, BNIPXL inhibits Lbc-induced oncogenic transformation. Interestingly, BNIPXL can also interact with RhoC, but not with RhoB. Given the importance of RhoA and RhoGEF signaling in tumorigenesis, BNIPXL could suppress cellular transformation by preventing sustained Rho activation in concert with restricting RhoA and Lbc binding via its BCH domain. This could provide a general mechanism for regulating RhoGEFs and their target GTPases.
Source Title: Journal of Cell Science
URI: http://scholarbank.nus.edu.sg/handle/10635/100183
ISSN: 00219533
DOI: 10.1242/jcs.021774
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