This family consists of several archaeal GvpD gas vesicle regulatory proteins. GvpD is involved in the regulation of gas vesicle formation and functions as a repressor through the interaction and the breakdown induction of the transcriptional activator GvpE [1,2,3, 4,5]. This domain includes the P-loop and the basic region 1 (bR1, an arginine-rich region) which are essential for GvpD repressive function [3,4].

1: Transcript analysis of the c-vac region and differential synthesis of the two regulatory gas vesicle proteins GvpD and GvpE in Halobacterium salinarium PHH4. Kruger K, Pfeifer F; J Bacteriol 1996;178:4012-4019. PMID:8763925

2: Regulation of the expression of gas vesicle genes in Haloferax mediterranei: interaction of the two regulatory proteins GvpD and GvpE. Zimmermann P, Pfeifer F; Mol Microbiol 2003;49:783-794. PMID:12864859

3: GvpD-induced breakdown of the transcriptional activator GvpE of halophilic archaea requires a functional p-loop and an arginine-rich region of GvpD. Scheuch S, Pfeifer F; Microbiology (Reading). 2007;153:947-958. PMID:17379705

4: A p-loop motif and two basic regions in the regulatory protein GvpD are important for the repression of gas vesicle formation in the archaeon Haloferax mediterranei. Pfeifer F, Zotzel J, Kurenbach B, Roder R, Zimmermann P; Microbiology (Reading). 2001;147:63-73. PMID:11160801

5: Haloarchaea and the formation of gas vesicles. Pfeifer F; Life (Basel). 2015;5:385-402. PMID:25648404

6: Improved GFP Variants to Study Gene Expression in Haloarchaea. Born J, Pfeifer F; Front Microbiol. 2019;10:1200. PMID:31191505