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The first identified member of this family was the salt-stress induced outer membrane protein SspA from Rhodobacter sphaeroides sp. denitrificans. It was found in the outer membrane acting as a transmembrane protein and was specifically induced by salt stress, but not by heat shock. Similar proteins were found later in many bacterial species from the genera Escherichia, Salmonella, Yersinia, Shewanella and Vibrio. Members of this family are predicted to possess a rather small barrel size compared to the general diffusion porins, while their biological role remains unknown.
Cloning and sequencing of a gene encoding a novel salt stress-induced membrane protein from Rhodobacter sphaeroides f. sp. dentrificans
Appl Microbiol Biotechnol. 2001 Aug;56(3-4):442-7. doi: 10.1007/s002530100665.
Salt-stress-responsive membrane proteins in Rhodobacter sphaeroides f. sp. denitrificans IL 106
J Biosci Bioeng. 2001;91(2):228-30. doi: 10.1263/jbb.91.228.
SspA, an outer membrane protein, is highly induced under salt-stressed conditions and is essential for growth under salt-stressed aerobic conditions in Rhodobacter sphaeroides f. sp. denitrificans
Appl Microbiol Biotechnol. 2005 Aug;68(2):242-50. doi: 10.1007/s00253-004-1852-7. Epub 2005 Jan 13.