Open AccessDomains involved in the in vivo function and oligomerization of apical growth determinant DivIVA in Streptomyces coelicolor
Author(s) -
Wang ShengBing,
Cantlay Stuart,
Nordberg Niklas,
Letek Michal,
Gil José A.,
Flärdh Klas
Publication year - 2009
Publication title -
fems microbiology letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.899
H-Index - 151
eISSN - 1574-6968
pISSN - 0378-1097
DOI - 10.1111/j.1574-6968.2009.01678.x
Subject(s) - streptomyces coelicolor , biology , coiled coil , microbiology and biotechnology , peptide sequence , streptomyces , biochemistry , genetics , bacteria , gene
The coiled‐coil protein DivIVA is a determinant of apical growth and hyphal branching in Streptomyces coelicolor . We have investigated the properties of this protein and the involvement of different domains in its essential function and subcellular targeting. In S. coelicolor cell extracts, DivIVA was present as large oligomeric complexes that were not strongly membrane associated. The purified protein could self‐assemble into extensive protein filaments in vitro . Two large and conspicuous segments in the amino acid sequence of streptomycete DivIVAs not present in other homologs, an internal PQG‐rich segment and a carboxy‐terminal extension, are shown to be dispensable for the essential function in S. coelicolor . Instead, the highly conserved amino‐terminal of 22 amino acids was required and affected establishment of new DivIVA foci and hyphal branches, and an essential coiled‐coil domain affected oligomerization of the protein.