title: Domains involved in the in vivo function and oligomerization of apical growth determinant DivIVA in Streptomyces coelicolor.
abstract: 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.
authors: Department of Cell and Organism Biology, Lund University, Lund, Sweden.
authors: Sheng-Bing
authors: SB
authors: Wang
authors: Stuart
authors: S
authors: Cantlay
authors: Niklas
authors: N
authors: Nordberg
authors: Michal
authors: M
authors: Letek
authors: José A
authors: JA
authors: Gil
authors: Klas
authors: K
authors: Flärdh
mesh_terms: D020816:Amino Acid Motifs; D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D018797:Cell Cycle Proteins / Q000737:chemistry* / Q000235:genetics / Q000378:metabolism*; D055503:Protein Multimerization; D017434:Protein Structure, Tertiary; D048372:Streptomyces coelicolor / Q000737:chemistry / Q000235:genetics / Q000254:growth & development / Q000378:metabolism*
chemical_list: D001426:Bacterial Proteins; D018797:Cell Cycle Proteins; C104636:DivIVA protein, bacteria