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Hydrophobins DGH1, DGH2, and DGH3 in the Lichen-Forming Basidiomycete Dictyonema glabratum
- Source :
-
Fungal Genetics & Biology . Apr2002, Vol. 35 Issue 3, p247. 13p. - Publication Year :
- 2002
-
Abstract
- Dictyonema glabratum is a lichen-forming basidiomycete whose symbiotic phenotype shares similarities to both lichens and its non-lichen-forming relatives. In the photobiont layer of D. glabratum intercellular gas-filled spaces are present even when the lichen is water-saturated. The walls of hyphae lining air cavities are covered by a hydrophobic, rodlet-patterned layer, assumed to be formed by hydrophobins. Hot SDS-insoluble, but trifluoroacetic acid-soluble lichen cell wall extracts contained seven proteins. The N-terminal sequence of the most abundant 14-kDa protein was used to carry out cDNA cloning by RT-PCR. The deduced amino acid sequence of the amplified fragment encoded a class I hydrophobin, called DGH1. The cDNA sequence encoding the signal peptide was cloned by RACE-PCR, which also coamplified cDNA fragments encoding two additional class I hydrophobins, DGH2 and DGH3. The three proteins share 54 to 66% amino acid identity. The D. glabratum hydrophobin extract containing either all proteins or primarily DGH1 self-assembled and formed a rodlet mosaic similar to the one observed in situ. Concentration of the protein extract was shown to influence the length of the self-assembled rodlets. [Copyright &y& Elsevier]
- Subjects :
- *BASIDIOMYCETES
*LICHENS
Subjects
Details
- Language :
- English
- ISSN :
- 10871845
- Volume :
- 35
- Issue :
- 3
- Database :
- Academic Search Index
- Journal :
- Fungal Genetics & Biology
- Publication Type :
- Academic Journal
- Accession number :
- 8503354
- Full Text :
- https://doi.org/10.1006/fgbi.2001.1325