PRIMARY STRUCTURE OF THE NUCLEAR-ENCODED 29.9 KDA SUBUNIT OF NADH - UBIQUINONE REDUCTASE FROM NEUROSPORA-CRASSA MITOCHONDRIA

We isolated and sequenced cDNA for the 29.9 kDa subunit of mitochondrial NADH:ubiquinone reductase (complex I) from a Neurospora crassa library in the lambda-gt11 expression vector. The N-terminus of the mature protein was determined by Edman-degradation. The cDNA contains an open reading frame encoding a preprotein of 273 amino acids. The presequence of the transit protein essential for mitochondrial import is eight residues long. Northern-blot analysis shows, that the level of the corresponding mRNA is increased 3-fold if cells are grown in the presence of chloramphenicol.