1887

Abstract

are Gram-positive soil bacteria that are used industrially, not only as a source of medically important natural compounds, but also as a host for the secretory production of a number of heterologous proteins. A good understanding of the different secretion processes in this organism is therefore of major importance. The functionality of the recently discovered bacterial twin-arginine translocation (Tat) pathway has already been shown in . Here, the aberrant phenotype of Δ and Δ single mutants is described. Both mutants are characterized by a dispersed growth in liquid medium, an impaired morphological differentiation on solid medium and growth retardation. To reveal the extent to which the Tat pathway is used in , putative Tat-dependent precursor proteins of , a very close relative of , and of , of which the genomes have been completely sequenced, were identified by a modified version of the computer program designed by Rose and colleagues [ Rose, R. W., Brüser, T., Kissinger, J. C. & Pohlschröder, M. (2002). , 943–950 ]. A list of 230 precursor proteins was obtained; this is the highest number of putative Tat substrates found in any genome so far. In addition to the tyrosinase, it was also demonstrated that the secretion of the xylanase C is Tat-dependent. The predicted Tat substrates belong to a variety of protein classes, with a high number of proteins functioning in degradation of macromolecules, in binding and transport, and in secondary metabolism. Only a minor fraction of the proteins seem to bind a cofactor. The aberrant phenotype of the Δ and Δ mutants together with the high number of putative Tat-dependent substrates suggests that the Tat pathway has a distinct and more important role in protein secretion than in most other bacteria.

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2004-01-01
2020-08-14
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