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Proteomic and Transcriptomic Analysis of Extracellular Proteins and mRNA Levels in Thermobifida fusca Grown on Cellobiose and Glucose

Shaolin Chen and David B. Wilson^*

Department of Molecular Biology and Genetics, 458 Biotechnology Building, Cornell University, Ithaca, New York 14853

Received 16 April 2007/ Accepted 19 June 2007

Thermobifida fusca secretes proteins that carry out plant cell wall degradation. Using two-dimensional electrophoresis, the extracellular proteome of T. fusca grown on cellobiose was compared to that of cells grown on glucose. Extracellular proteins, the expression of which is induced by cellobiose, mainly are cellulases and cellulose-binding proteins. Other major extracellular proteins induced by cellobiose include a xylanase (Xyl10A) and two unknown proteins, the C-terminal regions of which are homologous to a lytic transglycosylase goose egg white lysozyme domain and an NLPC_P60 domain (which defines a family of cell wall peptidases), respectively. Transcriptional analysis of genes encoding cellobiose-induced proteins suggests that their expression is controlled at the transcriptional level and that their expression also is induced by cellulose. Some other major extracellular proteins produced by T. fusca grown on both cellobiose and glucose include Lam81A and three unknown proteins that are homologous to aminopeptidases and xylanases or that contain a putative NLPC_P60 domain.

Published ahead of print on 29 June 2007.

Present address: Department of Plant Biology, Carnegie Institution of Washington, Stanford, CA 94305.