Andrew R. Hesketh

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A strain of Streptomyces lividans, TK24, was found to produce a pigmented antibiotic, actinorhodin, although S. lividans normally does not produce this antibiotic. Genetic analyses revealed that a streptomycin-resistant mutation str-6 in strain TK24 is responsible for induction of antibiotic synthesis. DNA sequencing showed that str-6 is a point mutation in(More)
The newly sequenced genome of Streptomyces coelicolor is estimated to encode 7825 theoretical proteins. We have mapped approximately 10% of the theoretical proteome experimentally using two-dimensional gel electrophoresis and matrix-assisted laser desorption ionization time-of-flight (MALDI-TOF) mass spectrometry. Products from 770 different genes were(More)
Glutamine synthetase I (GSI) enzyme activity in Streptomyces coelicolor is controlled post-translationally by the adenylyltransferase (GlnE) as in enteric bacteria. Although other homologues of the Escherichia coli Ntr system (glnK, coding for a PII family protein; and glnD, coding for an uridylyltransferase) are found in the S. coelicolor genome, the(More)
Regulation of production of the translational apparatus via the stringent factor ppGpp in response to amino acid starvation is conserved in many bacteria. However, in addition to this core function, it is clear that ppGpp also exhibits genus-specific regulatory effects. In this study we used Affymetrix GeneChips to more fully characterize the regulatory(More)
The ssgA gene of Streptomyces griseus B2682, when present in high copy number, results in both suppression of sporulation and fragmented growth of mycelia. Western analysis with polyclonal antibodies against the gene product (SsgA) revealed a close correlation between SsgA accumulation and the onset of sporulation in wild-type cells. The protein was only(More)
Pichia pastoris is widely used as a host system for heterologous protein expression in both academia and industry. Production is typically accomplished by a fed-batch induction process that is known to have negative impacts on cell physiology that impose limits on both protein yields and quality. We have analysed recombinant protein production in chemostat(More)
An important attribute of proteome analysis carried out with the aid of two-dimensional gel electrophoresis is that post-translational modifications of proteins can often be revealed. Large-scale proteomic analysis of Streptomyces coelicolor A3(2) has been made possible with the availability of its genome sequence. Here, we bring together observations on(More)
Proteomics is rapidly evolving into a high-throughput technology, in which substantial and systematic studies are conducted on samples from a wide range of physiological, developmental, or pathological conditions. Reference maps from 2D gels are widely circulated. However, there is, as yet, no formally accepted standard representation to support the sharing(More)
Production of ppGpp in Streptomyces coelicolor A3(2) was achieved independently of amino acid limitation by placing N-terminal segments of the ppGpp synthetase gene, relA, under the control of a thiostrepton-inducible promoter (tipAp). S1 nuclease protection experiments indicated that induced ppGpp concentrations of 6-12 pmol mg(-1) dry weight in(More)