Regulation and compartmentalization of β-lactam biosynthesis.
Penicillins and cephalosporins are β-lactam antibiotics widely used in human medicine. The biosynthesis of these compounds starts by the condensation of the amino acids L-α-aminoadipic acid, L-cysteine and L-valine to form the tripeptide δ-L-α-aminoadipyl-l-cysteinyl-D-valine catalysed by the non-ribosomal peptide 'ACV synthetase'. Subsequently, this tripeptide is cyclized to isopenicillin N that in Penicillium is converted to hydrophobic penicillins, e.g. benzylpenicillin. In Acremonium and in streptomycetes, isopenicillin N is later isomerized to penicillin N and finally converted to cephalosporin. Expression of genes of the penicillin (pcbAB, pcbC, pendDE) and cephalosporin clusters (pcbAB, pcbC, cefD1, cefD2, cefEF, cefG) is controlled by pleitropic regulators including LaeA, a methylase involved in heterochromatin rearrangement. The enzymes catalysing the last two steps of penicillin biosynthesis (phenylacetyl-CoA ligase and isopenicillin N acyltransferase) are located in microbodies, as shown by immunoelectron microscopy and microbodies proteome analyses. Similarly, the Acremonium two-component CefD1-CefD2 epimerization system is also located in microbodies. This compartmentalization implies intracellular transport of isopenicillin N (in the penicillin pathway) or isopenicillin N and penicillin N in the cephalosporin route. Two transporters of the MFS family cefT and cefM are involved in transport of intermediates and/or secretion of cephalosporins. However, there is no known transporter of benzylpenicillin despite its large production in industrial strains.
Institute of Biotechnology of León, Science Park, Avda. Real 1, 24006 León, Spain. jf.martin@unileon.es
Juan F
JF
Martín
Ricardo V
RV
Ullán
Carlos
C
García-Estrada
D000164:Acremonium / Q000378:metabolism*; D000900:Anti-Bacterial Agents / Q000096:biosynthesis*; D053898:Biosynthetic Pathways / Q000235:genetics; D015964:Gene Expression Regulation, Bacterial; D015966:Gene Expression Regulation, Fungal; D015388:Organelles / Q000378:metabolism; D010407:Penicillium / Q000378:metabolism*; D013302:Streptomyces / Q000378:metabolism*; D047090:beta-Lactams / Q000378:metabolism*
D000900:Anti-Bacterial Agents; D047090:beta-Lactams
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