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From a Natural Product to Its Biosynthetic Gene Cluster: A Demonstration Using Polyketomycin from Streptomyces diastatochromogenes Tü6028
Published on: January 13, 2017
Cryptosporidium parvum: the first protist known to encode a putative polyketide synthase
Guan Zhu1, Michael J LaGier, Frantisek Stejskal
1Department of Veterinary Pathobiology, College of Veterinary Medicine, Texas A&M University, 4467 TAMU, College Station, TX 77843-4467, USA. gzhu@cvm.tamu.edu
Researchers identified a large polyketide synthase (PKS) gene, CpPKS1, in Cryptosporidium parvum. This gene encodes a massive enzyme likely involved in producing molecules important for the parasite
Area of Science:
- Molecular Biology
- Biochemistry
- Parasitology
Background:
- Cryptosporidium parvum is an apicomplexan parasite causing opportunistic infections, particularly in AIDS patients.
- Polyketide synthases (PKS) are crucial enzymes in synthesizing diverse bioactive molecules, including antibiotics and anticancer agents.
Purpose of the Study:
- To identify and characterize a putative multifunctional Type I polyketide synthase (PKS) gene in Cryptosporidium parvum.
- To analyze the domain organization and phylogenetic relationship of the identified PKS gene (CpPKS1).
Main Methods:
- Sequence analysis of the CpPKS1 gene and its predicted protein product.
- Phylogenetic analysis of acyl transferase domains.
- Confirmation of CpPKS1 gene expression using reverse transcription-polymerase chain reaction (RT-PCR) and immunofluorescence microscopy.
Main Results:
- A large 40 kb intronless open reading frame (ORF) encoding CpPKS1, a 13,414 amino acid protein with 29 enzymatic domains, was identified.
- CpPKS1 exhibits a modular organization typical of Type I PKS, including a loading unit, seven elongation modules, and a reductase-homologous carboxy terminator.
- Phylogenetic analysis indicates that CpPKS1, like CpFAS1, incorporates acetate units, suggesting a role in synthesizing non-methylated fatty acids or polyketides.
Conclusions:
- The CpPKS1 gene is expressed in Cryptosporidium parvum.
- The unique carboxy-terminal reductase domain suggests a novel product release mechanism.
- CpPKS1 may play a significant role in the biology and pathogenicity of Cryptosporidium parvum, potentially producing medically relevant compounds.
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