Reference: Chen J, et al. (2000) Molecular Cloning of MAPK Gene Family Using Degenerate PCR. Sheng Wu Hua Xue Yu Sheng Wu Wu Li Xue Bao (Shanghai) 32(3):305-311

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Abstract


MAPK(Mitogen-activated protein kinase) pathways play an important role in morphorgenesis of Candida albicans. According to the conserved amino acid sequence of the known MAPKs, two degenerate primers attaching to subdomain VIB and IX were designed to screen novel MAPKs in C. albicans. The PCR was performed under non-strigent conditons. 100 PCR fragments were sequenced and among 25 novel gene fragments, two novel MAPK gene fragments were obtained. Using these two PCR fragments as probes to screen a Candida albicans genomic DNA library, two novel MAPK genes designated CSK1(Candida albicans sporulation-related MAP kinase1) and CEK2(Candida albicans extracellular signal-regulated kinase 2) were cloned. These two genes share high similarity with three cloned MAPK genes CEK1 and MKC1 and CaHOG1. The CSK1 gene is 1 193 bp in length, containing a 92 bp intron, coding for a 367 aa protein. The CSK1 shares highest similarity with SMK1, with homology 55.3% in nucleotide sequence and 50% in amino acid sequence. SMK1 encodes a MAPK involved in the sporulation pathway in S. cerevisiae. In vitro kinase activity assay showed that the Csk1 kinase exhibited a phosphorylation ability when using MBP as a substrate but not histone H1.

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Journal Article
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Chen J, Ni J, Chen JY
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