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粗糙脉孢菌(1,3)β-葡聚糖合酶活性及细胞壁形成所需基因的克隆与特性分析

Cloning and characterization of a Neurospora crassa gene required for (1,3) beta-glucan synthase activity and cell wall formation.

作者信息

Enderlin C S, Selitrennikoff C P

机构信息

Department of Cellular and Structural Biology, University of Colorado Health Sciences Center, Denver 80262.

出版信息

Proc Natl Acad Sci U S A. 1994 Sep 27;91(20):9500-4. doi: 10.1073/pnas.91.20.9500.

Abstract

The glucan synthase 1 gene (gs-1) is required for (1,3) beta-glucan synthase activity [E.C. 2.4.1.34; UDP glucose:1,3-beta-D-glucan 3-beta-D-glucosyltransferase] and for cell wall formation. The gs-1 gene was cloned by functional complementation of the cell-wall-less defect of the (1,3) beta-glucan synthase-deficient mutant, TM1, by using a genomic Neurospora crassa cosmid library. A 2568-nucleotide gs-1 cDNA sequence revealed a 532-amino acid open reading frame encoding a polypeptide of 59 kDa. The predicted gs-1 gene product has no obvious signal peptide cleavage sites or transmembrane domains. A gs-1 null mutant is defective for cell wall formation and (1,3) beta-glucan synthase activity. The predicted GS-1 protein is weakly homologous to a putative Saccharomyces cerevisiae transcriptional regulatory protein.

摘要

葡聚糖合酶1基因(gs-1)对于(1,3)β-葡聚糖合酶活性[E.C. 2.4.1.34;UDP葡萄糖:1,3-β-D-葡聚糖3-β-D-葡糖基转移酶]以及细胞壁形成是必需的。通过使用粗糙脉孢菌基因组黏粒文库对(1,3)β-葡聚糖合酶缺陷型突变体TM1的无细胞壁缺陷进行功能互补,克隆了gs-1基因。一个2568个核苷酸的gs-1 cDNA序列揭示了一个532个氨基酸的开放阅读框,编码一个59 kDa的多肽。预测的gs-1基因产物没有明显的信号肽切割位点或跨膜结构域。一个gs-1基因缺失突变体在细胞壁形成和(1,3)β-葡聚糖合酶活性方面存在缺陷。预测的GS-1蛋白与一种推定的酿酒酵母转录调节蛋白有弱同源性。

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