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首頁 ? Pseudomonas alcaligenes?NCIMB 9867 strain產堿假單胞菌菌株 BioVector NTCC質粒載體菌種細胞基因保藏中心

Pseudomonas alcaligenes?NCIMB 9867 strain產堿假單胞菌菌株 BioVector NTCC質粒載體菌種細胞基因保藏中心

  • 價  格:¥98965
  • 貨  號:?Pseudomonas alcaligenes?NCIMB 9867
  • 產  地:北京
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Pseudomonas alcaligenes NCIMB 9867 strain產堿假單胞菌菌株

Pseudomonas alcaligenes NCIMB 9867 (strain P25X) is known to synthesize two isofunctional gentisate 1,2-dioxygenases (GDO; EC 1.13.11.4) as well as other enzymes involved in the degradation of xylenols and cresols via the gentisate pathway. The hbzE gene encoding what is possibly the strictly inducible gentisate 1,2-dioxygenase II (GDO-II) was cloned, overexpressed and purified as a hexahistidine fusion protein from Escherichia coli. Active recombinant GDO-II had an estimated molecular mass of 150kDa and is likely a tetrameric protein with a subunit mass of approximately 40kDa, similar to the previously characterized gentisate 1,2-dioxygenase I (GDO-I) encoded by xlnE. However, GDO-II was unable to utilize gentisate that is substituted at the carbon-4 position, unlike GDO-I which had broader substrate specificity. GDO-II also possessed different kinetic characteristics when compared to GDO-I. The hbzE-encoded GDO-II shared higher sequence identities (53%) with GDOs from Ralstonia sp. U2 and Polaromonas naphthalenivorans CJ2, compared with only 35% identity with the xlnE-encoded GDO-I. The hbzE gene was found to be part of a cluster of nine genes including the putative regulatory gene designated hbzR, which encodes an LysR-type regulator and is divergently transcribed from the other genes of the hbzHIJKLFED cluster.

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