pMH2, a small plasmid bearing the nif gene cluster of Enterobacter agglomerans 333 as an excisable cassette
✍ Scribed by Stumpf, Frank ;Halda, Lidija ;Klingmüller, Walter
- Book ID
- 104701652
- Publisher
- Springer
- Year
- 1993
- Tongue
- English
- Weight
- 406 KB
- Volume
- 241-241
- Category
- Article
- ISSN
- 0026-8925
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✦ Synopsis
A small plasmid containing the entire nif gene cluster of Enterobacter agglomerans 333 as an excisable cassette has been constructed, using pACYC177 as a vector. Two cosmid clones taken from a gene library of E. agglomerans plasmid pEA3 were used as a source of nif genes. A SmaI fragment of peaMS2-2, containing the H,D,K,Y,E,N,X,U,S,V,W,Z,M,L,A and B genes and an ApaI fragment of peaMS2-16 containing nif A,B,Q,F and J were selected to construct pMH2. The resulting plasmid of 33 kb carries the complete nif gene cluster as a nif cassette on a single XbaI fragment. The nif construct pMH2 in Escherichia coli strains has significant nitrogenase activity compared to wild-type E. agglomerans 333. The nif gene cluster construct was found to be very stable.