pMH2, a small plasmid bearing the nif gene cluster of Enterobacter agglomerans 333 as an excisable cassette |
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Authors: | Frank Stumpf Lidija Halda and Walter Klingmüller |
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Institution: | (1) Lehrstuhl für Genetik, Universität Bayreuth, P.O. Box 101251, D-95440 Bayreuth, Germany;(2) Present address: Maize Research Institute, YU-11080 ZemunBeograd, Yugoslavia |
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Abstract: | 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 nifA,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. |
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Keywords: | Enterobacter agglomerans nif gene cluster nif cassette |
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