Abstract: The present invention provides a modified ethylenediamine-N,N?-disuccinate:ethylenediamine lyase. The present invention also provides a protein that comprises the amino acid sequence represented by SEQ ID NO: 1; or a protein that comprises an amino acid sequence derived from the amino acid sequence represented by SEQ ID NO: 1 by deletion, substitution, or addition of one or more amino acid residues, and has an ethylenediamine-N,N?-disuccinate:ethylenediamine lyase activity.

Abstract: Provided are a DNA fragment containing a gene relating the autonomous replication of a plasmid, and a DNA fragment containing a gene relating to the autonomous replication of a plasmid wherein a mutation point capable of increasing the number of copies of a plasmid is present in at least one site in the gene. Also provided are a DNA fragment containing a gene having a function relating to the autonomous replication of a plasmid within the bacteria of the genus Rhodococcus, a DNA fragment wherein a mutation point capable of increasing the number of copies of a plasmid is present in at least one site in the gene, and a plasmid carrying a DNA fragment wherein a mutation point capable of increasing the number of copies of a plasmid is present in at least one site of the gene.

Abstract: The present invention provides a modified ethylenediamine-N,N?-disuccinate:ethylenediamine lyase. The present invention also provides a protein that comprises the amino acid sequence represented by SEQ ID NO: 1; or a protein that comprises an amino acid sequence derived from the amino acid sequence represented by SEQ ID NO: 1 by deletion, substitution, or addition of one or more amino acid residues, and has an ethylenediamine-N,N?-disuccinate:ethylenediamine lyase activity.

Abstract: Provided are a DNA fragment containing a gene relating the autonomous replication of a plasmid, and a DNA fragment containing a gene relating to the autonomous replication of a plasmid wherein a mutation point capable of increasing the number of copies of a plasmid is present in at least one site in the gene. Also provided are a DNA fragment containing a gene having a function relating to the autonomous replication of a plasmid within the bacteria of the genus Rhodococcus, a DNA fragment wherein a mutation point capable of increasing the number of copies of a plasmid is present in at least one site in the gene, and a plasmid carrying a DNA fragment wherein a mutation point capable of increasing the number of copies of a plasmid is present in at least one site of the gene.

Abstract: The present specification relates to a DNA comprising a nucleotide sequence coding for a polypeptide having ethylenediamine-N,N′-disuccinic acid:ethylenediamine lyase activity, the polypeptide having the amino acid sequence of SEQ ID NO: 1 which may have a deletion, substitution or addition of at least one amino acid; a recombinant plasmid containing the DNA; a host transformed with the recombinant plasmid; and a method for producing a diaminoalkylene-N,N′-disuccinic acid using the transformed host. The present specification also relates to a polypeptide having ethylenediamine-N,N′-disuccinic acid:ethylenediamine lyase activity which has the amino acid sequence of SEQ ID NO: 1 that may have a deletion, substitution or addition of at least one amino acid.

Abstract: A process for producing an optically active aminopolycarboxylic acid, such as S,S-ethylenediamine-N,N'-disuccinic acid, from a mixture of a diamine, such as ethylenediamine, with fumaric acid using a microorganism having a lyase activity, wherein at least one metal ion selected from the group consisting of an alkaline earth metal, iron, zinc, copper, nickel, aluminum, titanium and manganese is added to the reaction system. According to this process, aminopolycarboxylic acids, such as S,S-ethylenediamine-N,N'-disuccinic acid, or metal complexes thereof, can be appropriately and efficiently produced while improving the reaction yield.

Abstract: The specification relates to circular plasmids derived from microorganisms of the genus Rhodococcus, which have sizes of about 3.6 kb and restriction site numbers of BamHI:1, BglII:1, ClaI:1, PstI:1, PvuII:2 and SacI:1. The circular plasmids of the present invention are useful as vectors in industrially useful host-vector systems.