Process for enzymatic replacement of the B-30 amino acid in insulins
First Claim
1. A process for enzymatic replacement of the B-30 amino acid in insulins, characterized by reacting as substrate component the selected insulin Ins-X, wherein X represents the B-30 amino acid,with an amine component selected from the group consisting of(a) optionally N-substituted amino acid amides of the formula
wherein B is an amino acid residue and R1 and R2 are independently selected from the group consisting of hydrogen, amino, hydroxy, alkyl, cycloalkyl, aryl, heteroaryl and aralkyl or R1 and R2 together with the nitrogen atom form a heterocyclic group which may contain a further heterd atom, and(b) amino acid esters of the formula
space="preserve" listing-type="equation">H--B--OR.sup.3, H--B--SR.sup.3 or H--B SeR.sup.3wherein B is an amino acid residue and R3 represents alky, cycloalkyl, aryl, heteroaryl or aralkyl,in the presence of an L-specific serine or thiol carboxypeptidase enzyme in an aqueous solution or dispersion having a pH from about 7 to 10.5, thereby to form an insulin derivativeIns--B--NR1 R2, Ins--B--B--NR1 R2,Ins--B--OR3, Ins--B--SR3 or Ins--B--Ser3.
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Abstract
The B-30 amino acid in insulins is replaced enzymatically by
reacting as substrate component the selected insulin Ins-X, wherein X represents the B-30 amino acid
with an amine component selected from the group consisting of
(a) amino acids of the formula
H--B--OH
wherein B is an amino acid residue,
(b) optionally N-substituted amino acid amides of the formula
H--B--NR.sup.1 R.sup.2
wherein B is an amino acid residue and R1 and R2 are independently selected from the group consisting of hydrogen, amino, hydroxy, alkyl, cycloalkyl, aryl, heteroaryl and aralkyl or R1 and R2 together with the nitrogen atom form a heterocyclic group which may contain a further hetero atom, and
(c) amino acid esters of the formula
H--B--OR.sup.3, H--B--SR.sup.3 or H--B--SeR.sup.3
wherein B is am amino acid residue and R3 represents alkyl, cycloalkyl, aryl, heteroaryl or aralkyl
in the presence of an L-specific serine or thiol carboxypeptidase enzyme, preferably carboxypeptidase-Y, in an aqueous solution or dispersion having a pH from about 7 to 10.5, thereby to form an insulin derivative
Ins--B--OH, Ins--B--NR1 R2, Ins--B--B--NR1 R2,
Ins--B--OR3, Ins--B--SR3 or Ins--B--SeR3
and subsequently cleaving a group --NR1 R2, --B--NR1 R2, --OR3, --SR3 or SeR3, if desired, preferably by using a carboxypeptidase enzyme. The cleaving may also be performed on derivatives obtained by other methods.
By using porcine insulin as substrate component and threonine as the amino acid forming part of the amine component human insulin is obtained.
14 Citations
12 Claims
- 1. A process for enzymatic replacement of the B-30 amino acid in insulins, characterized by reacting as substrate component the selected insulin Ins-X, wherein X represents the B-30 amino acid,
with an amine component selected from the group consisting of (a) optionally N-substituted amino acid amides of the formula - space="preserve" listing-type="equation">H--B--NR.sup.1 R.sup.2
wherein B is an amino acid residue and R1 and R2 are independently selected from the group consisting of hydrogen, amino, hydroxy, alkyl, cycloalkyl, aryl, heteroaryl and aralkyl or R1 and R2 together with the nitrogen atom form a heterocyclic group which may contain a further heterd atom, and (b) amino acid esters of the formula
space="preserve" listing-type="equation">H--B--OR.sup.3, H--B--SR.sup.3 or H--B SeR.sup.3wherein B is an amino acid residue and R3 represents alky, cycloalkyl, aryl, heteroaryl or aralkyl, in the presence of an L-specific serine or thiol carboxypeptidase enzyme in an aqueous solution or dispersion having a pH from about 7 to 10.5, thereby to form an insulin derivative Ins--B--NR1 R2, Ins--B--B--NR1 R2, Ins--B--OR3, Ins--B--SR3 or Ins--B--Ser3. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
Specification