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Compositions and methods for the preparation of protease resistant human growth hormone glycosylation mutants

a technology of protease and growth hormone, which is applied in the field of compositions and methods for the preparation of protease resistant human growth hormone glycosylation mutants, can solve the problems of limited use of therapeutic peptides, the immunogenic nature of most peptides, and the addition of peg molecules, and achieves the effect of pharmacokinetic properties

Inactive Publication Date: 2007-07-05
NOVO NORDISK AS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides mutant human growth hormones (hGH) with N-linked or O-linked glycosylation sites and / or proteolysis-resistant mutations that improve their pharmacokinetic properties relative to the wild-type hGH. These mutant hGHs can be produced by modifying the amino acid sequence of the wild-type hGH or by expressing a nucleic acid that encodes the mutant hGH. The mutant hGHs can also be chemically PEGylated or glycoPEGylated. The invention provides new hGH derivatives with improved pharmacokinetic properties that can be used for therapeutic purposes.

Problems solved by technology

A principal factor that has limited the use of therapeutic peptides is the immunogenic nature of most peptides.
Other deficiencies of therapeutic glycopeptides include suboptimal potency and rapid clearance rates.
The random addition of PEG molecules has its inherent disadvantages, including, e.g. the lack of homogeneity in the final product and potential for reduction in the biological or enzymatic activity of the peptide.
As previously mentioned, rapid in vivo degradation and clearance rate are other well-known problems that interfere with the optimal desired physiological effects of administered polypeptides.
The methods discussed above do not provide access to industrially relevant quantities of modified peptides that substantially retain the pharmacological activity of their unmodified analogues and possess protease resistance.

Method used

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  • Compositions and methods for the preparation of protease resistant human growth hormone glycosylation mutants
  • Compositions and methods for the preparation of protease resistant human growth hormone glycosylation mutants
  • Compositions and methods for the preparation of protease resistant human growth hormone glycosylation mutants

Examples

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example 1

[0464] Human growth hormone occurs in a variety of different isoforms and different amino acid sequences. The two best characterized forms include placental derived hGH, which is also known as GH-V (PDB P01242) and pituitary derived hGH, which is also known as somatotropin or GH-N(P01241); see FIG. 1. The pituitary derived hGH is not glycosylated and is produced in Escherichia coli as a therapeutic. The placental derived hGH (GH-V) has one N-glycosylation site at amino acid 140 (see Table 4 and FIG. 1, see arrow).

TABLE 4Human Growth Hormone (GH-V), Placenta Derived; P01242 (SEQ ID NO:2)fptiplsrlfdnamlrarrlyqlaydtyqefeeayilkeqkysflqnpqtslcfsesiptpsnrvktqqksnlellrisllliqswlepvqllrsvfanslvygasdsnvyrhlkdleegiqtlmwrledgsprtgqifnqsyskfdtkshnddallknygllycfrkdmdkvetflrivqcrsvegscgf            ↑

[0465] The pituitary derived hGH (GH-N) can be modified at amino acid position 140 to introduce an N-linked glycosylation site by mutating the nucleotide sequence encoding this polypeptide so that i...

example 2

[0467] An alternative approach is to create an O-linked glycosylation site into the pituitary derived hGH polypeptide. This O-linked glycosylation site may then be used as a site on which the mutated hGH polypeptide can be glycoPEGylated using a GalNAcT2 enzyme or the like. One or more additional transferases may then be used to add glycans or glycoconjugates to that site. Preferably, the mutated pituitary derived hGH polypeptide is glycoPEGylated. FIG. 4 describes the glycoPEGylation of an hGH O-linked glycan mutant produced in Escherichia coli.

example 3

[0468] As identified by the crystal structure of hGH and its receptor, the protein loop regions on pituitary derived hGH are best suited for mutation to introduce a glycosylation site (FIG. 5). Specifically, the nucleotide sequence that encodes amino acids 1-6 (FPTIPL; SEQ ID NO:10), amino acids 48-52 (PQTSL; SEQ ID NO:11), amino acids 59-64 (PTPSNR; SEQ ID NO:12), amino acids 133-139 (PRTGQIF; SEQ ID NO:13), amino acids 133-145 (PRTGQIFKQTYSK; SEQ ID NO:14), or amino acids 139-142 (FKQT; SEQ ID NO:15) of the wild-type pituitary derived hGH amino acid sequence (see Table 5 and FIG. 1) can be mutated so that either an N-linked or an O-linked glycosylation site is introduced into the resulting mutated pituitary-derived hGH polypeptide.

[0469]FIG. 6 illustrates six (6) of these introduced O-linked glycosylation sites. The arrows in FIG. 6 each represent the threonine residue on which O-linked glycosylation will occur in the GH-N O-linked glycan hGH mutant.

[0470]FIG. 7 and FIG. 8 each ...

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Abstract

The present invention relates to protease resistant mutants of human growth hormone, which contain newly introduced proteolysis resistant mutations and N-linked or O-linked glycosylation site(s), such that these recombinantly produced polypeptides have glycosylation patterns distinctly different from that of the naturally occurring human growth hormone. The polynucleotide coding sequences for the mutants, expression cassettes comprising the coding sequences, cells expressing the mutants, and methods for producing the mutants are also disclosed. Further disclosed are pharmaceutical compositions comprising the mutants and method for using the mutants.

Description

BACKGROUND OF THE INVENTION [0001] Human growth hormone (hGH) and agonist variants thereof are members of a family of recombinant proteins, described in U.S. Pat. No. 4,658,021 and U.S. Pat. No. 5,633,352. Their recombinant production and methods of use are detailed in U.S. Pat. Nos. 4,342,832, 4,601,980; U.S. Pat. No. 4,898,830; U.S. Pat. No. 5,424,199; and U.S. Pat. No. 5,795,745. Human growth hormone participates in various aspects of the regulation of normal human growth and development. Through interaction with its receptors, this 22 kDa pituitary hormone modulates a multitude of biological effects, such as linear growth (somatogenesis), lactation, activation of macrophages, and insulin-like and diabetogenic effects. Chawla, Annu. Rev. Med., 34: 519 (1983); Edwards et al., Science, 239: 769 (1988); Isaksson et al., Annu. Rev. Physiol., 47: 483 (1985); Thomer and Vance, J. Clin. Invest., 82: 745 (1988); Hughes and Friesen, Annu. Rev. Physiol., 47: 469 (1985). [0002] The administ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): A61K38/27C07H21/04C07K14/61
CPCC07K14/61A61K38/00A61P5/06A61K38/27C12N15/09
Inventor DEFREES, SHAWN
Owner NOVO NORDISK AS
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