Expression of processed recombinant lactoferrin and lactoferrin polypeptide fragments from a fusion product in aspergillus
First Claim
1. A recombinant expression plasmid vector comprising the following components operably linked 5'"'"' to 3'"'"':
- (a) a promoter;
(b) a nucleotide sequence encoding a signal peptide;
(c) a nucleotide sequence encoding an amino-terminal portion of an endogenous secreted Aspergillus polypeptide;
(d) a nucleotide sequence encoding a peptide linker, said peptide linker comprising a fungal peptidase cleavage site; and
(e) a nucleotide sequence encoding a lactoferrin or lactoferrin polypeptide fragment;
wherein said vector permits the expression of a lactoferrin or a lactoferrin polypeptide fragment as a fusion protein and the subsequent production of same as a processed protein.
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Abstract
The subject invention provides for the production of lactoferrins and lactoferrin polypeptide fragments using the host cells Aspergillus in combination with novel plasmid constructs. More specifically, the subject invention provides novel vector constructs capable of producing lactoferrins and lactoferrin polypeptide fragments in Aspergillus host cells. More particularly, the subject invention provides for novel plasmid constructs suitable for use with Aspergillus and especially Aspergillus awamori, niger and oryzae host cells, which enables them to produce large amounts of recombinant lactoferrins and lactoferrin polypeptide fragments.
52 Citations
55 Claims
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1. A recombinant expression plasmid vector comprising the following components operably linked 5'"'"' to 3'"'"':
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(a) a promoter; (b) a nucleotide sequence encoding a signal peptide; (c) a nucleotide sequence encoding an amino-terminal portion of an endogenous secreted Aspergillus polypeptide; (d) a nucleotide sequence encoding a peptide linker, said peptide linker comprising a fungal peptidase cleavage site; and (e) a nucleotide sequence encoding a lactoferrin or lactoferrin polypeptide fragment; wherein said vector permits the expression of a lactoferrin or a lactoferrin polypeptide fragment as a fusion protein and the subsequent production of same as a processed protein. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 50)
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21. A recombinant expression plasmid vector comprising the following components operably linked from 5'"'"' to 3'"'"':
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(a) a promoter from the A. awamori glucoamylase gene; (b) a a nucleotide sequence encoding a signal peptide from the A. awamori glucoamylase gene; (c) a nucleotide sequence encoding an amino-terminal portion of the A. awamori glucoamylase gene; (d) a nucleotide sequence encoding a Kex2 peptidase cleavage site whereby there is an endogenous proteolytic enzyme specific for said nucleotide sequence; (e) a nucleotide sequence encoding lactoferrin or a lactoferrin polypeptide fragment; (f) a transcription termination sequence from the A. niger glucoamylase gene; and (g) a phleomycin resistance selectable marker gene;
wherein said vector permits the expression of a lactoferrin or a lactoferrin polypeptide fragment as a fusion protein and the subsequent production of the same as a processed protein.
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22. A recombinant expression plasmid vector comprising the following components operably linked from 5'"'"' to 3'"'"':
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(a) a promoter from the A. niger glucoamylase gene; (b) a nucleotide sequence encoding a signal peptide from the A. niger glucoamylase gene; (c) a nucleotide sequence encoding an amino-terminal portion of the A. niger glucoamylase gene; (d) a nucleotide sequence encoding Kex2 peptidase cleavage site whereby there is an endogenous proteolytic enzyme specific for said nucleotide sequence; (e) a nucleotide sequence encoding a lactoferrin or a lactoferrin polypeptide fragment; (f) a transcription termination sequence from the A. niger glucoamylase gene; and (g) a phleomycin resistance selectable marker gene; wherein said vector permits the expression of a lactoferrin or a lactoferrin polypeptide fragment as a fusion protein and the subsequent production of the same as a processed protein after transformation of said vector into A. niger cells. - View Dependent Claims (51)
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23. A recombinant expression plasmid vector comprising the following components operably linked from 5'"'"' to 3'"'"':
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(a) a promoter from the A. oryzae α
-amylase gene;(b) a nucleotide sequence encoding a signal peptide from the A. oryzae α
-amylase gene;(c) a nucleotide sequence encoding an amino-terminal portion of the A. oryzae α
-amylase gene;
(d) a nucleotide sequence encoding Kex2 peptidase cleavage site whereby there is an endogenous proteolytic enzyme specific for said nucleotide sequence;(e) a nucleotide sequence encoding a lactoferrin or a lactoferrin polypeptide fragment; (f) a transcription termination sequence from the A. niger glucoamylase gene; and (g) α
-phleomycin resistance selectable marker gene;wherein said vector permits the expression of a lactoferrin or a lactoferrin polypeptide fragment as a fusion protein and the subsequent production of the same as a processed protein. - View Dependent Claims (52)
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24. An expression plasmid vector comprising the following components operably linked from 5'"'"' to 3'"'"':
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(a) a promoter from the A. awamori glucoamylase gene; (b) a nucleotide sequence encoding a signal peptide from the A. awamori glucoarnylase gene; (c) a nucleotide sequence encoding an amino-terminal portion of the A. awamori glucoamylase gene; (d) a nucleotide sequence encoding Kex2 peptidase cleavage site whereby there is an endogenous proteolytic enzyme specific for said nucleotide sequence; (e) a nucleotide sequence encoding a human lactoferrin or a human lactoferrin polypeptide fragment; (f) a transcription termination sequence from the A. niger glucoamylase gene; and (g) a phleomycin resistance selectable marker gene; wherein said plasmid is used for expressing human lactoferrin or a human lactoferrin polypeptide fragment in Aspergillus fungal cells. - View Dependent Claims (25, 26)
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27. A process for producing lactoferrin which comprises culturing a transformed Aspergillus fungal cell comprising a recombinant plasmid, wherein said plasmid comprises the following components operably linked from 5'"'"' to 3'"'"':
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(a) a promoter; (b) a nucleotide sequence encoding a signal peptide;
(c) a nucleotide sequence encoding an amino-terminal portion of an endogenous secreted Aspergillus polypeptide;(d) a nucleotide sequence encoding a peptide linker, said peptide linker comprising a fungal peptidase cleavage site; and (e) a nucleotide sequence encoding a lactoferrin or a lactoferrin polypeptide fragment; wherein said transformed Aspergillus fungal cells are cultured in a suitable nutrient medium until lactoferrin protein or lactoferrin polypeptide fragment is produced as a fusion product and then processed via an endogenous proteolytic enzyme specific for said linker sequence, wherein said processed lactoferrin or lactoferrin polypeptide fragment is secreted into the nutrient medium and isolated therefrom. - View Dependent Claims (28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 53, 54)
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46. A process for producing lactoferrin which comprises culturing a transformed Aspergillus awamori fungal cell comprising a recombinant plasmid, wherein said plasmid comprises the following components operably linked from 5'"'"' to 3'"'"':
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(a) a promoter from the A. awamori glucoamylase gene; (b) a nucleotide sequence encoding a signal peptide from the A. awamori glucoamylase gene; (c) a nucleotide sequence encoding an amnino-terminal portion of the A. awamori glucoamylase gene; (d) a nucleotide sequence encoding Kex2 peptidase cleavage site whereby there is an endogenous proteolytic enzyme specific for said nucleotide sequence; (e) a nucleotide sequence encoding a human lactoferrin or a human lactoferrin polypeptide fragment; (f) a transcription termination sequence from the A. niger glucoamylase gene; and (g) a phleomycin resistance selectable marker gene;
wherein said transformed Aspergillus awamori fungal cell is cultured in a suitable nutrient medium until lactoferrin or lactoferrin polypeptide fragment is produced as a fusion product and then processed via an endogenous proteolytic enzyme specific for said linker sequence, wherein said processed lactoferrin or lactoferrin polypeptide fragment is secreted into the nutrient medium and isolated therefrom.
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47. A process for producing lactoferrin which comprises culturing a transformed Aspergillus oryzae fungal cell comprising a recombinant plasmid, wherein said plasmid comprises the following components operably linked from 5'"'"' to 3'"'"':
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(a) a promoter from the A. oryzae α
-amylase gene;(b) a nucleotide sequence encoding a signal peptide from the A. oryzae α
-amylase gene;(c) a nucleotide sequence encoding an amino-terminal portion of the A. oryzae α
-amylase gene;(d) a nucleotide sequence encoding Kex2 peptidase cleavage site whereby there is an endogenous proteolytic enzyme specific for said nucleotide sequencer; (e) a nucleotide sequence encoding a lactoferrin or a lactoferrin polypeptide fragment; (f) a transcription termination sequence from the A. niger glucoamylase gene; and (g) α
-phleomycin resistance selectable marker gene;wherein said transformed Aspergillus oryzae fungal cell is cultured in a suitable nutrient medium until lactoferrin or a lactoferrin polypeptide fragment is produced as a fusion product and then processed via an endogenous proteolytic enzyme specific for said nucleotide sequence, wherein said processed lactoferrin or lactoferrin polypeptide fragment is secreted into the nutrient medium and isolated therefrom.
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48. A process for producing lactoferrin which comprises culturing a transformed Aspergillus niger fungal cell comprising a recombinant plasmid, wherein said plasmid comprises the following components operably linked from 5'"'"' to 3'"'"':
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(a) a promoter from the A. niger glucoamylase gene; (b) a nucleotide sequence encoding a signal peppide from the A. niger glucoamylase gene; (c) a nucleotide sequence encoding an amino-terminal portion of the A. awamori glucoamylase gene; (d) a nucleotide sequence encoding Kex2 peptidase cleavage site whereby there is an endogenous proteolytic enzyme specific for said nucleotide sequence; (e) a nucleotide sequence encoding lactoferrin or lactoferrin polypeptide fragment; (f) a transcription termination sequence from the A. niger glucoamnylase gene; and (g) a phleomycin resistance selectable marker gene; wherein said transformed Aspergillus niger fungal cell is cultured in a suitable nutrient medium until lactoferrin or lactoferrin polypeptide fragment is produced as a fusion product and then processed via an endogenous proteolytic enzyme specific for said linker sequence, wherein said processed lactoferrin or lactoferrin polypeptide fragment is secreted into the nutrient medium and isolated therefrom.
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49. A method of isolating lactoferrin polypeptide fragment from fungal nutrient medium comprising culturing a transformed Aspergillus awamori fungal cell comprising a recombinant plasmid vector, wherein said plasmid vector comprises a promoter from A. awamori glucoamylase gene, a signal sequence from the A. awamori glucoamylase gene, a 5'"'"' portion of the A. awamori glucoamylase gene, a linker sequence encoding Kex2 peptidase cleavage site whereby there is an endogenous proteolytic enzyme is specific for said linker sequence, a nucleotide sequence encoding a lactoferrin or lactoferrin polypeptide fragment, a transcription termination sequence from the A. niger glucoamylase gene, and a phleomycin resistance selectable marker gene and wherein said transformed Aspergillus awamori fungal cells are cultured in a suitable nutrient medium until lactoferrin or lactoferrin polypeptide fragment is produced as a fusion product and then processed via an endogenous proteolytic enzyme specific for said linker sequence, wherein said processed lactoferrin or lactoferrin polypeptide fragment is secreted into the nutrient medium and isolated therefrom.
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55. A lactoferrin protein or a lactoferrin polypeptide fragment as produced by a process for producing lactoferrin which comprises culturing a transformed Aspergillus awamori fungal cell comprising a recombinant plasmid, wherein said plasmid comprises the following components operably linked from 5'"'"' to 3'"'"':
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(a) a promoter from the A. awamori glucoamylase gene; (b) a nucleotide sequence encoding a signal peptide from the A. awamori glucoamylase gene; (c) a nucleotide sequence encoding an amino-terminal portion of the A. awamori glucoamylase gene; (d) a nucleotide sequence encoding Kex2 peptidase cleavage site whereby there is an endogenous proteolytic enzyme specific for said nucleotide sequence; (e) a nucleotide sequence encoding lactoferrin or lactoferrin polypeptide fragment; (f) a transcription termination sequence from the A. niger glucoamylase gene; and (g) a phleomycin resistance selectable marker gene; wherein said transformed Aspergillus awamori fungal cell is cultured in a suitable nutrient medium until lactoferrin or lactoferrin polypeptide fragment is produced as a fusion product and then processed via an endogenous proteolytic enzyme specific for said linker sequence, wherein said processed lactoferrin or lactoferrin polypeptide fragment is secreted into the nutrient medium and isolated therefrom.
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Specification