Modified interferon-gamma polypeptides and methods for using modified interferon-gamma polypeptides

• US 20060251619A1
• Filed: 05/04/2006
• Published: 11/09/2006
• Est. Priority Date: 05/04/2005
• Status: Abandoned Application

• Current Assignee: Hanall Pharmaceutical Company Limited
• Original Assignee: Hanall Pharmaceutical Company Limited
• Inventors: Guyon, Thierry, Drittanti, Lila, Borrelly, Gilles
• Application Number:
  US11/429,100
• Publication Number:
  US 20060251619A1
• Time in Patent Office: Days
• US Class Current: 424/85.600
• CPC Class Codes: A61K 38/00 Medicinal preparations containing peptides peptides containing beta-lactam rings A61K31/00; cyclic dipeptides not having in their molecule any other peptide link than those which form their ring, e.g. piperazine-2,5-diones, A61K31/00; ergot alkaloids of the cyclic peptide type A61K31/48; containing macromolecular compounds having statistically distributed amino acid units A61K31/74; medicinal preparations containing antigens or antibodies A61K39/00; medicinal preparations characterised by the non-active ingredients, e.g. peptides as drug carriers, A61K47/00
• CPC Class Codes: A61P 11/00 Drugs for disorders of the respiratory system
• CPC Class Codes: A61P 31/04 Antibacterial agents
• CPC Class Codes: A61P 31/12 Antivirals
• CPC Class Codes: A61P 33/02 Antiprotozoals, e.g. for leishmaniasis, trichomoniasis, toxoplasmosis
• CPC Class Codes: A61P 35/00 Antineoplastic agents
• CPC Class Codes: C07K 14/57 IFN-gamma
• CPC Class Codes: Y02A 50/30 Against vector-borne diseases, e.g. mosquito-borne, fly-borne, tick-borne or waterborne diseases whose impact is exacerbated by climate change

Abstract

Provided are modified interferon-gamma (IFN-γ) polypeptides and methods of generating modified interferon-gamma polypeptides. Also provided are methods of treatment using modified interferon-gamma polypeptides.

Claims

1. A modified interferon-γ

polypeptide, comprising one or more amino acid replacements in an unmodified IFN-γ

polypeptide at positions corresponding to any of amino acid positions 2, 5-12, 14-18, 24, 27-29, 31, 32, 35, 36, 39, 44, 45, 48, 51, 53-55, 57, 59, 60, 62, 63, 71-80, 83, 84, 89-99, 100, 101, 105, 106, 109, 115, 117, 122, 123, 125, 128, 131-134, 137-139, 142, 143 of a mature interferon-γ

, wherein;

the mature human interferon-γ

comprises the sequence of amino acids set forth in SEQ ID NO;

1;

the modified interferon-γ

polypeptide exhibits increased protein stability compared to the unmodified human interferon-γ

; and

if position 5 is replaced, the replacing amino acid is not cysteine;

if position 6, 12, 17, 24, 62, 71, 74, 75, 77, 78, 89, 93, 96, 105, or 106 is replaced, the replacing amino acid is not cysteine;

if position 9 or 28 is replaced, the replacing amino acid is not glutamine or cysteine;

if position 15, 83 or 90 is replaced, the replacing amino acid is not serine, cysteine, or threonine;

if position 29 is replaced, the replacing amino acid is not phenylalanine, asparagine, tyrosine, glutamine, valine, alanine, methionine, isoleucine, lysine, arginine, threonine, histidine, cysteine, or serine;

if position 31 is replaced, the replacing amino acid is not histidine, aspartic acid, alanine, methionine, asparagine, threonine, arginine, serine, or cysteine;

if position 18, 32, 55, 57, 60, 63, 84, 95, or 139 is replaced, the replacing amino acid is not valine;

if position 48, 73, or 143 is replaced, the replacing amino acid is not asparagine;

if position 97 or 122 is replaced, the replacing amino acid is not asparagine or cysteine;

if position 100 is replaced, the replacing amino acid is not glutamine;

if position 101 is replaced, the replacing amino acid is not phenylalanine, asparagine, glutamine, valine, alanine, methionine, isoleucine, lysine, glycine, arginine, threonine, histidine, cysteine, or serine;

if position 109 is replaced, the replacing amino acid is not serine or threonine; and

if position 133 is replaced, the replacing amino acid is not asparagine.

2. The modified interferon-γ

polypeptide of claim 1, wherein the replacements in an unmodified IFN-γ

polypeptide are at positions corresponding to any of amino acid positions 2, 7, 8, 10, 11, 14, 16, 27, 35, 36, 39, 44, 45, 51, 53, 54, 59, 72, 76, 80, 91, 92, 94, 98, 115, 117, 123, 125, 128, 131, 132, 134, 137, 138 and 142.

3. The modified interferon-γ

of claim 1, wherein;

the amino acid replacement or replacements correspond to positions selected from among positions Y2, D5, P6, Y7, V8, K9, E10, A11, E12, L14, K15, K16, Y17, F18, D24, D27, N28, G29, L31, F32, I35, L36, W39, D44, R45, M48, Q51, V53, S54, F55, F57, L59, F60, N62, F63, K71, S72, V73, E74, T75, I76, K77, E78, D79, M80, K83, F84, K89, K90, K91, R92, D93, D94, F95, E96, K97, L98, T99, N100, Y101, D105, L106, Q109, E115, I117, E122, L123, P125, K128, K131, R132, K133, R134, M137, L138, F139, R142 and R143 of the mature human interferon-γ

polypeptide.

4. The modified interferon-γ

of claim 1, wherein the amino acid replacement or replacements are selected from among Y2H, Y2I, D5N, D5Q, P6A, P6S, Y7H, Y7I, Y7E, Y7D, Y7K, Y7R, Y7N, Y7Q, Y7S, Y7T, V8E, V8D, V8K, V8R, V8N, V8Q, V8S, V8T, K9N, E10Q, E10H, E10N, A11E, A11D, A11K, A11R, A11N, A11Q, A11S, A11T, E12Q, E12H, E12N, L14I, L14V, L14E, L14D, L14K, L14R, L14N, L14Q, L14S, L14T, K15N, K15Q, K16N, K16Q, Y17H, Y17I, Y17E, Y17D, Y17K, Y17R, Y17N, Y17Q, Y17S, Y17T, F18I, F18E, F18D, F18K, F18R, F18N, F18Q, F18S, F18T, D24N, D24Q, D27N, D27Q, N28S, G29P, L31I, L31V, F32I, I35E, I35D, I35K, I35R, I35N, I35Q, I35S, I35T, L36I, L36V, L36E, L36D, L36K, L36R, L36N, L36Q, L36S, L36T, W39H, W39S, D44N, D44Q, R45H, R45Q, M48E, M48D, M48K, M48R, M48Q, M48S, M48T, Q51E, Q51D, Q51K, Q51R, V53E, V53D, V53K, V53R, V53N, V53Q, V53S, V53T, S54E, S54D, S54K, S54R, S54N, S54Q, S54T, F55E, F55D, F55K, F55R, F55N, F55Q, F55S, F55T, F57I, F57E, F57D, F57K, F57R, F57N, F57Q, F57S, F57T, L59I, L59V, L59E, L59D, L59K, L59R, L59N, L59Q, L59S, L59T, F60I, F60E, F60D, F60K, F60R, F60N, F60Q, F60S, F60T, N62E, N62D, N62K, N62R, F63I, K71N, K71Q, S72E, S72D, S72K, S72R, S72N, S72Q, S72T, V73E, V73D, V73K, V73R, V73Q, V73S, V73T, E74Q, E74H, E74N, T75E, T75D, T75K, T75R, T75N, T75Q, T75S, I76E, I76D, I76K, I76R, I76N, I76Q, I76S, I76T, K77N, K77Q, E78Q, E78H, E78N, D79N, D79Q, M80E, M80D, M80K, M80R, M80N, M80Q, M80S, M80T, K83N, K83Q, F84I, F84E, F84D, F84K, F84R, F84N, F84Q, F84S, F84T, K89N, K89Q, K90N, K90Q, K91N, K91Q, R92H, R92Q, D93N, D93Q, D94N, D94Q, F95I, F95E, F95D, F95K, F95R, F95N, F95Q, F95S, F95T, E96Q, E96H, E96N, K97Q, L98I, L98V, L98E, L98D, L98K, L98R, L98N, L98Q, L98S, L98T, T99E, T99D, T99K, T99R, T99N, T99Q, T99S, N100A, D105N, D105Q, L106I, L106V, Q109E, Q109D, Q109K, Q109R, Q109N, E115Q, E115H, E115N, I117E, I117D, I117K, I117R, I117N, I117Q, I117S, I117T, E122Q, E122H, L123I, L123V, P125A, P125S, K128N, K128Q, K131N, K131Q, R132H, R132Q, K133Q, R134H, R134Q, M137I, M137V, L138I, L138V, F139I, R142H, R142Q, R143H, and R143Q.

5. The modified interferon-γ

of claim 4, wherein;

the amino acid replacement or replacements is (are) selected from among Y2H, Y2I, D5N, D5Q, P6A, P6S, Y7H, Y7I, K9N, E10Q, E10H, E10N, E12Q, E12H, E12N, L14I, L14V, K15N, K15Q, K16N, K16Q, Y17H, Y17I, F18I, D24N, D24Q, D27N, D27Q, N28S, L31I, L31V, F32I, L36I, L36V, W39H, W39S, D44N, D44Q, R45H, R45Q, F57I, L59I, L59V, F60I, F63I, K71N, K71Q, E74Q, E74H, E74N, K77N, K77Q, E78Q, E78H, E78N, D79N, D79Q, K83N, K83Q, F84I, K89N, K89Q, K90N, K90Q, K91N, K91Q, R92H, R92Q, D93N, D93Q, D94N, D94Q, F95I, E96Q, E96H, E96N, K97Q, L98I, L98V, D105N, D105Q, L106I, L106V, E115Q, E115H, E115N, E122Q, E122H, L123I, L123V, P125A, P125S, K128N, K128Q, K131N, K131Q, R132H, R132Q, K133Q, R134H, R134Q, M137I, M137V, L138I, L138V, F139I, R142H, R142Q, R143H, and R143Q; and

the modified polypeptide exhibits increased resistance to proteolysis.

6. The modified interferon-γ

of claim 5, wherein the amino acid replacement or replacements is (are) selected from among P6A, P6S, Y7I, E10Q, E10H, K16Q, Y17H, Y17I, F18I, F60I, F63I, K71N, K71Q, D79N, K89N, K89Q, K90N, K90Q, E96H, E96N, K97Q, L98I, D105N, L106I, L106V, P125A, P125S, K128N, K128Q, R132H, R132Q, K133Q, R134H, R134Q, M137I, M137V, L138I, L138V, F139I, F139V, R142H, R142Q, R143H, and R143Q.

7. The modified interferon-γ

of claim 5, wherein the amino acid replacement or replacements is (are) selected from among F63I, K89N, K89Q, K90N, K90Q, E96Q, E96H, E96N, L98I, L98V, D105N, D105Q, L106I, L106V, P125A, P125S, K133Q, R134H, R134Q, M137V, L138V, F139I, R142H, R142Q, R143H, and R143Q.

8. The modified interferon-γ

of claim 5, wherein the amino acid replacement or replacements is (are) selected from among F63I, K89N, K89Q, K90N, E96H, E96N, L98I, D105N, L106I, L106V, P125A, P125S, K133Q, R134H, R134Q, M137V, L138V, F139I, F139V, R142H, R142Q, R143H, and R143Q.

9. The modified interferon-γ

polypeptide of claim 4, wherein;

the amino acid replacement or replacements is (are) selected from among Y7E, Y7D, Y7K, Y7R, Y7N, Y7Q, Y7S, Y7T, V8E, V8D, V8K, V8R, V8N, V8Q, V8S, V8T, A11E, A11D, A11K, A11R, A11N, A11Q, A11S, A11T, L14E, L14D, L14K, L14R, L14N, L14Q, L14S, L14T, Y17E, Y17D, Y17K, Y17R, Y17N, Y17Q, Y17S, Y17T, F18E, F18D, F18K, F18R, F18N, F18Q, F18S, F18T, I35E, I35D, I35K, I35R, I35N, I35Q, I35S, I35T, L36E, L36D, L36K, L36R, L36N, L36Q, L36S, L36T, M48E, M48D, M48K, M48R, M48Q, M48S, M48T, Q51E, Q51D, Q51K, Q51R, V53E, V53D, V53K, V53R, V53N, V53Q, V53S, V53T, S54E, S54D, S54K, S54R, S54N, S54Q, S54T, F55E, F55D, F55K, F55R, F55N, F55Q, F55S, F55T, F57E, F57D, F57K, F57R, F57N, F57Q, F57S, F57T, L59E, L59D, L59K, L59R, L59N, L59Q, L59S, L59T, F60E, F60D, F60K, F60R, F60N, F60Q, F60S, F60T, N62E, N62D, N62K, N62R, S72E, S72D, S72K, S72R, S72N, S72Q, S72T, V73E, V73D, V73K, V73R, V73Q, V73S, V73T, T75E, T75D, T75K, T75R, T75N, T75Q, T75S, I76E, I76D, I76K, I76R, I76N, I76Q, I76S, I76T, M80E, M80D, M80K, M80R, M80N, M80Q, M80S, M80T, F84E, F84D, F84K, F84R, F84N, F84Q, F84S, F84T, F95E, F95D, F95K, F95R, F95N, F95Q, F95S, F95T, L98E, L98D, L98K, L98R, L98N, L98Q, L98S, L98T, T99E, T99D, T99K, T99R, T99N, T99Q, T99S, Q109E, Q109D, Q109K, Q109R, I117E, I117D, I117K, I117R, I117N, I117Q, I117S and I117T.

10. The modified interferon-γ

polypeptide of claim 9, wherein;

the amino acid replacement or replacements is (are) selected from among Y7E, Y7D, Y7K, Y7R, Y7N, Y7Q, Y7S, Y7T, A11E, A11D, A11K, A11R, A11N, A11Q, A11S, A11T, L14E, L14D, L14K, L14R, L14N, L14Q, L14S, L14T, Y17E, Y17D, Y17K, Y17R, Y17N, Y17Q, Y17S, Y17T, L36E, L36D, L36K, L36R, L36N, L36Q, L36S, L36T, V53E, V53D, V53K, V53R, V53N, V53Q, V53S, V53T, F57E, F57D, F57K, F57R, F57N, F57Q, F57S, F57T, F60E, F60D, F60K, F60R, F60N, F60Q, F60S, F60T, S72E, S72D, S72K, S72R, S72N, S72Q, S72T, V73E, V73D, V73K, V73R, V73Q, V73S, V73T, T75E, T75D, T75K, T75R, T75N, T75Q, T75S, I76E, I76D, I76K, I76R, I76N, I76Q, I76S, I76T, M80E, M80D, M80K, M80R, M80N, M80Q, M80S, M80T, F84E, F84D, F84K, F84R, F84N, F84Q, F84S, and F84T; and

the modified polypeptide exhibits increased intra-stability of the polypeptide monomer.

11. The modified interferon-γ

polypeptide of claim 9, wherein;

the amino acid replacement or replacements is (are) selected from among Y7E, Y7D, Y7K, Y7R, Y7N, Y7Q, Y7S, Y7T, V8E, V8D, V8K, V8R, V8N, V8Q, V8S, V8T, A11E, A11D, A11K, A11R, A11N, A11Q, A11S, A11T, L14E, L14D, L14K, L14R, L14N, L14Q, L14S, L14T, F18E, F18D, F18K, F18R, F18N, F18Q, F18S, F18T, I35E, I35D, I35K, I35R, I35N, I35Q, I35S, I35T, M48E, M48D, M48K, M48R, M48N, M48Q, M48S, M48T, Q51E, Q51D, Q51K, Q51R, S54E, S54D, S54K, S54R, S54N, S54Q, S54T, F55E, F55D, F55K, F55R, F55N, F55Q, F55S, F55T, L59E, L59D, L59K, L59R, L59N, L59Q, L59S, L59T, N62E, N62D, N62K, N62R, F95E, F95D, F95K, F95R, F95N, F95Q, F95S, F95T, L98E, L98D, L98K, L98R, L98N, L98Q, L98S, L98T, T99E, T99D, T99K, T99R, T99N, T99Q, T99S, Q109E, Q109D, Q109K, Q109R, I117E, I117D, I117K, I117R, I117N, I117Q, I117S and I117T; and

the modified polypeptide exhibits increased inter-stability compared to an unmodified IFN-γ

polypeptide.

12. The modified interferon-γ

polypeptide of claim 4, wherein;

the amino acid replacement or replacements is (are) selected from among N28A, N28K, G29P, M48E, M48D, M48K, M48R, M48N, M48Q, M48S, M48T, Q51E, Q51D, Q51K, Q51R, S54E, S54D, S54K, S54R, S54N, S54Q, S54T, F55E, F55D, F55K, F55R, F55N, F55Q, F55S, F55T, N62E, N62D, N62K, N62R, F95E, F95D, F95K, F95R, F95N, F95Q, F95S, F95T, L98E, L98D, L98K, L98R, L98N, L98Q, L98S, L98T, T99E, T99D, T99K, T99R, T99N, T99Q, T99S, and N100A; and

the modified interferon-γ

polypeptide exhibits increased stability around glycosylation sites.

13. The modified interferon-γ

polypeptide of claim 12, wherein the amino acid replacements are N28A and N100A.

14. The modified interferon-γ

polypeptide of claim 12, wherein the amino acid replacements are N28K and G29P.

17. The modified interferon-γ

polypeptide of claim 1 or claim 15, wherein the modified interferon-γ

further comprises a modification in one or more of positions corresponding to positions 5, 9, 28, 33, 37, 40, 41, 42, 58, 61, 64-66, 86, 88, 124, 127, 128, 133 and 140 in a mature interferon-γ

polypeptide having a sequence of amino acids set forth in SEQ ID NO;

1.

18. The modified interferon-γ

of claim 17, wherein the further modifications are selected from among any one or more of amino acid replacements corresponding to D5N, K9Q, N28S, N28A, N28H, L33I, L33V, K37N, K37Q, K40N, K40Q, E41H, E41N, E41Q, E42Q, E42H, E42N, K58N, K58Q, K61N, K61Q, K64N, K64Q, D65N, D65Q, D66N, D66Q, N86D, N88D, S124P, K128E, K133T and Q140R.

19. The modified interferon-γ

of claim 1 or claim 15, wherein the unmodified interferon-γ

polypeptide has a sequence of amino acids set forth in SEQ ID NO;

1 or SEQ ID NO;

2.

20. The modified interferon-γ

of claim 1 or claim 15 that is a human interferon-γ

.

21. The modified interferon-γ

of claim 1 that has a length of 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169 or 170 amino acids, or combinations thereof.

23. The modified interferon-γ

of claim 1 that is 132, 143 or 146 amino acids in length.

25. The modified interferon-γ

of claim 1 or claim 15, wherein the one or more amino acid replacements are selected from among natural amino acids, non-natural amino acids and a combination of natural and non-natural amino acids.

26. The modified interferon-γ

polypeptide of claim 1, wherein only the primary sequence is modified and the polypeptide exhibits increased protein stability.

28. The modified interferon-γ

of claim 1, wherein the interferon-γ

is pegylated, albuminated, or glycosylated.

30. The modified interferon-γ

of claim 1 or claim 15, wherein increased stability is manifested as increased resistance to proteolysis.

31. The modified interferon-γ

of claim 30, wherein the increased resistance to proteolysis occurs in serum, blood, saliva, digestive fluids or in vitro when exposed to one or more proteases.

32. The modified interferon-γ

of claim 30, wherein the increased resistance to proteolysis is exhibited by the modified interferon-γ

when it is administered orally or is present in the digestive tract.

33. The modified interferon-γ

of claim 31, wherein the one or more proteases is selected from among trypsin, trypsin (Arg blocked), trypsin (Lys blocked), clostripain, endoproteinase Asp-N, chymotrypsin, cyanogen bromide, iodozobenzoate, Myxobacter P., Armillaria, luminal pepsin, microvillar endopeptidase, dipeptidyl peptidase, enteropeptidase, hydrolase, pepsin, elastase, aminopeptidase, gelatinase B, gelatinase A, α

-chymotrypsin, carboxypeptidase, endoproteinase Arg-C, endoproteinase Asp-N, endoproteinase Glu-C, endoproteinase Lys-C, NS3, elastase, factor Xa, Granzyme B, thrombin, plasmin, urokinase, tPA and PSA.

34. The modified interferon-γ

of claim 1, wherein the increased stability is manifested as increased thermal tolerance.

36. The modified interferon-γ

of claim 1 or claim 15, wherein the increased stability is manifested as an increased half-life in vivo or in vitro or as an increased half-life when administered to a subject.

37. The modified interferon-γ

of claim 1 or claim 15 that comprises a signal peptide.

38. The modified interferon-γ

of claim 37, wherein the signal peptide is amino acids 1-20 of the sequence of amino acids set forth in SEQ ID NO;

370 or 371.

39. The modified interferon-γ

of claim 1 or claim 15 that is produced in mammalian cells or in insect cells.

40. The modified interferon-γ

of claim 1 or claim 15 that is produced in E. coli.

41. The modified interferon-γ

of claim 1 that has a single mutation compared to the unmodified interferon-γ

, wherein the unmodified is a native interferon-γ

.

42. The modified interferon-γ

of claim 1 or claim 15 that has 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 mutations compared to the unmodified interferon-γ

, wherein the unmodified is a native interferon-γ

.

43. The modified interferon-γ

of claim 1 or claim 15 that further contains mutations to optimize one or more glycosylation sites.

44. The modified interferon-γ

of claim 1 or claim 15 that is a dimer, wherein the dimer is either a homodimer or a heterodimer, comprising interferon-γ

.

45. The modified interferon-γ

of claim 44, wherein the dimer is a fusion protein, and wherein the two interferon-γ

monomers are linked directly or indirectly via linker, via covalent or via non-covalent linkages.

46. The modified interferon-γ

of claim 1 or claim 15 that is monomer.

48. A library, comprising two, three, four, five, six, 10, 50, 100, or more modified interferon-γ

polypeptides of claim 1 or claim 15.

49. A nucleic acid molecule, comprising a sequence of nucleic acids encoding a modified interferon-γ

polypeptide of claim 1 or claim 15.

50. A vector, comprising the nucleic acid molecule of claim 49.

51. A eukaryotic cell, comprising the vector of claim 50.

52. A prokaryotic cell, comprising the vector of claim 50.

53. A method for expressing a modified interferon-γ

, comprising;

i) introducing a vector of claim 50 into a cell; and

ii) culturing the cell under conditions in which the encoded modified interferon-γ

polypeptide is expressed.

54. A pharmaceutical composition, comprising the modified interferon-γ

of claim 1 or claim 15 in a pharmaceutically acceptable excipient.

55. The pharmaceutical composition of claim 54, wherein the pharmaceutical composition is formulated for oral, nasal or pulmonary administration.

56. The pharmaceutical composition of claim 54, wherein the pharmaceutical composition is formulated for oral administration.

57. The pharmaceutical composition of claim 56, wherein the pharmaceutical composition does not contain exogenously added protease inhibitors.

58. The pharmaceutical composition of claim 56, wherein the pharmaceutical composition is formulated for administration in a form selected from among a liquid, a pill, a tablet and a capsule.

59. A pharmaceutical composition, comprising a nucleic acid molecule of claim 49 in a pharmaceutically acceptable excipient.

60. A method, comprising administering a pharmaceutical composition of claim 54 to a subject who has a disease or condition that is treated by administration of interferon-γ

.

61. The method of claim 60, wherein the disease or condition is selected from among a viral infection, a bacterial infection, a fungal infection, a protozoa infection, a cancer or a cancer-associated condition, idiopathic pulmonary fibrosis, a fibrotic condition, a hyper-IgE condition, malignant osteopetrosis and chronic granulomatous.

62. The method of claim 61, wherein the viral infection is hepatitis C or human immunodeficiency virus (HIV).

63. The method of claim 61, wherein the cancer-associated condition is neutropenia or hemopoietic cell transplantation, or the fungal infection is aspergillosis or candidemia.

64. A method, comprising administering a pharmaceutical composition of claim 56 to a subject who has a disease or condition that is treated by administration of interferon-γ

.

65. The method of claim 64, wherein the disease or condition is selected from among a viral infection, a bacterial infection, a fungal infection, a protozoa infection, a cancer or a cancer-associated condition, idiopathic pulmonary fibrosis, a fibrotic condition, a hyper-IgE condition, malignant osteopetrosis and chronic granulomatous.

66. The method of claim 65, wherein the viral infection is hepatitis C or human immunodeficiency virus (HIV).

67. The method of claim 65, wherein the cancer-associated condition is neutropenia or hemopoietic cell transplantation, or the fungal infection is aspergillosis or candidemia.

15. A modified human interferon-γ

polypeptide, comprising two or more amino acid replacements in an unmodified IFN-γ

polypeptide at positions corresponding to any of amino acid positions of a mature interferon-γ

polypeptide, wherein;

the mature human interferon-γ

comprises the sequence of amino acids set forth in SEQ ID NO;

1; and

the modified interferon-γ

exhibits increased protein stability compared to the unmodified interferon-γ

polypeptide.

16. The modified interferon-γ

polypeptide of claim 15, that comprises 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 amino acid replacements in an unmodified interferon-γ

polypeptide.

22. The modified interferon-γ

of claim 15 that has a length of 124, 125, 126, 127, 128, 129, 130, 131, 132, 133, 134, 135, 136, 137, 138, 139, 140, 141, 142, 143, 144, 145, 146, 147, 148, 149, 150, 151, 152, 153, 154, 155, 156, 157, 158, 159, 160, 161, 162, 163, 164, 165, 166, 167, 168, 169 or 170 amino acids, or combinations thereof.

24. The modified interferon-γ

of claim 15 that is 132, 143 or 146 amino acids in length.

27. The modified interferon-γ

polypeptide of claim 15, wherein only the primary sequence is modified and the polypeptide exhibits increased protein stability.

29. The modified interferon-γ

of claim 15, wherein the interferon-γ

is pegylated, albuminated, or glycosylated.

35. The modified interferon-γ

of claim 15, wherein the increased stability is manifested as increased thermal tolerance.

47. A modified interferon-γ

, comprising any of the sequences of amino acids set forth in SEQ ID NOS;

3-11, 13-27, 29-32, 34-37, 41, 42, 45, 46, 55-59, 63-65, 69, 77-91, 93-105, 107-109, 111-113, 116-124, 126-135, 137-144, 146-217, 219-239, 241-350, 354-361, 368 and 369, or an active portion thereof.