Allergen Data Collection - Update: Hen's Egg White (Gallus domesticus)
Internet Symposium on Food Allergens 2(1): 1-29 (2000) [http://www.food-allergens.de

7.3 Properties of Ovalbumin

7.3.1 Molecular Biological Properties
 
Ovalbumin (OA) References
Allergen Nomenclature  Gal d 2 (1) King et al. 1994
Isoallergens and Variants
Asn / Asp replacement at residue 311 (1)
(1) Nisbet et al. 1981
Molecular Mass   Mr 44.0-45.0 kDa
6 and 4  isoforms by mass spectrometry, respectively (1, 2)
(1) Kelly et al. 1996
(2) Chakel et a. 1997
Isoelectric Point  pI 4.6
(1) Holen & Elsayed 1990
Amino Acid Sequence, mRNA, and cDNA
Gal d 2  
SWISS-PROT: P01012
GenBank: J00895, V00438, V00383, M34352, M34346
PIR: A90455
Amino acids 385 residues (6)
mRNA 1859 bp (1), 1872 bp (4, 7)
cDNA 7.564 kb (2, 3, 5, 7)
(1) McReynolds et al. 1978
(2) Dugaiczyk et al. 1979
(3) Gannon et al. 1979
(4) O'Hare et al. 1979
(5) Caterall et al. 1980
(6) Nisbet et al. 1981
(7) Woo et al.1981
recombinant Protein
expression in Escherichia coli (1)
Japanese quail OA expression in Saccharomyces cerevisiae (7)
expression in mouse cells (2)
expression in Xenopus laevis oocytes (3)
OA and OA mutant expression in mouse L cells (5, 6)
expression in human breast carcinoma cell line (4)
(1) Fraser & Bruce 1978
(2) Lai et al. 1980
(3) Colman et al. 1981
(4) Lai et al. 1983
(5) Sheares & Robbins 1986
(6) Sheares 1988
(7) Krizkova et al. 1992
3D-Structure
X-ray studies of OA (1, 3)
X-ray of plakalbumin (2)
OA 257-264 in complex with the murine MHC class I H-2Kb molecule (4)
(1) Stein et al. 1990
(2) Wright et al. 1990
(3) Stein et al. 1991
(4) Fremont et al. 1995
Posttranslational Modifications
Acetylation:
N-terminal acetylation (3)

Disulfide Bridges:
1 disulfide bond: 73-120 (3)
4 free Cys residues

Glycosylation of OA:
carbohydrate content:  3.2% of whole Mr (1)
carbohydrate composition: 1.2% GlcNAc, 1.7-2.0% Man (1)
1 N-glycosylation site: Asn-292 (3) 
hydrazinolysis of sialyl-oligosaccharides and sialydase digestion (4) 
isolation and mass spectrometry of OA-glycans (5) 
purified glycopeptides characterized by sequential exoglycosidase digestion (9) 
sequential exoglycosidase digestion and mass spectrometry of glycans (11) 
transiently diglycosylated ovalbumin (Asn-292, Asn-311) in hen oviduct (12) 
glycosylation of  recombinant OA (6, 7) 

Phosphorylation of OA:
2 phosphorylation sites: Ser-68, Ser-344 (2, 3)
posphate content: 1.73 mol/mol OA (10)
variants: A1, A2, or A3 depending on 2, 1, or no phosphorylation, ratios A1:A2:A3 = 12:7:1 (8)
separation by capillary isoelectric focussing and mass spectrometry of mono- and diphospho-OA (13)

(1) Robinson 1972
(2) Henderson et al. 1981
(3) Nisbet et al. 1981
(4) Yamashita et al. 1984
(5) Chen et al. 1988
(6) Sheares & Robbins 1986
(7) Sheares 1988
(8) Burley & Vadehra 1989
(9) Rago et al. 1992
(10) Ekman & Jäger 1993
(11) Kuster et al. 1997
(12) Suzuki et al. 1997
(13) Wei et al. 1998
Biological Function
function unknown, OA belongs to serpin family of protease inhibitors (1)
active site: 352-353
(1) Burley & Vadehra 1989
Stability
conversion to S-Ovalbumin by heat or storage (1, 2)
5% S-form in fresh eggs, 81% in eggs stored for 6 months (1)
S-form more resistant to denaturation by heat, urea, or guanidine (2)
(1) Smith 1964
(2) Smith & Back 1965

7.3.2 Allergenic Properties
 
Ovalbumin (OA) References
Frequency of Sensitization
IgE-binding to OA in 9 to 100% of patients (1)
(1) see 6.1 Sensitization to Egg White Allergens
Immunoglobulines
IgM, IgG, IgE production by OA-specific B-Cells (1)
lower OA-specific IgA production in egg allergic children (2)
(1) Ohshiba & Yata 1991
(2) Noma et al. 1996a
B-Cell Epitopes
IgE binding sites located on:
OA 1-10 (synthetic peptide) (c) (1)
OA 11-19 (synthetic peptide) (c) (4)
OA 41-171 (CNBr-fragement) (a) (3)
OA 56-70 (synthetic peptide) (c) (4)
OA 301-385 (CNBr-fragment) (a) (3)
OA 323-339 (synthetic peptide) (b, c) (2)
OA 347-385 (V8 protease digest) (a) (5)
OA 347-366 (synthetic peptide) (d) (5)
OA 357-366 (synthetic peptide) (e) (5)
OA 357-376 (synthetic peptide) (d) (5)
OA 367-385 (synthetic peptide) (d) (5)
(1) Elsayed et al. 1988
(2) Johnsen & Elsayed 1990
(3) Kahlert et al. 1992
(4) Elsyed & Stavseng 1994
(5) Honma et al. 1996

Applied methods:
(a) SDS-PAGE / immunoblot
(b) CRIE
(c) EAST / RAST-inhibition
(d) Histamine Release
(e) Histamine Release inhibition

T-Cell Epitopes
Specific T-Cell Proliferation with: 
OA 1-33 (synthetic peptide) (3)
OA 105-122 (synthetic peptide) (2)
OA 198-231 (synthetic peptide) (3)
OA 201-213 (synthetic peptide) (3)
OA 261-277 (synthetic peptide) (3)
OA 323-339 (synthetic peptide) (1, 2) 

with whole OA (1, 2)

(1) Shimojo et al. 1994
(2) Holen & Elsayed 1996
(3) Katsuki et al. 1996
PBMC Proliferation
stimulation with OA
positive PBMC proliferation in 10 egg allergic patients (4)
decreased proliferation during elimination diets in egg allergic patients with atopic dermatitis (2)
higher proliferation in egg allergic patients with atopic dermatitis showing non-immediate symptoms to oral challenge than in patients showing immediate type symptoms (1, 3)
increased proliferation in allergy developing infants (5)
higher proliferation in egg allergic children with persisting symptoms of atopic dermatitis (6)
(1) Kondo et al. 1990
(2) Agata et al. 1993
(3) Fukutomi et al. 1994
(4) Eigenmann et al. 1996
(5) Miles et al. 1996
(6) Shinoda et al. 1997
PBMC Stimulation / Cytokines
PBMC stimulation with OA: 
increase of PBMC proliferation and decrease in IFN-gamma in egg allergic infants  with atopic dermatitis (1)
increase of  IL4 and decrease in IFN-gamma in egg allergic children with atopic dermatitis (not in outgrown and healthy children) (2)
increase of IFN-gamma (exclusively by simultaneous IL-2 stimulation) in egg allergic patients (3)
increase of IL-5 mRNA in egg allergic children (not in outgrown and healthy children) (4)
(1) Warner et al. 1994
(2) Noma et al. 1996b
(3) Shinbara et al. 1996
(4) Tomiita et al. 1998
T-Cell Lines (TCL) / Cytokines
OA-stimulated lymphocytes from egg allergic patients induced IL-2-responsiveness of T-Cells (CD4+),  induction  of T-Cell responsiveness inhibited by anti-HLA-DP and anti-HLA-DQ monoclonal antibodies (1, 3)

Antibody to CD45RA+ (CD4+  T-Cells) induced IL-2 responsiveness in  lymphocytes of non-allergic patients, but did not increase responsiveness in egg allergic patients (2)

Anti-HLA-DP monoclonal antibodies inhibited T-Cell proliferation in 5 egg allergic patients, anti-HLA-DQ monoclonal antibodies restored T-Cell proliferation in 2 egg allergic patients with atopic dermatitis (5)

OA-specific TCL ( CD4+, alpha beta T-Cell receptors) recognized OA presented by HLA-DR10, production of IL-5 on stimulation with OA or OA 323-339 observed (1 egg allergic patient) (4)

30 OA-specific TCL mainly CD4+ T-Cells significant production of  IL-4 and IL-5, low production of IFN-gamma (6 egg allergic patients with atopic dermatitis) (6)

28 OA- or casein-specific T-Cell clones (TCC) (16 CD8+) from egg and cow's milk allergic patient, 75% of CD4+ TCC and 44% of CD8+ TCC secreted IL-4 (7)

(1) Noma et al. 1990
(2) Kawano et al. 1992
(3) Noma et al. 1994
(4) Shimojo et al. 1994
(5) Shinbara et al. 1995
(6) Katsuki et al. 1996
(7) Reekers et al. 1996
Alteration of Allergenicity
Acidic treatment:
HCl, pH 3.0: increased IgE-binding in EAST (157% of binding to native OA, for IgG 122%, IgA 104%) (2)

Alkaline treatment:
NaOH, pH 11 overnight: decreased IgE-binding in EAST (0.4% of binding to native OA, for IgG 5.2%, IgA 27%) (2)

Cyanogen bromide cleavage:
decreased 50%-inhibition of IgE-binding in RAST (1)

Pepsin hydrolysis:
limited hydrolysis decreased IgE-binding (max. inhibition: 50%) in RAST (1)

Reduction and alkylation:
decreased IgE-binding (max. inhibition: 20%) in RAST (1)
no change in in IgE-binding in EAST (89% of binding to native OA, for IgG 100%, IgA 111%) (2)

Heat denaturation:
80°C, 10 min and treatment with urea or guanidine HCl resulted in no change in RAST inhibition (1)
100°C, 3 min: decreased IgE-binding in EAST (9.4% of binding to native OA, for IgG 39%, IgA 76%) (2)

Trypsin hydrolysis:
decreased 50%- inhibition of IgE-binding in RAST (1)

Urea denaturation:
increased IgE-binding in EAST (136% of binding to native OA, for IgG 120%, IgA 133%) (2)

(1) Elsayed et al. 1986
(2) Honma et al. 1994

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