Research Article
“In Silico” Characterization of 3-Phytase A and 3-Phytase B from Aspergillus niger
Table 1
Physicochemical properties of the two reported and revised phytases from A. niger.
| | Physical and chemical properties | 3-Phytase A (monomer) | 3-Phytase B (chain A, Homodimer) | | (ProtParam) | PDB ID: 3K4Q | PDB ID: 1QFX |
| | aa sequence length | 467 | 479 | | Signal peptide length | 23 | 19 | | Mature protein length | 444 | 460 |
| | Molecular Weight (kDa) | 48,84 | 58,78 |
| | Instability Index | 45,41 (Unstable) | 33,66 (Stable) |
| | Disulfide bond | 5 (Intrachain) in positions: | 5 (Intrachain) in positions: | | Cys8–Cys17 | Cys52–Cys368 | | Cys48–Cys391 | Cys109–Cys453 | | Cys192–Cys442 | Cys197–Cys422 | | Cys241–Cys259 | Cys206–Cys279 | | Cys413–Cys421 | Cys394–Cys402 |
| | Theoretical Isoelectric Point (iP) | 4,94 | 4,6 |
| | Estimated Lifetime | 4,4 hours (Reticulocytes of mammals, in vitro) | 1,1 hours (Reticulocytes of mammals, in vitro) | | >20 hours (yeasts, in vivo) | 3 minutes (yeasts, in vivo) | | >10 hours (E. coli, in vivo) | 2 minutes (E. coli, in vivo) |
| | Aliphatic Index | 72,25 | 70,46 |
| | Average Hydropathicity (GRAVY) | −0,304 | −0,33 |
| | Amino acids composition | Ala (A) | 29 | 6.5% | Ala (A) | 40 | 8.7% | | Arg (R) | 19 | 4.3% | Arg (R) | 14 | 3.0% | | Asn (N) | 19 | 4.3% | Asn (N) | 38 | 8.3% | | Asp (D) | 29 | 6.5% | Asp (D) | 24 | 5.2% | | Cys (C) | 10 | 2.3% | Cys (C) | 10 | 2.2% | | Gln (Q) | 19 | 4.3% | Gln (Q) | 14 | 3.0% | | Glu (E) | 22 | 5.0% | Glu (E) | 24 | 5.2% | | Gly (G) | 30 | 6.8% | Gly (G) | 37 | 8.0% | | His (H) | 9 | 2.0% | His (H) | 6 | 1.3% | | Ile (I) | 18 | 4.1% | Ile (I) | 19 | 4.1% | | Leu (L) | 36 | 8.1% | Leu (L) | 36 | 7.8% | | Lys (K) | 15 | 3.4% | Lys (K) | 13 | 2.8% | | Met (M) | 4 | 0.9% | Met (M) | 7 | 1.5% | | Phe (F) | 25 | 5.6% | Phe (F) | 20 | 4.3% | | Pro (P) | 22 | 5.0% | Pro (P) | 27 | 5.9% | | Ser (S) | 49 | 11.0% | Ser (S) | 34 | 7.4% | | Thr (T) | 39 | 8.8% | Thr (T) | 32 | 7.0% | | Trp (W) | 4 | 0.9% | Trp (W) | 6 | 1.3% | | Tyr (Y) | 18 | 4.1% | Tyr (Y) | 35 | 7.6% | | Val (V) | 28 | 6.3% | Val (V) | 24 | 5.2% | | Pyl (O) | 0 | 0% | Pyl (O) | 0 | 0% | | Sec (U) | 0 | 0% | Sec (U) | 0 | 0% |
| | Total number (%) of negatively charged amino acids (Asp + Glu) | 51 (11.48%) | 48 (10.43%) |
| | Total number (%) of positively charged amino acids (Asp + Glu) | 34 (7.65%) | 27 (5.86%) |
|
|
