PhyA gene product of Aspergillus ficuum and Peniophora lycii produces dissimilar phytases.

Abstract:

:PhyA gene products of Aspergillus ficuum (AF) and Peniophora lycii (PL) as expressed in industrial strains of Aspergillus niger and Aspergillus oryzae, respectively, were purified to homogeneity and then characterized for both physical and biochemical properties. The PL phytase is 26 amino acid residues shorter than the AF phytase. Dynamic light scattering studies indicate that the active AF phytase is a monomer while the PL phytase is a dimer. While both of the phytases retained four identical glycosylatable Asn residues, unique glycosylation sites, six for PL and seven for AF phytase, were observed. Global alignment of both the phytases has shown 38% sequence homology between the two proteins. At 58 degrees C and pH 5.0, the PL phytase gave a specific activity of 22,000 nKat/mg as opposed to about 3000 nKat/mg for AF phytase. However, the AF phytase is more thermostable than its counterpart PL phytase at 65 degrees C. Also, AF phytase is more stable at pH 7.5 than the PL phytase. The two phytases differed in K(m) for phytate, K(i) for myo-inositol hexasulfate (MIHS), and pH optima profile. Despite similarities in the active site sequences, the two phytases show remarkable differences in turnover number, pH optima profile, stability at higher temperature, and alkaline pH. These biochemical differences indicate that phytases from ascomycete and basidiomycete fungi may have evolved to degrade phytate in different environments.

authors

Ullah AH,Sethumadhavan K

doi

10.1016/s0006-291x(03)00374-7

subject

Has Abstract

pub_date

2003-04-04 00:00:00

pages

463-8

issue

2

eissn

0006-291X

issn

1090-2104

pii

S0006291X03003747

journal_volume

303

pub_type

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