Medizinische Universität Graz Austria/Österreich - Forschungsportal - Medical University of Graz
Gewählte Publikation:
Gerdemann, C; Eicken, C; Magrini, A; Meyer, HE; Rompel, A; Spener, F; Krebs, B.
Isozymes of Ipomoea batatas catechol oxidase differ in catalase-like activity.
Biochim Biophys Acta. 2001; 1548(1):94-105
Doi: 10.1016/S0167-4838(01)00219-9
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- Co-Autor*innen der Med Uni Graz
- Spener Friedrich
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- Abstract:
- The amino acid sequences of two isozymes of catechol oxidase from sweet potatoes (Ipomoea batatas) were determined by Edman degradation of BrCN cleavage fragments of the native protein and by sequencing of amplified cDNA fragments. Sequence alignment and phylogenetic analysis of plant catechol oxidases revealed about 80% equidistance between the two I. batatas catechol oxidases and approximately 40--60% to catechol oxidases of other plants. When H(2)O(2) was applied as substrate the 39 kDa isozyme, but not the 40 kDa isozyme, showed catalase-like activity. The structure of the 40 kDa isozyme was modeled on the basis of the published crystal structure of the 39 kDa isozyme [T. Klabunde et al., Nat. Struct. Biol. 5 (1998) 1084]. The active site model closely resembled that of the 39 kDa isozyme determined by crystallography, except for a mutation of Thr243 (40 kDa isozyme) to Ile241 (39 kDa isozyme) close to the dimetal center. This residue difference affects the orientation of the Glu238/236 residue, which is thought to be responsible for the catalase-like activity of the 39 kDa isozyme for which a catalytic mechanism is proposed.
- Find related publications in this database (using NLM MeSH Indexing)
- Amino Acid Sequence -
- Base Sequence -
- Binding Sites -
- Catalase - metabolism
- Catechol Oxidase - chemistry Catechol Oxidase - genetics Catechol Oxidase - metabolism
- DNA, Complementary - chemistry
- Isoenzymes - chemistry Isoenzymes - metabolism
- Models, Chemical -
- Models, Molecular -
- Molecular Sequence Data -
- Molecular Weight -
- Plants - enzymology
- Polymerase Chain Reaction -
- Sequence Alignment -
- Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization -
- Find related publications in this database (Keywords)
- catechol oxidase
- polyphenol oxidase
- tyrosinase
- amino acid sequence
- sweet potato
- Ipomoea batatas