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Literature summary for 3.2.1.8 extracted from

  • Chen, N.J.; Paull, R.E.
    Endoxylanase expressed during papaya fruit ripening: purification, cloning and characterization (2003), Funct. Plant Biol., 30, 433-441.
    View publication on PubMed

Cloned(Commentary)

Cloned (Comment) Organism
library construction, cDNA isolation, DNA and amino acid sequence determination Carica papaya

Inhibitors

Inhibitors Comment Organism Structure
Ca2+
-
Carica papaya
Co2+
-
Carica papaya
Mg2+
-
Carica papaya
Mn2+
-
Carica papaya
additional information no inhibition by EDTA and DTT Carica papaya
SDS strong inhibition Carica papaya
Zn2+
-
Carica papaya

Localization

Localization Comment Organism GeneOntology No. Textmining
cell wall
-
Carica papaya 5618
-

Molecular Weight [Da]

Molecular Weight [Da] Molecular Weight Maximum [Da] Comment Organism
32500
-
x * 32500, purified mature enzyme, SDS-PAGE, x * 64960, unprocessed enzyme, amino acid sequence calculation Carica papaya
64960
-
x * 32500, purified mature enzyme, SDS-PAGE, x * 64960, unprocessed enzyme, amino acid sequence calculation Carica papaya

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
additional information Carica papaya enzyme is responsible for softening of fruits during ripening, it is involved in cell wall degradation ?
-
?

Organism

Organism UniProt Comment Textmining
Carica papaya Q8GTJ2 enzyme CpaEXY1
-

Posttranslational Modification

Posttranslational Modification Comment Organism
glycoprotein enzyme contains a predicted carbohydrate binding site Carica papaya
proteolytic modification the enzyme is post-translationally modified in the cell wall serving for regulation of the enzyme activity and cell wall-microdomain-specific hydrolysis Carica papaya

Purification (Commentary)

Purification (Comment) Organism
44871fold from ripe fruit mesocarp, to homogeneity Carica papaya

Source Tissue

Source Tissue Comment Organism Textmining
fruit ripe Carica papaya
-
mesocarp of ripe fruit Carica papaya
-
additional information developmentally expressed during fruit ripening Carica papaya
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
4-O-methyl-beta-D-glucuronoxylan + H2O soluble xylan, commercial substrate Carica papaya ?
-
?
additional information enzyme is responsible for softening of fruits during ripening, it is involved in cell wall degradation Carica papaya ?
-
?
xylan + H2O part of hemicelluloses in cell walls Carica papaya ?
-
?

Subunits

Subunits Comment Organism
? x * 32500, purified mature enzyme, SDS-PAGE, x * 64960, unprocessed enzyme, amino acid sequence calculation Carica papaya

Synonyms

Synonyms Comment Organism
endoxylanase
-
Carica papaya
EXY1
-
Carica papaya

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
45
-
about Carica papaya

Temperature Range [°C]

Temperature Minimum [°C] Temperature Maximum [°C] Comment Organism
additional information
-
rapid decline in activity above 45°C Carica papaya

pH Optimum

pH Optimum Minimum pH Optimum Maximum Comment Organism
5 7
-
Carica papaya