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Literature summary for 6.6.1.1 extracted from

  • Hansson, A.; Willows, R.D.; Roberts, T.H.; Hansson, M.
    Three semidominant barley mutants with single amino acid substitutions in the smallest magnesium chelatase subunit form defective AAA+ hexamers (2002), Proc. Natl. Acad. Sci. USA, 99, 13944-13949.
    View publication on PubMedView publication on EuropePMC

Protein Variants

Protein Variants Comment Organism
D207N altered restriction enzyme site, no measurable magnesium chelatase activity, ATPase activity not affected Hordeum vulgare
L111F altered restriction enzyme site, no measurable magnesium chelatase activity, ATPase activity not affected Hordeum vulgare
R298K altered restriction enzyme site, no measurable magnesium chelatase activity, ATPase activity not affected Hordeum vulgare

KM Value [mM]

KM Value [mM] KM Value Maximum [mM] Substrate Comment Organism Structure
0.026
-
ATP pH 8.5, 32ºC Hordeum vulgare

Natural Substrates/ Products (Substrates)

Natural Substrates Organism Comment (Nat. Sub.) Natural Products Comment (Nat. Pro.) Rev. Reac.
ATP + protoporphyrin IX + Mg2+ + H2O Hordeum vulgare
-
ADP + phosphate + Mg-protoporphyrin IX + H+
-
?

Organism

Organism UniProt Comment Textmining
Hordeum vulgare
-
barley
-

Reaction

Reaction Comment Organism Reaction ID
ATP + protoporphyrin IX + Mg2+ + H2O = ADP + phosphate + Mg-protoporphyrin IX + 2 H+ this is the first committed step of chlorophyll biosynthesis and is a branchpoint of two major routes in the tetrapyrrole pathway Hordeum vulgare

Source Tissue

Source Tissue Comment Organism Textmining
caryopsis
-
Hordeum vulgare
-

Substrates and Products (Substrate)

Substrates Comment Substrates Organism Products Comment (Products) Rev. Reac.
ATP + protoporphyrin IX + Mg2+ + H2O
-
Hordeum vulgare ADP + phosphate + Mg-protoporphyrin IX + H+
-
?

Subunits

Subunits Comment Organism
? x * 90000-130000, gel filtration, BchI subunit Hordeum vulgare

Temperature Optimum [°C]

Temperature Optimum [°C] Temperature Optimum Maximum [°C] Comment Organism
32
-
assay at Hordeum vulgare