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CATH Superfamily 3.40.50.1980

Nitrogenase molybdenum iron protein domain

The name of this superfamily has been modified since the most recent official CATH+ release (v4_2_0). At the point of the last release, this superfamily was named:

"
Nitrogenase molybdenum iron protein domain
".

Functional Families

Overview of the Structural Clusters (SC) and Functional Families within this CATH Superfamily. Clusters with a representative structure are represented by a filled circle.
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FunFam 29567: Protochlorophyllide reductase subunit B

There are 4 EC terms in this cluster

Please note: EC annotations are assigned to the full protein sequence rather than individual protein domains. Since a given protein can contain multiple domains, it is possible that some of the annotations below come from additional domains that occur in the same protein, but have been classified elsewhere in CATH.

Note: The search results have been sorted with the annotations that are found most frequently at the top of the list. The results can be filtered by typing text into the search box at the top of the table.

EC Term Annotations Evidence
Ferredoxin:protochlorophyllide reductase (ATP-dependent). [EC: 1.3.7.7]
Protochlorophyllide a + reduced ferredoxin + 2 ATP + 2 H(2)O = chlorophyllide a + oxidized ferredoxin + 2 ADP + 2 phosphate.
  • Occurs in photosynthetic bacteria, cyanobacteria, green algae and gymnosperms.
  • The enzyme catalyzes trans-reduction of the D-ring of protochlorophyllide; the product has the (7S,8S)-configuration.
  • Unlike EC 1.3.1.33 light is not required.
  • The enzyme contains a [4Fe-4S] cluster, and structurally resembles the Fe protein/MoFe protein complex of EC 1.18.6.1, which catalyzes an ATP-driven reduction.
 2034 A0A023HHU5 A0A023HHU5 A0A023HQR3 A0A023HQR3 A0A023PLL8 A0A023PLL8 A0A024B3I2 A0A024B3I2 A0A024B3S3 A0A024B3S3
(2024 more...)
Nitrogenase. [EC: 1.18.6.1]
8 reduced ferredoxin + 8 H(+) + N(2) + 16 ATP + 16 H(2)O = 8 oxidized ferredoxin + H(2) + 2 NH(3) + 16 ADP + 16 phosphate.
  • Composed of two proteins that can be separated but are both required for nitrogenase activity.
  • Dinitrogen reductase is a [4Fe-4S] protein, which, with two molecules of ATP and ferredoxin, generates an electron.
  • The electron is transferred to the other protein, dinitrogenase (molybdoferredoxin).
  • Dinitrogenase is a molybdenum-iron protein that reduces dinitrogen in three succesive two-electron reductions from nitrogen to diimine to hydrazine to two molecules of ammonia; the molybdenum may be replaced by vanadium or iron.
  • The reduction is initiated by formation of hydrogen in stoichiometric amounts.
  • Acetylene is reduced to ethylene (but only very slowly to ethane), azide to nitrogen and ammonia, and cyanide to methane and ammonia.
  • In the absence of a suitable substrate, hydrogen is slowly formed.
  • Ferredoxin may be replaced by flavodoxin (see EC 1.19.6.1).
  • Formerly EC 1.18.2.1.
 1626 A0A011PCH4 A0A011PCH4 A0A011QJ53 A0A011QJ53 A0A023XXU5 A0A023XXU5 A0A060I7U7 A0A060I7U7 A0A060UNR3 A0A060UNR3
(1616 more...)
Protochlorophyllide reductase. [EC: 1.3.1.33]
Chlorophyllide a + NADP(+) = protochlorophyllide + NADPH.
  • Catalyzes a light-dependent trans-reduction of the D-ring of protochlorophyllide; the product has the (7S,8S)-configuration.
 26 A0A0D6B8I8 A0A0D6B8I8 A5EQA1 A5EQA1 A8LQ12 A8LQ12 B3Q7A6 B3Q7A6 H0S7J4 H0S7J4
(16 more...)
Chlorophyllide a reductase. [EC: 1.3.7.15]
(1) 3-deacetyl-3-vinylbacteriochlorophyllide a + 2 oxidized ferredoxin [iron-sulfur] cluster + ADP + phosphate = chlorophyllide a + 2 reduced ferredoxin [iron-sulfur] cluster + ATP + H(2)O + 2 H(+). (2) Bacteriochlorophyllide a + 2 oxidized ferredoxin [iron-sulfur] cluster + ADP + phosphate = 3-acetyl-3-devinylchlorophyllide a + 2 reduced ferredoxin [iron-sulfur] cluster + ATP + H(2)O + 2 H(+). (3) 3-deacetyl-3-(1-hydroxyethyl)bacteriochlorophyllide a + 2 oxidized ferredoxin [iron-sulfur] cluster + ADP + phosphate = 3-devinyl-3- (1-hydroxyethyl)chlorophyllide a + 2 reduced ferredoxin [iron-sulfur] cluster + ATP + H(2)O + 2 H(+).
  • The enzyme, together with EC 1.1.1.396 and EC 4.2.1.165, is involved in the conversion of chlorophyllide a to bacteriochlorophyllide a.
  • These enzymes can act in multiple orders, resulting in the formation of different intermediates, but the final product of the cumulative action of the three enzymes is always bacteriochlorophyllide a.
  • This enzyme catalyzes a trans-reduction of the B-ring; the product has the (7R,8R)-configuration.
  • In addition, the enzyme has a latent activity of EC 1.3.7.13.
  • Formerly EC 1.3.99.35.
 20 A0A089NSP3 A0A089NSP3 A0A0E2PGC3 A0A0E2PGC3 A0A1L6YE83 A0A1L6YE83 A0A1L9NUL0 A0A1L9NUL0 P0C0X6 P0C0X6
(10 more...)