Summary: Manganese containing catalase
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Manganese containing catalase Provide feedback
Catalases are important antioxidant metalloenzymes that catalyse disproportionation of hydrogen peroxide, forming dioxygen and water. Two families of catalases are known, one having a heme cofactor, and this family that is a structurally distinct family containing non-heme manganese .
Barynin VV, Whittaker MM, Antonyuk SV, Lamzin VS, Harrison PM, Artymiuk PJ, Whittaker JW; , Structure (Camb) 2001;9:725-738.: Crystal structure of manganese catalase from Lactobacillus plantarum. PUBMED:11587647 EPMC:11587647
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This tab holds annotation information from the InterPro database.
InterPro entry IPR007760
Catalases (EC) are antioxidant enzymes that catalyse the conversion of hydrogen peroxide to water and molecular oxygen. Hydrogen peroxide is produced as a consequence of oxidative cellular metabolism and can be converted to the highly reactive hydroxyl radical via transition metals, this radical being able to damage a wide variety of molecules within a cell, leading to oxidative stress and cell death. Catalases act to neutralise hydrogen peroxide toxicity, and are produced by all aerobic organisms ranging from bacteria to man. There are three structurally independent classes of catalases: ubiquitous mono-functional haem-containing catalases (INTERPRO), bifunctional haem-containing catalase-peroxidases that are closely related to plant peroxidases (INTERPRO), and non-haem manganese-containing catalases [PUBMED:14745498].
This entry represents the non-haem Mn-catalases, which are found in several bacterial species [PUBMED:14871145]. The structure of the Mn catalase from Lactobacillus plantarum reveals a homo-hexamer, where each subunit contains a dimanganese active site that is accessed by a single substrate channel [PUBMED:11587647]. The dimanganese active site performs a two-electron catalytic cycle that alternately oxidises and reduces the dimanganese atoms in a manner that is similar to its haem-counterpart found in other catalases.
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The members of this clan all share a distinctive four helical bundle. The four helices are arranged antiparallel with a left-handed twist. This helical bundle is distinguished from others by the long connection between the second and third helices. Some of the members contain a Fe or Mn dimer at the centre of the helical bundle. The ferritin fold was first described by Murzin AG and Chothia C, Cur Opin Struc Biol 1992, 2:895-903.
The clan contains the following 19 members:Coat_F COQ7 DUF2202 DUF2383 DUF305 DUF4142 DUF4439 DUF892 FA_desaturase_2 Ferritin Ferritin-like Ferritin_2 MiaE MiaE_2 Mn_catalase PaaA_PaaC Phenol_Hydrox Ribonuc_red_sm Rubrerythrin
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Curation and family details
|Number in seed:||6|
|Number in full:||4848|
|Average length of the domain:||239.10 aa|
|Average identity of full alignment:||42 %|
|Average coverage of the sequence by the domain:||97.66 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 80369284 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||8|
|Download:||download the raw HMM for this family|
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For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the Mn_catalase domain has been found. There are 24 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein seqence.
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