This domain is found at the C-terminus of a variety of large catalase enzymes from bacteria. Structurally it is related to class I glutamine amidotransferase domains. The precise molecular function of this domain is uncertain.

1: Mutants that alter the covalent structure of catalase hydroperoxidase II from Escherichia coli. Mate MJ, Sevinc MS, Hu B, Bujons J, Bravo J, Switala J, Ens W, Loewen PC, Fita I; J Biol Chem. 1999;274:27717-27725. PMID:10488114

2: Substrate flow in catalases deduced from the crystal structures of active site variants of HPII from Escherichia coli. Melik-Adamyan W, Bravo J, Carpena X, Switala J, Mate MJ, Fita I, Loewen PC; Proteins. 2001;44:270-281. PMID:11455600

3: Crystal structure of catalase HPII from Escherichia coli. Bravo J, Verdaguer N, Tormo J, Betzel C, Switala J, Loewen PC, Fita I; Structure. 1995;3:491-502. PMID:7663946

4: An electrical potential in the access channel of catalases enhances catalysis. Chelikani P, Carpena X, Fita I, Loewen PC; J Biol Chem. 2003;278:31290-31296. PMID:12777389

5: Modulation of heme orientation and binding by a single residue in catalase HPII of Escherichia coli. Jha V, Louis S, Chelikani P, Carpena X, Donald LJ, Fita I, Loewen PC; Biochemistry. 2011;50:2101-2110. PMID:21332158

6: Mutation of Phe413 to Tyr in catalase KatE from Escherichia coli leads to side chain damage and main chain cleavage. Jha V, Donald LJ, Loewen PC; Arch Biochem Biophys. 2012;525:207-214. PMID:22172685

7: Post-transcriptional regulator Hfq binds catalase HPII: crystal structure of the complex. Yonekura K, Watanabe M, Kageyama Y, Hirata K, Yamamoto M, Maki-Yonekura S; PLoS One. 2013;8:e78216. PMID:24223139

8: Influence of main channel structure on H(2)O(2) access to the heme cavity of catalase KatE of Escherichia coli. Jha V, Chelikani P, Carpena X, Fita I, Loewen PC; Arch Biochem Biophys. 2012;526:54-59. PMID:22820098

9: Structure-function relationships in fungal large-subunit catalases. Diaz A, Valdes VJ, Rudino-Pinera E, Horjales E, Hansberg W; J Mol Biol. 2009;386:218-232. PMID:19109972

10: Conformational stability and crystal packing: polymorphism in Neurospora crassa CAT-3. Zarate-Romero A, Stojanoff V, Rojas-Trejo SP, Hansberg W, Rudino-Pinera E; Acta Crystallogr Sect F Struct Biol Cryst Commun. 2013;69:753-758. PMID:23832201

11: Unusual Cys-Tyr covalent bond in a large catalase. Diaz A, Horjales E, Rudino-Pinera E, Arreola R, Hansberg W; J Mol Biol. 2004;342:971-985. PMID:15342250