Protein Domain : IPR016166

Type:  Domain Name:  FAD-binding, type 2
Description:  This entry represents a FAD-binding domain that consists of two alpha+beta subdomains. Flavoenzymes have the ability to catalyse a wide range of biochemical reactions. They are involved in the dehydrogenation of a variety of metabolites, in electron transfer from and to redox centres, in light emission, in the activation of oxygen for oxidation and hydroxylation reactions []. About 1% of all eukaryotic and prokaryotic proteins are predicted to encode a flavin adenine dinucleotide (FAD)-binding domain [].According to structural similarities and conserved sequence motifs,FAD-binding domains have been grouped in three main families: (i) theferredoxin reductase (FR)-type FAD-binding domain (see ),(ii) the FAD-binding domains that adopt a Rossmann fold and (iii) the p-cresol methylhydroxylase (PCMH)-type FAD-binding domain [].The FAD cofactor consists of adenosine monophosphate (AMP) linked to flavin mononucleotide (FMN) by a pyrophosphate bond. The AMP moiety is composed of the adenine ring bonded to a ribose that is linked to a phosphate group. The FMN moiety is composed of the isoalloxazine-flavin ring linked to a ribitol, which is connected to a phosphate group. The flavin functions mainly in a redox capacity, being able to take up two electrons from one substrate and release them two at a time to a substrate or coenzyme, or one at a time to an electron acceptor. The catalytic function of the FAD is concentrated in the isoalloxazine ring, whereas the ribityl phosphate and the AMP moiety mainly stabilise cofactor binding to protein residues [].The PCMH-type FAD-binding domain consists of two alpha-beta subdomains: one is composed of three parallel beta-strands (B1-B3) surrounded by alpha-helices, and is packed against the second subdomain containing five antiparallel beta-strands (B4-B8) surrounded by alpha-helices []. The two subdomains accommodate the FAD cofactor between them []. In the PCMH proteins the coenzyme FAD is also covalently attached to a tyrosine located outside the FAD-binding domain in the C-terminal catalytic domain [].This domain is found in: FAD-linked oxidases (N-terminal domain), such as vanillyl-alochol oxidase () [], flavoprotein subunit of p-cresol methylhydroxylase () [], D-lactate dehydrogenases (, -cytochrome) [], cholesterol oxidases () [], and cytokinin dehydrogenase 1 () [].Uridine diphospho-N-acetylenolpyruvylglucosamine reductase (MurB) (N-terminal domain) [].CO dehydrogenase flavoprotein (N-terminal domain; []) family, which includes xanthine oxidase (domain 3) () [], subunit A of xanthine dehydrogenase (domain 3) () [], medium subunit of quinoline 2-oxidoreductase (QorM) () [], and the beta-subunit of 4-hydroxybenzoyl-CoA reductase (HrcB) (N-terminal domain) () []. Short Name:  FAD-bd_2

2 Child Features

DB identifier Type Name
IPR006094 Domain FAD linked oxidase, N-terminal
IPR002346 Domain Molybdopterin dehydrogenase, FAD-binding

3 Contains

DB identifier Type Name
IPR016169 Domain CO dehydrogenase flavoprotein-like, FAD-binding, subdomain 2
IPR016167 Domain FAD-binding, type 2, subdomain 1
IPR006093 Binding_site Oxygen oxidoreductase covalent FAD-binding site

2 Cross Referencess

Identifier
PS51387
SSF56176

1 Found In

DB identifier Type Name
IPR017612 Family Xanthine dehydrogenase C subunit

4 GO Annotations

GO Term Gene Name
GO:0003824 IPR016166
GO:0016614 IPR016166
GO:0050660 IPR016166
GO:0055114 IPR016166

4 Ontology Annotations

GO Term Gene Name
GO:0003824 IPR016166
GO:0016614 IPR016166
GO:0050660 IPR016166
GO:0055114 IPR016166

0 Parent Features

3256 Proteins

DB identifier UniProt Accession Secondary Identifier Organism Name Length
410688 D8RFI9 PAC:15407192 Selaginella moellendorffii 414  
430460 D8T9H5 PAC:15420125 Selaginella moellendorffii 543  
411795 D8RJ24 PAC:15411109 Selaginella moellendorffii 292  
94673 D8RJ26 PAC:15403436 Selaginella moellendorffii 584  
412427 D8RLG6 PAC:15411531 Selaginella moellendorffii 310  
96875 D8RLG8 PAC:15410972 Selaginella moellendorffii 1334  
230086 D8QU47 PAC:15410927 Selaginella moellendorffii 536  
230122 D8QV38 PAC:15411537 Selaginella moellendorffii 559  
404365 D8QV36 PAC:15409463 Selaginella moellendorffii 401  
78233 D8QVE6 PAC:15419990 Selaginella moellendorffii 597  
79232 D8QVJ4 PAC:15422817 Selaginella moellendorffii 554  
97935 D8RNQ7 PAC:15414627 Selaginella moellendorffii 590  
98722 D8RNN8 PAC:15415925 Selaginella moellendorffii 539  
98882 D8RQN3 PAC:15416785 Selaginella moellendorffii 648  
98904 D8RQ51 PAC:15417373 Selaginella moellendorffii 568  
100820 D8RSD5 PAC:15403207 Selaginella moellendorffii 584  
174721 D8RVP4 PAC:15419951 Selaginella moellendorffii 504  
443347 D8S0L6 PAC:15412996 Selaginella moellendorffii 1285  
1257 D8S3B6 PAC:15405487 Selaginella moellendorffii 535  
268099 D8S343 PAC:15411279 Selaginella moellendorffii 1336  
432509 D8TG81 PAC:15404182 Selaginella moellendorffii 193  
2240 D8TG80 PAC:15408368 Selaginella moellendorffii 539  
138860 D8TG79 PAC:15403638 Selaginella moellendorffii 164  
81558 D8R0A1 PAC:15409051 Selaginella moellendorffii 332  
419183 D8S842 PAC:15407351 Selaginella moellendorffii 510  
444239 D8S844 PAC:15415133 Selaginella moellendorffii 1326  
1294 D8SCH6 PAC:15405580 Selaginella moellendorffii 548  
1345 D8R2R1 PAC:15406252 Selaginella moellendorffii 550  
115290 D8SFA1 PAC:15420672 Selaginella moellendorffii 558  
233866 D8SF84 PAC:15403315 Selaginella moellendorffii 514  

16 Publications

First Author Title Year Journal Volume Pages PubMed ID
            11796116
            10944213
            11397813
            15321719
            10585424
            15723539
            11514662
            10623531
            15576037
            15296736
            9020778
            15148401
            10966817
            10694883
            16600599
            7248267