smart00886, Dabb, Stress responsive A/B Barrel Domain. The function of this domain is unknown, but it is upregulated in response to salt stress in Populus balsamifera (balsam poplar). It is also found at the C-terminus of a fructose 1,6-bisphosphate aldolase from Hydrogenophilus thermoluteolus.It is found in the pA01 plasmid, which encodes genes for molybdopterin uptake and degradation of plant alkaloid nicotine. The structure of one has been solved and the domain forms an alpha-beta barrel dimer. Although there is a clear duplication within the domain it is not obviously detectable in the sequence.
9.07233e-13
CP035544.1|QBA63252.1|223840_225229_-|dipeptidase
gnl|CDD|349929
cd05680, M20_dipept_like, uncharacterized M20 dipeptidase. Peptidase M20 family, unknown dipeptidase-like subfamily (inferred by homology to be dipeptidases). M20 dipeptidases include a large variety of bacterial enzymes including cytosolic nonspecific dipeptidase (CNDP), Xaa-methyl-His dipeptidase (anserinase),and canosinase. These dipeptidases have been shown to act on a wide range of dipeptides, but not larger peptides. For example, anserinase mainly catalyzes the hydrolysis of N-alpha-acetylhistidine while carnosinase degrades beta-alanyl-L-histidine.
cd00616, AHBA_syn, 3-amino-5-hydroxybenzoic acid synthase family (AHBA_syn). AHBA_syn family belongs to pyridoxal phosphate (PLP)-dependent aspartate aminotransferase superfamily (fold I). The members of this CD are involved in various biosynthetic pathways for secondary metabolites. Some well studied proteins in this CD are AHBA_synthase, protein product of pleiotropic regulatory gene degT, Arnb aminotransferase and pilin glycosylation protein. The prototype of this family, the AHBA_synthase, is a dimeric PLP dependent enzyme. AHBA_syn is the terminal enzyme of 3-amino-5-hydroxybenzoic acid (AHBA) formation which is involved in the biosynthesis of ansamycin antibiotics, including rifamycin B. Some members of this CD are involved in 4-amino-6-deoxy-monosaccharide D-perosamine synthesis. Perosamine is an important element in the glycosylation of several cell products, such as antibiotics and lipopolysaccharides of gram-positive and gram-negative bacteria. The pilin glycosylation protein encoded by gene pglA, is a galactosyltransferase involved in pilin glycosylation. Additionally, this CD consists of ArnB (PmrH) aminotransferase, a 4-amino-4-deoxy-L-arabinose lipopolysaccharide-modifying enzyme. This CD also consists of several predicted pyridoxal phosphate-dependent enzymes apparently involved in regulation of cell wall biogenesis. The catalytic lysine which is present in all characterized PLP dependent enzymes is replaced by histidine in some members of this CD.
pfam14362, DUF4407, Domain of unknown function (DUF4407). This family of proteins is found in bacteria. Proteins in this family are typically between 366 and 597 amino acids in length. There is a single completely conserved residue R that may be functionally important.
pfam01551, Peptidase_M23, Peptidase family M23. Members of this family are zinc metallopeptidases with a range of specificities. The peptidase family M23 is included in this family, these are Gly-Gly endopeptidases. Peptidase family M23 are also endopeptidases. This family also includes some bacterial lipoproteins for which no proteolytic activity has been demonstrated. This family also includes leukocyte cell-derived chemotaxin 2 (LECT2) proteins. LECT2 is a liver-specific protein which is thought to be linked to hepatocyte growth although the exact function of this protein is unknown.
cd17359, MFS_XylE_like, D-xylose-proton symporter and similar transporters of the Major Facilitator Superfamily. This subfamily includes bacterial transporters such as D-xylose-proton symporter (XylE or XylT), arabinose-proton symporter (AraE), galactose-proton symporter (GalP), major myo-inositol transporter IolT, glucose transport protein, putative metabolite transport proteins YfiG, YncC, and YwtG, and similar proteins. The symporters XylE, AraE, and GalP facilitate the uptake of D-xylose, arabinose, and galactose, respectively, across the boundary membrane with the concomitant transport of protons into the cell. IolT is involved in polyol metabolism and myo-inositol degradation into acetyl-CoA. The XylE-like subfamily belongs to the Glucose transporter -like (GLUT-like) family of the Major Facilitator Superfamily (MFS) of membrane transport proteins. MFS proteins are thought to function through a single substrate binding site, alternating-access mechanism involving a rocker-switch type of movement.
pfam12412, DUF3667, Protein of unknown function (DUF3667). This domain family is found in bacteria and eukaryotes, and is approximately 50 amino acids in length. There is a single completely conserved residue P that may be functionally important.
pfam04199, Cyclase, Putative cyclase. Proteins in this family are thought to be cyclase enzymes. They are found in proteins involved in antibiotic synthesis. However they are also found in organisms that do not make antibiotics pointing to a wider role for these proteins. The proteins contain a conserved motif HXGTHXDXPXH that is likely to form part of the active site.
cd05247, UDP_G4E_1_SDR_e, UDP-glucose 4 epimerase, subgroup 1, extended (e) SDRs. UDP-glucose 4 epimerase (aka UDP-galactose-4-epimerase), is a homodimeric extended SDR. It catalyzes the NAD-dependent conversion of UDP-galactose to UDP-glucose, the final step in Leloir galactose synthesis. This subgroup has the characteristic active site tetrad and NAD-binding motif of the extended SDRs. Extended SDRs are distinct from classical SDRs. In addition to the Rossmann fold (alpha/beta folding pattern with a central beta-sheet) core region typical of all SDRs, extended SDRs have a less conserved C-terminal extension of approximately 100 amino acids. Extended SDRs are a diverse collection of proteins, and include isomerases, epimerases, oxidoreductases, and lyases; they typically have a TGXXGXXG cofactor binding motif. SDRs are a functionally diverse family of oxidoreductases that have a single domain with a structurally conserved Rossmann fold, an NAD(P)(H)-binding region, and a structurally diverse C-terminal region. Sequence identity between different SDR enzymes is typically in the 15-30% range; they catalyze a wide range of activities including the metabolism of steroids, cofactors, carbohydrates, lipids, aromatic compounds, and amino acids, and act in redox sensing. Classical SDRs have an TGXXX[AG]XG cofactor binding motif and a YXXXK active site motif, with the Tyr residue of the active site motif serving as a critical catalytic residue (Tyr-151, human 15-hydroxyprostaglandin dehydrogenase numbering). In addition to the Tyr and Lys, there is often an upstream Ser and/or an Asn, contributing to the active site; while substrate binding is in the C-terminal region, which determines specificity. The standard reaction mechanism is a 4-pro-S hydride transfer and proton relay involving the conserved Tyr and Lys, a water molecule stabilized by Asn, and nicotinamide. Atypical SDRs generally lack the catalytic residues characteristic of the SDRs, and their glycine-rich NAD(P)-binding motif is often different from the forms normally seen in classical or extended SDRs. Complex (multidomain) SDRs such as ketoreductase domains of fatty acid synthase have a GGXGXXG NAD(P)-binding motif and an altered active site motif (YXXXN). Fungal type ketoacyl reductases have a TGXXXGX(1-2)G NAD(P)-binding motif.
pfam14014, DUF4230, Protein of unknown function (DUF4230). This family of proteins is functionally uncharacterized. This family of proteins is found in bacteria. Proteins in this family are typically between 203 and 228 amino acids in length.
cd01193, INT_IntI_C, Integron integrase and similar protiens, C-terminal catalytic domain. Integron integrases mediate site-specific DNA recombination between a proximal primary site (attI) and a secondary target site (attC) found within mobile gene cassettes encoding resistance or virulence factors. Unlike other site specific recombinases, the attC sites lack sequence conservation. Integron integrase exhibits broader DNA specificity by recognizing the non-conserved attC sites. The structure shows that DNA target site recognition are not dependent on canonical DNA but on the position of two flipped-out bases that interact in cis and in trans with the integrase. Integron-integrases are present in many natural occurring mobile elements, including transposons and conjugative plasmids. Vibrio, Shewanella, Xanthomonas, and Pseudomonas species harbor chromosomal super-integrons. All integron-integrases carry large inserts unlike the TnpF ermF-like proteins also seen in this group.
cd00408, DHDPS-like, Dihydrodipicolinate synthase family. Dihydrodipicolinate synthase family. A member of the class I aldolases, which use an active-site lysine which stabilizes a reaction intermediate via Schiff base formation, and have TIM beta/alpha barrel fold. The dihydrodipicolinate synthase family comprises several pyruvate-dependent class I aldolases that use the same catalytic step to catalyze different reactions in different pathways and includes such proteins as N-acetylneuraminate lyase, MosA protein, 5-keto-4-deoxy-glucarate dehydratase, trans-o-hydroxybenzylidenepyruvate hydratase-aldolase, trans-2'-carboxybenzalpyruvate hydratase-aldolase, and 2-keto-3-deoxy- gluconate aldolase. The family is also referred to as the N-acetylneuraminate lyase (NAL) family.
cd07129, ALDH_KGSADH, Alpha-Ketoglutaric Semialdehyde Dehydrogenase. Alpha-Ketoglutaric Semialdehyde (KGSA) Dehydrogenase (KGSADH, EC 1.2.1.26) catalyzes the NAD(P)+-dependent conversion of KGSA to alpha-ketoglutarate. This CD contains such sequences as those seen in Azospirillum brasilense, KGSADH-II (D-glucarate/D-galactarate-inducible) and KGSADH-III (hydroxy-L-proline-inducible). Both show similar high substrate specificity for KGSA and different coenzyme specificity; KGSADH-II is NAD+-dependent and KGSADH-III is NADP+-dependent. Also included in this CD is the NADP(+)-dependent aldehyde dehydrogenase from Vibrio harveyi which catalyzes the oxidation of long-chain aliphatic aldehydes to acids.
cd05660, M28_like_PA, M28 Zn-peptidase containing a protease-associated (PA) domain insert. Peptidase family M28 (also called aminopeptidase Y family), uncharacterized subfamily. The M28 family contains aminopeptidases as well as carboxypeptidases. They have co-catalytic zinc ions; each zinc ion is tetrahedrally co-ordinated, with three amino acid ligands plus activated water; one aspartate residue binds both metal ions. This subfamily is composed of uncharacterized proteins containing a protease-associated (PA) domain insert which may participate in substrate binding and/or promote conformational changes, influencing the stability and accessibility of the site to substrate.
cd03145, GAT1_cyanophycinase, Type 1 glutamine amidotransferase (GATase1)-like domain found in cyanophycinase. Type 1 glutamine amidotransferase (GATase1)-like domain found in cyanophycinase. This group contains proteins similar to the extracellular cyanophycinases from Pseudomonas anguilliseptica BI (CphE) and Synechocystis sp. PCC 6803 CphB. Cyanophycinases are intracellular exopeptidases which hydrolyze the polymer cyanophycin (multi L-arginyl-poly-L-aspartic acid) to the dipeptide beta-Asp-Arg. Cyanophycinase is believed to be a serine-type exopeptidase having a Ser-His-Glu catalytic triad which differs from the Cys-His-Glu catalytic triad typical of GATase1 domains by having a Ser in place of the reactive Cys at the nucleophile elbow.
pfam02666, PS_Dcarbxylase, Phosphatidylserine decarboxylase. This is a family of phosphatidylserine decarboxylases, EC:4.1.1.65. These enzymes catalyze the reaction: Phosphatidyl-L-serine <=> phosphatidylethanolamine + CO2. Phosphatidylserine decarboxylase plays a central role in the biosynthesis of aminophospholipids by converting phosphatidylserine to phosphatidylethanolamine.
TIGR04001, thiol_BshB1, bacillithiol biosynthesis deacetylase BshB1. Members of this protein family are BshB1 (YpjG), an enzyme of bacillithiol biosynthesis; either BshB1 or BshB2 (YojG) must be present, and often both are present. Bacillithiol is a low-molecular-weight thiol, an analog of glutathione and mycothiol, and is found largely in the Firmicutes. [Biosynthesis of cofactors, prosthetic groups, and carriers, Glutathione and analogs].
pfam07676, PD40, WD40-like Beta Propeller Repeat. This family appears to be related to the pfam00400 repeat This This repeat corresponds to the RIVW repeat identified in cell surface proteins [Adindla et al. Comparative and Functional Genomics 2004; 5:2-16].
cd01347, ligand_gated_channel, TonB dependent/Ligand-Gated channels are created by a monomeric 22 strand (22,24) anti-parallel beta-barrel. Ligands apparently bind to the large extracellular loops. The N-terminal 150-200 residues form a plug from the periplasmic end of barrel. Energy (proton-motive force) and TonB-dependent conformational alteration of channel (parts of plug, and loops 7 and 8) allow passage of ligand. FepA residues 12-18 form the TonB box, which mediates the interaction with the TonB-containing inner membrane complex. TonB preferentially interacts with ligand-bound receptors. Transport thru the channel may resemble passage thru an air lock. In this model, ligand binding leads to closure of the extracellular end of pore, then a TonB-mediated signal facillitates opening of the interior side of pore, deforming the N-terminal plug and allowing passage of the ligand to the periplasm. Such a mechanism would prevent the free diffusion of small molecules thru the pore.
The bacterium proteins that are colored denote the protein is present at specific phage-related keywords (such as 'capsid', 'head', 'integrase', 'plate', 'tail', 'fiber', 'coat', 'transposase', 'portal', 'terminase', 'protease' or 'lysin' and 'tRNA')
