TIGR00644, recJ, single-stranded-DNA-specific exonuclease RecJ. All proteins in this family are 5'-3' single-strand DNA exonucleases. These proteins are used in some aspects of mismatch repair, recombination, and recombinational repair. [DNA metabolism, DNA replication, recombination, and repair].
TIGR00661, conserved_hypothetical_protein, conserved hypothetical protein. This model represents nearly the full length of MJ1255 from Methanococcus jannaschii and of an unpublished protein from Vibrio cholerae, as well as the C-terminal half of a protein from Methanobacterium thermoautotrophicum. A small region (~50 amino acids) within the domain appears related to a family of sugar transferases. [Hypothetical proteins, Conserved].
cd07398, MPP_YbbF-LpxH, Escherichia coli YbbF/LpxH and related proteins, metallophosphatase domain. YbbF/LpxH is an Escherichia coli UDP-2,3-diacylglucosamine hydrolase thought to catalyze the fourth step of lipid A biosynthesis, in which a precursor UDP-2,3-diacylglucosamine is hydrolyzed to yield 2,3-diacylglucosamine 1-phosphate and UMP. YbbF belongs to the metallophosphatase (MPP) superfamily. MPPs are functionally diverse, but all share a conserved domain with an active site consisting of two metal ions (usually manganese, iron, or zinc) coordinated with octahedral geometry by a cage of histidine, aspartate, and asparagine residues. The MPP superfamily includes: Mre11/SbcD-like exonucleases, Dbr1-like RNA lariat debranching enzymes, YfcE-like phosphodiesterases, purple acid phosphatases (PAPs), YbbF-like UDP-2,3-diacylglucosamine hydrolases, and acid sphingomyelinases (ASMases). The conserved domain is a double beta-sheet sandwich with a di-metal active site made up of residues located at the C-terminal side of the sheets. This domain is thought to allow for productive metal coordination.
pfam06271, RDD, RDD family. This family of proteins contain three highly conserved amino acids: one arginine and two aspartates, hence the name of RDD family. This region contains two predicted transmembrane regions. The arginine occurs at the N-terminus of the first helix and the first aspartate occurs in the middle of this helix. The molecular function of this region is unknown. However this region may be involved in transport of an as yet unknown set of ligands (Bateman A pers. obs.).
pfam01944, SpoIIM, Stage II sporulation protein M. SpoIIM is on e of four stage II sporulation proteins that is necessary for the forespore inside the mother-cell to be properly internalized through the breakdown of peptidoglycans trapped between the membranes of the septum separating the forespore and the mother-cell. The four proteins working in sequence are SpoIIB, pfam05036, SpoIIM, SpoIIP, pfam07454, and finally SpoIID, pfam08486. D, M and P are in a complex with each other and the complex assembles in a hierarchical manner such that M, which serves as a membrane anchor, recruits P to the septum and P, in turn, recruits D to the septum.
pfam12823, DUF3817, Domain of unknown function (DUF3817). This domain is of unknown function. It is sometimes found adjacent to pfam07690 and pfam03176 which are both transporter domains.
pfam14905, OMP_b-brl_3, Outer membrane protein beta-barrel family. This family includes proteins annotated as TonB dependent receptors. But it is also likely to contain other membrane beta barrel proteins of other functions.
pfam14542, Acetyltransf_CG, GCN5-related N-acetyl-transferase. This family of GCN5-related N-acetyl-transferases bind both CoA and acetyl-CoA. They are characterized by highly conserved glycine, a cysteine residue in the acetyl-CoA binding site near the acetyl group, their small size compared with other GNATs and a lack of of an obvious substrate-binding site. It is proposed that they transfer an acetyl group from acetyl-CoA to one or more unidentified aliphatic amines via an acetyl (cysteine) enzyme intermediate. The substrate might be another macromolecule.
cd07334, M48C_loiP_like, Peptidase M48C Ste24p loiP-like, integral membrane protein. This subfamily contains peptidase M48 Ste24p protease loiP (formerly yggG)-like family are mostly uncharacterized proteins that include E. coli loiP and ycaLG, considered to be putative metallopeptidases, containing a zinc-binding motif, HEXXH, and a COOH-terminal ER retrieval signal (KKXX). They proteolytically remove the C-terminal three residues of farnesylated proteins. They are integral membrane proteins associated with the endoplasmic reticulum and golgi, binding one zinc ion per subunit. In eukaryotes, Ste24p is required for the first NH2-terminal proteolytic processing event within the a-factor precursor, which takes place after COOH-terminal CAAX modification (C is cysteine; A is usually aliphatic; X is one of several amino acids) is complete. Mutation studies have shown that the HEXXH protease motif, which is extracellular but adjacent to a transmembrane domain and therefore close to the membrane surface, is critical for Ste24p activity. LoiP has been shown to be a metallopeptidase that cleaves its targets preferentially between Phe-Phe residues. It is upregulated when bacteria are subjected to media of low osmolarity, thus yggG was named LoiP (low osmolarity induced protease). Proper membrane localization of LoiP may depend on YfgC, another putative metalloprotease in this subfamily.
pfam13559, DUF4129, Domain of unknown function (DUF4129). This presumed domain is found at the C-terminus of proteins that contain a transglutaminase core domain. The function of this domain is unknown. The domain has a conserved TXXE motif.
pfam14905, OMP_b-brl_3, Outer membrane protein beta-barrel family. This family includes proteins annotated as TonB dependent receptors. But it is also likely to contain other membrane beta barrel proteins of other functions.
cd08982, GH43-like, Glycosyl hydrolase family 43 protein; uncharacterized. This glycosyl hydrolase family 43 (GH43)-like subfamily includes uncharacterized enzymes similar to those with beta-1,4-xylosidase (xylan 1,4-beta-xylosidase; EC 3.2.1.37), beta-1,3-xylosidase (EC 3.2.1.-), alpha-L-arabinofuranosidase (EC 3.2.1.55), arabinanase (EC 3.2.1.99), xylanase (EC 3.2.1.8), endo-alpha-L-arabinanase and galactan 1,3-beta-galactosidase (EC 3.2.1.145) activities. These are inverting enzymes (i.e. they invert the stereochemistry of the anomeric carbon atom of the substrate) that have an aspartate as the catalytic general base, a glutamate as the catalytic general acid and another aspartate that is responsible for pKa modulation and orienting the catalytic acid. Many of the enzymes in this family display both alpha-L-arabinofuranosidase and beta-D-xylosidase activity using aryl-glycosides as substrates. A common structural feature of GH43 enzymes is a 5-bladed beta-propeller domain that contains the catalytic acid and catalytic base. A long V-shaped groove, partially enclosed at one end, forms a single extended substrate-binding surface across the face of the propeller.
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')
