| Analysis | rpsblast_cdd | Start | 45 |
| End | 347 | Strand | + |
| Length | 303 | Note | Gaps:15 |
| Hit Coverage | 100.00 | Hit Length | 308 |
| Hit Pident | 46.75 | E Val | 1e-108 |
| Hit Description | cd08948 5beta-POR_like_SDR_a progesterone 5-beta-reductase-like proteins (5beta-POR) atypical (a) SDRs. 5beta-POR catalyzes the reduction of progesterone to 5beta-pregnane-3 20-dione in Digitalis plants. This subgroup of atypical-extended SDRs shares the structure of an extended SDR but has a different glycine-rich nucleotide binding motif (GXXGXXG) and lacks the YXXXK active site motif of classical and extended SDRs. Tyr-179 and Lys 147 are present in the active site but not in the usual SDR configuration. Given these differences it has been proposed that this subfamily represents a new SDR class. Other atypical SDRs include biliverdin IX beta reductase (BVR-B aka flavin reductase) NMRa (a negative transcriptional regulator of various fungi) phenylcoumaran benzylic ether and pinoresinol-lariciresinol reductases phenylpropene synthases eugenol synthase triphenylmethane reductase isoflavone reductases and others. 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. In addition to the Rossmann fold core region typical of all SDRs extended SDRs have a less conserved C-terminal extension of approximately 100 amino acids and typically have a TGXXGXXG cofactor binding motif. 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. | Hit Pcons | 12.34 |
| Name | Qrob_P0531870.2 |
| Protein Identifier |
Organism . Name |
Score | Score Type | Protein Description | Alias (in v1) | Code Enzyme | Gene Prediction Quality |
|---|---|---|---|---|---|---|---|
| Qrob_P0531870.2 | Quercus robur | 93.5 | egn | (M=1) 1.3.99.6 - 3-oxo-5-beta-steroid 4-dehydrogenase. | EC:1.3.99.6, EC:1.3.1.3 | validated |
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