3HKX
Crystal structure analysis of an amidase from Nesterenkonia sp.
Summary for 3HKX
| Entry DOI | 10.2210/pdb3hkx/pdb |
| Descriptor | Amidase (2 entities in total) |
| Functional Keywords | alpha-beta-beta-alpha:alpha-beta-beta-alpha dimeric sandwich, hydrolase |
| Biological source | Nesterenkonia sp. 10004 |
| Total number of polymer chains | 1 |
| Total formula weight | 30116.79 |
| Authors | Sewell, B.T.,Nel, A.J.M.,Cowan, D.A. (deposition date: 2009-05-26, release date: 2009-06-09, Last modification date: 2023-09-06) |
| Primary citation | Nel, A.J.,Tuffin, I.M.,Sewell, B.T.,Cowan, D.A. Unique aliphatic amidase from a psychrotrophic and haloalkaliphilic nesterenkonia isolate. Appl.Environ.Microbiol., 77:3696-3702, 2011 Cited by PubMed Abstract: Nesterenkonia strain AN1 was isolated from a screening program for nitrile- and amide-hydrolyzing microorganisms in Antarctic desert soil samples. Strain AN1 showed significant 16S rRNA sequence identity to known members of the genus. Like known Nesterenkonia species, strain AN1 was obligately alkaliphilic (optimum environmental pH, 9 to 10) and halotolerant (optimum environmental Na(+) content, 0 to 15% [wt/vol]) but was also shown to be an obligate psychrophile with optimum growth at approximately 21°C. The partially sequenced genome of AN1 revealed an open reading frame (ORF) encoding a putative protein member of the nitrilase superfamily, referred to as NitN (264 amino acids). The protein crystallized readily as a dimer and the atomic structure of all but 10 amino acids of the protein was determined, confirming that the enzyme had an active site and a fold characteristic of the nitrilase superfamily. The protein was screened for activity against a variety of nitrile, carbamoyl, and amide substrates and was found to have only amidase activity. It had highest affinity for propionamide but demonstrated a low catalytic rate. NitN had maximal activity at 30°C and between pH 6.5 and 7.5, conditions which are outside the optimum growth range for the organism. PubMed: 21498772DOI: 10.1128/AEM.02726-10 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.66 Å) |
Structure validation
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