7VU2
Chitoporin from Serratia marcescens
Summary for 7VU2
| Entry DOI | 10.2210/pdb7vu2/pdb |
| Related | 7VTZ |
| Descriptor | Chitoporin, 2-(N-MORPHOLINO)-ETHANESULFONIC ACID, CALCIUM ION, ... (5 entities in total) |
| Functional Keywords | outer membrane protein chitoporin specific porin, membrane protein |
| Biological source | Serratia marcescens |
| Total number of polymer chains | 1 |
| Total formula weight | 55449.05 |
| Authors | Amornloetwattana, R.,Robinson, R.C.,van den Berg, B.,Suginta, W. (deposition date: 2021-11-01, release date: 2022-11-09, Last modification date: 2025-01-29) |
| Primary citation | Amornloetwattana, R.,Robinson, R.C.,Soysa, H.S.M.,van den Berg, B.,Suginta, W. Chitoporin from Serratia marcescens: recombinant expression, purification and crystallization. Acta Crystallogr.,Sect.F, 76:536-543, 2020 Cited by PubMed Abstract: Serratia marcescens is an opportunistic pathogen that commonly causes hospital-acquired infections and can utilize chitin-enriched nutrients as an alternative energy source. This study reports the identification of a chitoporin (ChiP), termed SmChiP, from the outer membrane of S. marcescens. Sequence alignment with genetically characterized ChiPs suggests that SmChiP is more closely related to the monomeric EcChiP from Escherichia coli than to the trimeric VhChiP from Vibrio campbellii. A single crystal of SmChiP grown under the condition 22%(w/v) PEG 8000, 0.1 M calcium acetate, 0.1 M MES pH 6.0 diffracted X-ray synchrotron radiation to 1.85 Å resolution. SmChiP co-crystallized with chitohexaose under the condition 19%(w/v) PEG 1500, 2 M ammonium phosphate monobasic, 0.1 M HEPES pH 7.0 diffracted X-rays to 2.70 Å resolution. Preliminary crystallographic analysis shows that both SmChiP crystal forms contain one molecule per asymmetric unit and that they belong to the tetragonal space groups P422 and P422, respectively. The SmChiP crystal has unit-cell parameters a = 82.97, b = 82.97, c = 189.53 Å, α = β = γ = 90°, while the crystal of SmChiP in complex with chitohexaose has unit-cell parameters a = 73.24, b = 73.24, c = 213.46 Å, α = β = γ = 90°. Initial assessment of the complex structure clearly revealed electron density for the sugar ligand. Structure determination of SmChiP in the absence and presence of chitohexaose should reveal the molecular basis of chitin utilization by S. marcescens. PubMed: 33135672DOI: 10.1107/S2053230X20013874 PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.85 Å) |
Structure validation
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