Wheat germ contains an inhibitor for proteinase K, called PK13 (Mr approximately 19,600) which simultaneously inhibits alpha-amylase. PK13 was crystallized, space group P21, a = 43.02 (5) A, b = 65.18 (7) A, c = 32.33 (4) A, beta = 112.79 degrees (9), X-ray data were collected to 2.5 A resolution, the structure solved by molecular replacement on the basis of the atomic coordinates of the homologous Erythrina caffra DE-3 inhibitor, and refined with simulated annealing techniques with a current R-factor of 21%. The three-dimensional structure of PK13 is stabilised by two disulfide bridges and has a central beta-barrel with distorted beta-structure. In analogy to related inhibitors, the binding site for proteinase K is assumed to be located on the surface of the protein (amino acid residues 66-67), although the 75-76 peptide bond is cleaved upon binding.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/0014-5793(91)80158-y | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Reconstruction of Local Three-dimensional Temperature Field of Tumor Cells with Low-toxic Nanoscale Quantum-dot Thermometer and Cepstrum Spatial Localization Algorithm.
Biomed Phys Eng Express
January 2025
Xi'an Jiaotong University, No.28 Xianning West Road, Xi'an, Shaanxi 710049, P.R. China, Xi'an, 710049, CHINA.
The optimal method for three-dimensional thermal imaging within cells involves collecting intracellular temperature responses while simultaneously obtaining corresponding 3D positional information. Current temperature measurement techniques based on the photothermal properties of quantum dots face several limitations, including high cytotoxicity and low fluorescence quantum yields. These issues affect the normal metabolic processes of tumor cells.
View Article and Find Full Text PDFEvaluation of Synthetic Peptides from ATP Diphosphohydrolase 1: In Silico Approaches for Characterization and Prospective Application in Diagnosis of Schistosomiasis.
ACS Infect Dis
January 2025
Department of Biochemistry, Institute of Biological Sciences, Federal University of Juiz de Fora, Juiz de Fora, Minas Gerais 36036-900, Brazil.
Schistosomiasis is the infection caused by and constitutes a worldwide public health problem. The parasitological recommended method and serological methods can be used for the detection of eggs and antibodies, respectively. However, both have limitations, especially in low endemicity areas.
View Article and Find Full Text PDFKinetics of vapor-liquid and vapor-solid phase separation under gravity.
Soft Matter
January 2025
Department of Physics, School of Advanced Sciences, Vellore Institute of Technology, Vellore, Tamil Nadu 632014, India.
We study the kinetics of vapor-liquid and vapor-solid phase separation of a hydrodynamics preserving three-dimensional one-component Lennard Jones system in the presence of an external gravitational field using extensive molecular dynamic simulation. A bicontinuous domain structure is formed when the homogeneous system near the critical density is quenched inside the coexistence region. In the absence of gravity, the domain morphology is statistically self-similar and the length scale grows as per the existing laws.
View Article and Find Full Text PDFSpin-Frustrated Metal-Organic Frameworks.
Chemistry
January 2025
Indian Institute of Science Education and Research (IISER), Chemistry, Dr. Homi Bhabha Road, Pashan, 411008, Pune, INDIA.
Metal-organic frameworks (MOFs) are a fascinating class of structured materials with diverse functionality originating from the distinctive physicochemical properties. This review focuses on the specific chemical design of geometrically frustrated MOFs along with the origin of the intriguing magnetic properties. We have discussed the arrangement of spin centres (metal and ligand) which are responsible for the unusual magnetic phenomena in MOFs.
View Article and Find Full Text PDFTransient chaos and periodic structures in a model of neuronal early afterdepolarization.
Chaos
January 2025
Departamento de Física, Universidade Federal de Santa Catarina, Florianópolis 88040-900, Santa Catarina, Brazil.
The presence of chaos is ubiquitous in mathematical models of neuroscience. In experimental neural systems, chaos was convincingly demonstrated in membranes, neurons, and small networks. However, its effects on the brain have long been debated.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!