0000000000215028

AUTHOR

Kada Hammouti

showing 2 related works from this author

News from an Ancient World: Two Novel Astacin Metalloproteases from the Horseshoe Crab

2008

In this work, we report the cloning, heterologous expression, and characterization of two novel astacin proteases from the chelicerate Limulus polyphemus (horseshoe crab), designated as LAST (Limulus astacin) and LAST_MAM (Limulus astacin containing a MAM domain), respectively. The expression pattern showed ubiquitous occurrence of LAST_MAM, while LAST was predominantly restricted to the eyes and brain, indicating a function in the nervous system. Both enzymes contain the characteristic metzincin-type zinc-binding region and Met turn. While LAST is made up only of the typical prodomain and astacin-like protease domain, LAST_MAM contains an additional MAM (meprin A5 protein tyrosine phosphat…

Models MolecularProteasesDNA ComplementaryInsectaProtein familymedicine.medical_treatmentMolecular Sequence DataContext (language use)Protein tyrosine phosphataseBiologyHydroxamic AcidsNervous SystemCollagen Type IGene Expression Regulation EnzymologicCell LineEvolution MolecularStructural BiologyHorseshoe CrabsmedicineAnimalsProtein oligomerizationAmino Acid SequenceRNA MessengerCloning MolecularMolecular BiologyPhylogenyExtracellular Matrix ProteinsProteaseBase SequenceCaseinsMetalloendopeptidasesbiology.organism_classificationProtein Structure TertiaryBiochemistryStructural Homology ProteinLimulusAstacinOligopeptidesProtein Processing Post-TranslationalJournal of Molecular Biology
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Limulus polyphemus Hemocyanin: 10 Å Cryo-EM Structure, Sequence Analysis, Molecular Modelling and Rigid-body Fitting Reveal the Interfaces Between th…

2007

Abstract The blue copper protein hemocyanin from the horseshoe crab Limulus polyphemus is among the largest respiratory proteins found in nature (3.5 MDa) and exhibits a highly cooperative oxygen binding. Its 48 subunits are arranged as eight hexamers (1×6mers) that form the native 8×6mer in a nested hierarchy of 2×6mers and 4×6mers. This quaternary structure is established by eight subunit types (termed I, IIA, II, IIIA, IIIB, IV, V, and VI), of which only type II has been sequenced. Crystal structures of the 1×6mer are available, but for the 8×6mer only a 40 A 3D reconstruction exists. Consequently, the structural parameters of the 8×6mer are not firmly established, and the molecular inte…

Models MolecularMolecular modelCryo-electron microscopyCopper proteinProtein subunitmedicine.medical_treatmentMolecular Sequence DataStructure-Activity RelationshipStructural BiologyHorseshoe CrabsmedicineAnimalsAmino Acid SequenceProtein Structure QuaternaryMolecular BiologyPhylogenySequence Homology Amino AcidbiologyCryoelectron MicroscopyHemocyaninbiology.organism_classificationProtein Structure TertiaryCrystallographyLimulusHemocyaninsProtein quaternary structureOxygen bindingJournal of Molecular Biology
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