759 research outputs found

    Facio ut facias

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    This exploratory study takes a look at the puzzle of what type of contracts are suitable for governing innovation, with particular atte ntion to inter-firm networks. It employs a conceptual framework that integrates organizational theory of formal coordination with economic perspectives on contracting, and innovate previous analyses in two ways: developing an assessment of alternative contractual forms in terms of knowledge governance and not only in terms of conflict resolution; analyzing contracts according to the intensity at which they incorporate not only market-like mechanisms, but also hierarchical and bureaucratic mechanisms, and a usually neglected array of associational and democratic mechanisms, as related to the level of uncertainty and innovation. A new type of 'associational' and 'constitutional' contract, resource based rather than action-based, is singled out as particularly fit to the governance of innovation. The framework is empirically applied to content analyze the written agreements regulating inter firm alliances for innovation in a comparative case study approach

    The bearable lightness of inter-firm strategic alliances: resource-based and procedural contracting

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    This paper inquires into how contracts can regulate the complex and uncertain matters on which strategic alliances get formed. It highlights that contracts can be 'light' without being mistakenly incomplete. It is argued that the contracts constituting and regulating strategic alliances are composed by an associational core, focused on resource commitments and on the specification of property rights, broadly intended; and of a belt of contractual clauses incorporating a variety of coordination mechanisms (including, and actually privileging, joint decision making procedures). The interpretive power of the framework is illustrated through the analys is of three alliance contracts

    c-Myc Accelerates S-Phase and Requires WRN to Avoid Replication Stress

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    c-Myc interacts with components of the pre-replication complex and directly regulates DNA replication [1]. However the consequences of this novel c-Myc function on cell cycle dynamics and replication-associated damage are unknown. Here, we show that c-Myc overexpression in primary human fibroblasts markedly accelerates S-phase while c-Myc deficient fibroblasts exhibit a prolonged S-phase. We also show that the Werner DNA helicase protein (WRN) plays a critical role in supporting c-Myc-driven S-phase, as depletion of WRN in c-Myc overexpressing cells increases DNA damage specifically at sites of DNA synthesis. This excess DNA damage activates a “replication stress” pathway involving ATR, CHK1, CHK2, and p53, leading to rapid senescence of WRN deficient c-Myc overexpressing cells. Indeed, depletion of p53 rescues this senescence response. We propose that WRN functions to repair abnormal replication structures caused by the acceleration of DNA replication by c-Myc. This work provides an additional mechanistic explanation for c-Myc-induced DNA damage and senescence, and reveals a vulnerability of c-Myc overexpressing cells that could potentially be exploited in cancer therapy

    Depicting conformational ensembles of \u3b1-synuclein by single molecule force spectroscopy and native mass spectroscopy

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    Description of heterogeneous molecular ensembles, such as intrinsically disordered proteins, represents a challenge in structural biology and an urgent question posed by biochemistry to interpret many physiologically important, regulatory mechanisms. Single-molecule techniques can provide a unique contribution to this field. This work applies single molecule force spectroscopy to probe conformational properties of \u3b1-synuclein in solution and its conformational changes induced by ligand binding. The goal is to compare data from such an approach with those obtained by native mass spectrometry. These two orthogonal, biophysical methods are found to deliver a complex picture, in which monomeric \u3b1-synuclein in solution spontaneously populates compact and partially compacted states, which are differently stabilized by binding to aggregation inhibitors, such as dopamine and epigallocatechin-3-gallate. Analyses by circular dichroism and Fourier-transform infrared spectroscopy show that these transitions do not involve formation of secondary structure. This comparative analysis provides support to structural interpretation of charge-state distributions obtained by native mass spectrometry and helps, in turn, defining the conformational components detected by single molecule force spectroscopy

    Embelin binds to human neuroserpin and impairs its polymerisation

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    Neuroserpin (NS) is a serpin inhibitor of tissue plasminogen activator (tPA) in the brain. The polymerisation of NS pathologic mutants is responsible for a genetic dementia known as familial encephalopathy with neuroserpin inclusion bodies (FENIB). So far, a pharmacological treatment of FENIB, i.e. an inhibitor of NS polymerisation, remains an unmet challenge. Here, we present a biophysical characterisation of the effects caused by embelin (EMB a small natural compound) on NS conformers and NS polymerisation. EMB destabilises all known NS conformers, specifically binding to NS molecules with a 1:1 NS:EMB molar ratio without unfolding the NS fold. In particular, NS polymers disaggregate in the presence of EMB, and their formation is prevented. The NS/EMB complex does not inhibit tPA proteolytic activity. Both effects are pharmacologically relevant: firstly by inhibiting the NS polymerisation associated to FENIB, and secondly by potentially antagonizing metastatic processes facilitated by NS activity in the brain
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