Positive and negative regulation of the cytokinesis contractility controller
Positive and negative regulation of the cytokinesis contractility controller
批准号:
9769504
负责人:
Priyanka Kothari
金额:
$2.74万
依托单位:
依托单位国家:
美国
项目类别:
财政年份:
2018
资助国家:
美国
项目状态:
已结题
起止时间:
2018-07-02 至 2020-02-07
关键词:
ActinsAcuteAffectAffinityBehaviorBindingBiochemicalBiochemical PathwayBiological ProcessBiologyCardiac MyosinsCell ShapeCell divisionCell physiologyCellsChemicalsComplexContractile ProteinsCrosslinkerCytokinesisCytoskeletal ProteinsDataDevelopmentDevelopmental ProcessDictyosteliumDimerizationDiseaseDominant-Negative MutationEmbryonic DevelopmentEnvironmentEnzymesExcisionFeedbackFilamentFluorescenceGeneticGoalsHepatocyteHuman BiologyImageImmunoprecipitationIn VitroInterphaseLightLungMalignant neoplasm of pancreasMass Spectrum AnalysisMeasuresMechanicsMediatingMitotic spindleModelingMolecularMorphogenesisMyoblastsMyosin ATPaseMyosin Type IINeoplasm MetastasisOxidoreductasePost-Translational Protein ProcessingProcessProductionProteinsRegulationResolutionRoleScaffolding ProteinShapesSignal PathwaySignal TransductionSignaling ProteinSiteSpectrum AnalysisStressStructureSystemTestingTissuesWorkbiophysical analysiscancer cellcell motilitycortexillin Icrosslinkdaughter cellgenetic regulatory proteingenetic selectionhuman diseasein vivoinsightloss of functionmechanical behaviormechanical forcemethylmalonatemutantnon-muscle myosinoverexpressionpropionyl-coenzyme Arecruitresponsescaffoldsensorsingle molecule
中文摘要
项目总结:
--
从细胞迁移到胚胎发生,再到组织形态发生,每一个新的生物学过程都依赖于细胞周期。
细胞的能力能够很好地适应不断变化的机械和环境,同时我们还可以理解许多生物化学信号。
涉及的路径,包括那些被整合在一起的机制,以管理一个神经细胞对机械作用力的快速反应。
这仍然是一个谜。破译这些相互作用,将有助于揭示推动这两个问题的新的机械和技术变化。
罗宾逊大学的实验室表示,正常的癌症和疾病与状态有关。据罗宾逊大学的实验室称,这一过程旨在揭示人类细胞如何应对各种不同的疾病力量。
通过对网柄菌细胞质分裂的研究,建立了一个新的模型来塑造和改变过程,即一个细胞分裂成两个细胞。
女儿是细胞。她的实验室还发现,细胞质分裂是由一个由多种细胞组成的综合调控系统驱动的。
蛋白质可以调节它们的行为,以响应它们对机械和生化信号的反应。
我知道许多参与构建细胞动力学和细胞调控系统的参与者,以及他们之间的生化和相互作用,这将允许。
通过大脑皮层神经网络的强制传播仍然是未知的。我的下一个目标是更好地描述监管机构的特征。
这些相互作用的机制将是表征这些相互作用的特征,而这些相互作用将是阐明细胞生长的主要机制的关键。
应对措施取决于其先进的机械设备环境。我们需要找出控制电池机械设备的主要直接设备相互作用机制。
作为回应,我们进行了免疫沉淀,然后对心脏的两个关键节点进行了质谱分析。
细胞动力学调控系统,包括支架蛋白IQGAP2和肌动蛋白交联剂皮质素。
导致了对这些节点中潜在的具有约束力的合作伙伴的首次发现。我们正在使用一种新的荧光和交叉结合的技术。
相关光谱分析(FCCS)和单分子下拉光谱(SiMPull),我们还没有发现一个新的潜力。
IQGAP1是一个负向监管机构,它的抑制机制是通过建立一个负面的监管机构来实现的。我们需要进一步了解IQGAP1是如何实施的。
介导细胞抑制,我将进一步纯化关键的细胞骨架蛋白,并将使用定量和生化检测方法来解决这些问题。
衡量具有约束力的亲和力,并实施一种化学诱导的二聚化反应系统,以评估其抑制作用。
IQGAP1的活动。此外,我还将在间期分裂和胞质分裂期间继续使用超分辨率成像技术。
描述由这些关键的细胞骨架蛋白组成的复合体中的变化,这些蛋白质可能会迫使细胞转导。
通过这个网络。此外,我还将确定丙二酸甲酯和半醛在细胞中的作用。
脱氢酶(Mmsdh),催化丙酰-CoA的主要生产过程。Mmsdh被鉴定为脱氢酶。
可可西林的交互作用,但它也是之前在我们实验室的一项新的遗传基因选择研究中被发现的。但这是不可能的。
蛋白质可能会被丙酰化修饰,这是一种被低估的翻译后修饰,这可能是可能的。
促进细胞动力学调控系统的积极调控。通过遗传、质量和遗传的有机结合来实现。
光谱分析、核磁共振和生物物理分析,我还将进一步阐明Mmsdh的主要细胞功能。
在这里,我们将解密心脏收缩网络的积极作用和消极作用的分子调控机制。
这些信息对于进一步了解细胞的感知能力和对机械推力的反应能力来说,将是至关重要的。
通过对正常和发育过程的深入了解,以及对疾病和状态进展的了解。
英文摘要
PROJECT SUMMARY
Every biological process, ranging from cell migration to embryogenesis and tissue morphogenesis, relies on a
cell’s ability to adapt to changing mechanical environments. While we understand many biochemical signaling
pathways involved, the mechanisms that are integrated to govern a cell’s response to mechanical forces
remain a mystery. Deciphering these interactions will shed light on the mechanical changes that drive both
normal and disease state processes. To reveal how the cell responds to various forces, the Robinson lab
studies Dictyostelium cytokinesis, a model shape change process by which one cell divides to form two
daughter cells. The lab has discovered that cytokinesis is driven by an integrated control system composed of
proteins that modulate their behavior in response to both mechanical and biochemical signals. Although we
know many of the players involved in the cytokinetic control system, their biochemical interactions that allow
force propagation through the cortical network are still unknown. My goal is to characterize the regulatory
mechanisms that characterize these interactions, which will be critical to elucidate the mechanisms of a cell’s
response to its mechanical environment. To identify the direct interactions that govern a cell’s mechanical
response, we performed immunoprecipitation followed by mass spectrometry on two key nodes of the
cytokinetic control system, the scaffolding protein IQGAP2 and the actin crosslinker cortexillin I. This approach
led to the discovery of potential binding partners of these nodes. Using a combination of Fluorescence Cross-
Correlation Spectroscopy (FCCS) and Single Molecule Pulldown (SiMPull), we have discovered a potential
mechanism of inhibition by a negative regulator of the system, IQGAP1. To further understand how IQGAP1
mediates inhibition, I will purify key cytoskeletal proteins and use quantitative biochemical approaches to
measure binding affinities and implement a chemically-inducible dimerization system to assess the inhibitory
activity of IQGAP1. In addition, I will use super-resolution imaging during both interphase and cytokinesis to
characterize alterations in complexes formed by these key cytoskeletal proteins that allow force transduction
through the network. Moreover, I will determine the cellular role of methylmalonate semialdehyde
dehydrogenase (mmsdh), which catalyzes the production of propionyl-coA. Mmsdh was identified as an
interactor of cortexillin I, but was also previously identified in a genetic selection in our lab. It is possible that
proteins may modified by propionylation, an underappreciated post-translational modification, which may
facilitate positive regulation of the cytokinetic control system. Through a combination of genetics, mass
spectrometry, and biophysical analyses, I will elucidate the cellular function of mmsdh. The work proposed
here will decipher the molecular mechanisms of positive and negative regulation of the contractile network.
This information will be critical for understanding the cell’s ability to sense and respond to mechanical forces,
yielding insight into both normal developmental processes, as well as disease state progression.
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Positive and negative regulation of the cytokinesis contractility controller
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批准号:9610830
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项目类别:
-
资助金额:$4.45万
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财政年份:2018
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负责人:Priyanka Kothari
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依托单位:
海外基金