STUDIES OF PROTEINS IN SOLUTION, INTERFACES AND SOLIDS

多肽链的一般折叠似乎主要受控制 通过内部残留物，即那些不接触溶剂的残留物。包装 在三维拼图的意义上， 被认为在链条的精细调整中起着重要作用 构象包装效应对包装非常敏感 密度，从而影响蛋白质内的空腔分布。的焦点 这方面的工作，在此赠款期间将获得一个 残余物形状的有用措施，并建立“适合”的重要性， 折叠过程。奇怪的是，答案并不明显。 这项工作的第二个重点将是蛋白质的表面， 直接参与生物功能的区域。我们的目的是 尝试开发一种通用的化学标记程序， 在个体水平上，蛋白质的溶剂可及表面 残基在蛋白质折叠过程中， 寡聚化反应或配体结合期间反映了大部分的 分子生物学中正在研究的生物学功能。因为至少50% 通常饱和烃类是最活跃的 化学物质都需要标记它。我们试试亚甲基。 用于识别标记区域的分析技术将是大规模的 谱对标记的 将建立样本。 该程序将在已知结构的蛋白质上进行验证， 核糖核酸酶-S和硫氧还蛋白。该方法将应用于 在几个跨膜螺旋的协会和结构 系统，以及δ-γ分解酶的高阶结构， 与D.M.的实验室合作。T.A. Engelman Steitz和N. 格林德利后面这些问题是X射线或核磁共振无法解决的 程序在这个时候。

The general fold of a polypeptide chain appears to be largely controlled by the interior residues, those that do not contact the solvent. packing of the side chains in the sense of a three dimensional jigsaw puzzle is thought to play a major role in fine adjustmentS of the chain conformation. packing effects are exquisitely sensitive to packing density, and thus to cavity distribution within the protein. The focus of this aspect of the work during this grant period will be to obtain a useful measure of residue shape and establish the importance of "fit" in the folding process. Strangely enough the answer is not obvious. The second focus of the work will be on the surface of the protein, the region immediately involved in biological function. It is our intent to try to develop a general chemical labeling procedure for identifying the solvent accessible surface of a protein at the level of individual residues. The changes in the surface during protein folding, during oligomerization reactions, or during ligand binding reflect most of the biological functions under study in molecular biology. Since at least 50% of this surface is normally saturated hydrocarbons the most reactive chemical species are required to label it at all. We will try methylene. The analytical technique for identifying labeled areas will be mass spectroscopy. The most appropriate technique for sequencing the labeled samples will be established. The procedures will be validated on proteins of known structures starting with ribonuclease-S and thiroedoxin. The method will then be applied to the association and structure of the transmembrane helices in several systems, and to the higher order structures of delta-gamma resolvase in collaboration with the laboratories of D.M. Engelman, T.A. Steitz, and N. Grindley. These latter problems are beyond the reach of X-ray or NMR procedures at this time.