PROTEOMIC ANALYSIS OF MATURE MELANOSOMES FROM THE RETINAL PIGMENTED EPITHELIUM

该子项目是利用NIH/NCRR资助的中心赠款提供的资源的许多研究子项目之一。子项目和研究者（PI）可能从另一个NIH来源获得了主要资金，因此可以在其他CRISP条目中表示。所列机构为中心，不一定是研究者所在机构。用质谱法分析视网膜色素上皮（RPE）中黑素体的蛋白质含量。超过100种蛋白质被发现是共同的两个样品制备的三个变化。检测到一些通常与其他细胞器相关的蛋白质。检测到几种溶酶体酶，通过免疫电镜证实存在组织蛋白酶D，从而支持先前提出的黑素体可能有助于消化光感受器外节盘降解的观点。

This subproject is one of many research subprojects utilizing the resources provided by a Center grant funded by NIH/NCRR. The subproject and investigator (PI) may have received primary funding from another NIH source, and thus could be represented in other CRISP entries. The institution listed is for the Center, which is not necessarily the institution for the investigator. The protein content of melanosomes in the retinal pigment epithelium (RPE) was analyzed by mass spectrometry. More than 100 proteins were found to be common to two out of three variations of sample preparation. Some proteins normally associated with other organelles were detected. Several lysosomal enzymes were detected, with the presence of cathepsin D confirmed by immunoelectron microscopy, thus supporting the previously suggested notion that melanosomes may contribute to the degradation of ingested photoreceptor outer segment disks.