مشخصات پژوهش

عنوان	Role of the salt bridge between glutamate 546 and arginine 907 inpreservation of autoinhibited form of Apaf-1
نوع پژوهش	مقاله چاپ‌شده در مجلات علمی
کلیدواژه‌ها	Apaf-1, Apoptosome, Caspase-9
چکیده	Apaf-1, the key element of apoptotic mitochondrial pathway, normally exists in an auto-inhibited forminside the cytosol. WRD-domain of Apaf-1 has a critical role in the preservation of auto-inhibited form;however the underlying mechanism is unclear. It seems the salt bridges between WRD and NOD domainsare involved in maintaining the inactive conformation of Apaf-1. At the present study, we have investi-gated the effect of E546-R907 salt bridge on the maintenance of auto-inhibited form of human Apaf-1.E546 is mutated to glutamine (Q) and arginine (R). Over-expression of wild type Apaf-1 and its E546Qand E546R variants in HEK293T cells does not induce apoptosis unlike – HL-60 cancer cell line. In vitroapoptosome formation assay showed that all variants are cytochrome c and dATP dependent to formapoptosome and activate endogenous procaspase-9 in Apaf-1-knockout MEF cell line. These results sug-gest that E546 is not a critical residue for preservation of auto-inhibited Apaf-1. Furthermore, the behaviorof Apaf-1 variants for in vitro apoptosome formation in HEK293T cell is similar to exogenous wild typeApaf-1. Wild type and its variants can form apoptosome in HEK293T cell with different procaspase-3processing pattern in the presence and absence of exogenous cytochrome c and dATP.
پژوهشگران	سوسن کبودانیان اردستانی (نفر ششم به بعد)، آرتور سیزلار پبیودا (نفر ششم به بعد)، مایور ویلاس جین (نفر پنجم)، مهرداد رفعت (نفر ششم به بعد)، مارک لس (نفر سوم)، سامان حسینخانی (نفر دوم)، جمشید داودی (نفر چهارم)، راحله شاکری (نفر اول)