Septin 9 has Two Polybasic Domains Critical to Septin Filament Assembly and Golgi Integrity

？ Two polybasic domains mediate septin 9 interactions with PIs ？ Human septins have amphipathic helices suitable for membrane binding ？ Septin 9 polybasic domains mediate the formation of septin higher-order structures ？ The mutation or depletion of septin polybasic domains induces Golgi fragmentatio