The amount of a SUMO-activating enzyme subunit 1 (human) when measured in cerebrospinal fluid. The trait is level of SUMO-activating enzyme subunit 1 (human) in cerebrospinal fluid (OBA_2081937, an Ontology of Biological Attributes term). Also known as: cerebrospinal fluid SUMO-activating enzyme subunit 1 (human) amount.