인코딩된 단백질은 12개의 트랜섬브레인 세그먼트를 포함하는 플라즈마 막의 일체형 단백질이다. 이 단백질의 첫 번째 기능 명칭은 OCTN1("유기농 양이온 수송기, 소설, 유형 1")이었지만, 유기 양이온(예: 테트라에틸아모늄)의 운반 효율은 매우 낮다.[6] 카니틴의 수송 효율도 무시할 만하다. 대신 이 단백질은 나트륨 이온과 항산화제인 에르고티오네인의 세포 내 코트란스포트를 담당한다.[7] 따라서 보다 적절한 기능 명칭은 ETT("ergotionine transport")이다.
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