결정광조사와 효소 활성: 대기 가스의 숨은 역할

초록

1968년 코모라소나가 보고한 ‘결정광조사 효과’는 효소 기질을 결정 상태에서 특정 시간만큼 빛에 노출하면 물에 녹였을 때 반응 속도가 최대 30%까지 증가한다는 현상이다. 본 연구는 LDH‑피루브산 반응을 대상으로, 기질이 아닌 다른 결정(예: NaCl, KCl, 실리카)도 동일한 시간‑주기 패턴으로 효소 활성화를 일으킨다는 실험 결과를 제시한다. 저자는 광조사가 결정 표면에 흡착된 대기 가스(산소·질소·수증기 등)의 진동성 광화학 반응을 촉진하고, 그 생성물 혹은 후속 ‘다크’ 반응 생성물이 효소 보조인자 역할을 한다는 가설을 제시한다.

상세 분석

코모라소나 현상은 1960년대 이후 여러 실험실에서 재현이 어려워 논란이 되었지만, 본 논문은 그 재현성을 강화하는 새로운 실험 설계를 제시한다. 첫째, 저자는 LDH와 피루브산 반응계에 NaCl·KCl·SiO₂ 등 전혀 화학적으로 관련 없는 결정들을 사용했음에도 동일한 ‘시간‑주기’ 패턴(τ≈5 s, 10 s, 15 s 등)으로 효소 활성이 증강되는 것을 확인했다. 이는 기존 가설인 ‘기질 자체의 구조 변형’보다는 외부 요인의 개입 가능성을 시사한다.

둘째, 광조사 파장은 254 nm 자외선(UV‑C)으로, 이는 대기 중 물분자와 산소·질소의 광해리·광이온화 에너지와 일치한다. 저자는 결정 표면에 흡착된 미세한 대기 가스층이 UV‑C에 의해 전자·라디칼을 생성하고, 이들이 결정 표면에서 주기적인 진동 반응(예: 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