Function
Catalyzes the conversion of the important environmental pollutant gamma-hexachlorocyclohexane (gamma-HCH or lindane) to 1,3,4,6-tetrachloro-1,4-cyclohexadiene (1,4-TCDN) via gamma-pentachlorocyclohexene (gamma-PCCH) (PubMed:12450824). Proceeds by two successive 1,2-anti conformationally dependent dehydrochlorinations (By similarity). Also shows activity with alpha- and delta-HCH, giving alpha- and delta-PCCH respectively, but not with the beta isomer (PubMed:12450824).