Table 1. The core subunits of complex I and their associated role in electron or proton transfer as summarised in [11].

Core subunits (bovine nomenclature)	Role
51 kDa	Binding of FMN - N3 - NADH
24 kDa	Binding of N1a
75 kDa	Binding of N1b, N4, N5
PSST	Binding of N2
TYKY	Binding of N6a, N6b
49 kDa-PSST-ND3-ND1	Binding of quinone
ND2, ND4, ND6, ND1-ND6-ND4L	Proton translocation