4.   c.127.1       F420-dependent methylenetetrahydromethanopterin dehydrogenase (MTD)  the sheet topology is similar to those of the Periplasmic binding protein-like I domains !   
                   F420-dependent methylenetetrahydromethanopterin dehydrogenase (MTD) 3 layers: a/b/a; parallel beta-sheet of 6 strands, order 213456
                   1u6j  d1u6ji1  I:14-26,114-120,152-171,179-184,184-192
                   1u6j  d1u6jc1  C:14-26,114-120,152-171,179-184,184-192
                   1u6i  d1u6ii1  I:14-26,114-120,152-171,179-184,184-192
                   1u6i  d1u6ic1  C:14-26,114-120,152-171,179-184,184-192
                   1u6i  d1u6il1  L:14-26,114-120,152-171,180-184,184-192
                   1u6i  d1u6if1  F:14-26,114-120,152-171,180-184,184-192
                   1u6j  d1u6jf1  F:14-26,114-120,152-171,180-184,184-192
                   1u6j  d1u6jl1  L:14-26,114-120,152-171,180-184,184-192
                   1u6i  d1u6ij1  J:14-26,114-120,152-171,180-184,184-192
                   1u6i  d1u6id1  D:14-26,114-120,152-171,180-184,184-192
                   1u6j  d1u6jd1  D:14-26,114-120,152-171,180-184,184-192
                   1u6j  d1u6jj1  J:14-26,114-120,152-171,180-184,184-192
                   1qv9  d1qv9b_  B:14-26,114-120,152-171,180-184,184-192
                   1u6k  d1u6kb1  B:14-26,114-120,152-171,180-184,184-192
                   1qv9  d1qv9c_  C:14-26,114-120,152-171,180-184,184-192
                   1u6k  d1u6kc1  C:14-26,114-120,152-171,180-184,184-192