TY  - JOUR
N1  - Copyright of this article belongs to John Wiley & Sons.
ID  - open2159
UR  - https://doi.org/10.1111/febs.14619
IS  - 18
A1  - Solanki, Vipul
A1  - Kapoor, Srajan
A1  - Thakur, Krishan Gopal
Y1  - 2018/08/01/
N2  - Type IVa pili are bacterial appendages involved in diverse physiological processes, including electron transfer in Geobacter sulfurreducens. ATP hydrolysis coupled with conformational changes powers the extension (PilB) and retraction (PilT) motors in the pilus machinery. We report the unliganded crystal structures of the core ATPase domain of PilB and PilT-4 from G. sulfurreducens at 3.1 and 2.6 Å resolution, respectively. PilB structure revealed three distinct conformations, that is, open, closed, and open' which were previously proposed to be mediated by ATP/ADP binding. PilT-4 subunits, on the other hand, were observed in the closed state conformation. We further report that both PilB and PilT-4 hexamers have two high-affinity ATP-binding sites. Comparative structural analysis and solution data presented here supports the "symmetric rotary model" for these ATPase motors. Our data further suggest that pores of these motors rotate either clockwise or counterclockwise to facilitate assembly or disassembly of right-handed or left-handed pilus.
PB  - Wiley
JF  - The FEBS journal
VL  - 285
KW  - Structural data are available in the RCSB PDB database under the PDB ID 5ZFQ (PilT-4)
KW  -  5ZFR (PilB).
SN  - 1742-4658
TI  - Structural insights into the mechanism of Type IVa pilus extension and retraction ATPase motors.
SP  - 3402
EP  - 3421
ER  -