Table 3 Amino acid residues involved in the establishment of PamTps1 active site pocket and catalysis activity predicted using CASTp and InterProScan.
Structure/Motif | Residues | Functions |
|---|---|---|
N-terminal domain (RRx8W) | R1R2S3G4N5Y6Q7P8SAW | Active site lid |
A–C loop (RxR) | R259DR | Active site lid |
R259—Hydrogen bond donor | ||
Helix C | W268, Y272 | Active site pocket |
W268—Aromatic residue surrounding non-polar hydrocarbon of substrate | ||
W268, Y272—Hydrophobic interaction with PPi | ||
Helix D1 | I288V289, L291V292T293 | Active site pocket |
V289, V292T293—Hydrophobic interaction with PPi | ||
Helix D1(DDxxD) | D296D297VY299D300 | Active site pocket |
D296, D300—metal binding motif | ||
Helix F | F371, E374A375, Y378Y379 | Active site pocket |
Helix G1 | T396 | Active site pocket |
Turn | I397A398 | Active site pocket, hydrophobic interaction with PPi |
Helix G2 | A399, A401A402 | Active site pocket |
A399, A402—Hydrophobic interaction with PPi | ||
Helix H (L,V)(V,L,A)(N,D)D(L,I,V)x(S,T)xxxE/DTE | L436R437L438AD440D441LG | F447E448, E450- Active site lid |
Active site pocket | ||
R437—Hydrogen bond donor | ||
T444APF447E448, E450 | D440, T444, E448 – metal binding motif | |
L436—Hydrophobic interaction with PPi | ||
H-α1 loop | R451G452D453V454A455 | Active site lid |
K456A457, V458 | K456—Hydrogen bond donor | |
310 helix | Y517 | Active site pocket, hydrophobic interaction with PPi |
J-K loop | G520D521G522Y523G524V525 | Active site lid |
Y523—Aromatic residue surrounding non-polar hydrocarbon of substrate/Hydrophobic interaction with PPi |
