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Table 3. Results of the toxicity assays for all the cysteine mutants of PA
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First assay |
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Defective |
Active |
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Second assay |
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Defective |
Not expressed |
Active |
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Domain 1 |
I210, K225, T240, K245 |
D177, D179, D181, G182, I183, D185, E188, G191, Y192, R200, F202, W206, Y219, S221, P223, W226, S227, T228, A229, D231, Y233, S234, D235, F236, K238, G241, D244, H253 |
T169, S170, G172, P184, L187, V189, E190, D195, K197, T201, L203, I207, H211, K214, G215, S222, S230, P232, R242, V247, A251, R252 |
S168, A171, P173, T174, V175, P176, R178, N180, S186, T193, V194, V196, N198, K199, S204, P205, S208, N209, E212, K213, L216, T217, K218, K220, E224, E237, V239, I243, N246, S248, P249, E250 |
Domain 2 |
S337, G342, W346, T357, I364, P379, T380, S382, T390, T393, K397, N399, Y411, I419, A420, N422, F427, S428, D451, D453, V455, N458 |
P254, Y259, P260, V264, I270, K273, H304, I316, G318, I334, L338, R344, E348, N353, R359, N361, N363, R365, Y366, V367, N368, G370, P373, Y375, V384, L391, I394, K395, A396, Q400, S402, Q403, L405, P407, P412, P418, Q424, D425, D426, I432, T433, N435, Q447, Q454, G457, A460, W477, E479, I484 |
L255, A257, A258, I269, S272, N274, T279, N281, T282, S284, T286, I289, S290, H310, A311, S312, F313, F314, G317, S319, A347, A355, L383, Q389, A406, A417, L421, A423, S429, P431, M434, R468, V469, R470, V471, G474, S475, N476, S478, Q483 |
V256, I261, V262, H263, D265, M266, E267, N268, L271, E275, D276, Q277, S278, Q280, D283, E285, R287, T288, K291, N292, T293, S294, T295, S296, R297, T298, H299, T300, S301, E302, V303, G305, N306, A307, E308, V309, D315, V320, S321, A322, G323, F324, S325, N326, S327, N328, S329, S330, T331, V332, A333, D335, H336, S339, L340, A341, E343, T345, T349, M350, G351, L352, T354, D356, A358, L360, A362, T369, T371, A372, I374, N376, V377, L378, T381, L385, G386, K387, N388, A392, E398, L401, I404, N408, N409, Y410, S413, K414, N415, L416, T430, Y436, N437, Q438, F439, L440, E441, L442, E443, K444, T445, K446, L448, R449, L450, T452, Y456, I459, T461, Y462, N463, F464, E465, N466, G467, D472, T473, V480, L481, P482, Q485, E486, T487 |
Domain 3 |
E515 |
T488, R503, T522, L523, D546, I547, Q560, N573, Y575, V577, L590, R592 |
A489, E502, A506, P510, D512, P513, L514, T517, K518, P519, Q541, K563, A585, K586, D593 |
R490, I491, I492, F493, N494, G495, K496, D497, L498, N499, L500, V501, R504, I505, A507, V508, N509, S511, T516, D520, M521, K524, E525, A526, L527, K528, I529, A530, F531, G532, F533, N534, E535, P536, N537, G538, N539, L540, Y542, Q543, G544, K545, T548, E549, F550, D551, F552, N553, F554, D555, Q556, Q557, T558, S559, N561, I562, N564, Q565, L566, A567, E568, L569, N570, A571, T572, I574, T576, L578, D579, K580, I581, K582, L583, N584, M587, N588, I589, I591, K594, R595 |
Domain 4 |
I656, N657, I665, N682, D683, L687 |
F596, Y598, G606, Y642, G651, L668, I676, K680, Y694, Y699, E704, I724 |
A607, E609, V612, K613, V619, I620, D632, E645, L652, V655, R659, Y660, Q670, K673, K679, Y681, P686, A700, V701, K703, N705, I708, P710, I726, F727, G735 |
H597, D599, R600, N601, N602, I603, A604, V605, D608, S610, V611, E614, A615, H616, R617, E618, N621, S622, S623, T624, E625, G626, L627, L628, L629, N630, I631, K633, D634, I635, R636, K637, I638, L639, S640, G641, I643, V644, I646, E647, D648, T649, E650, K653, E654, D658, D661, M662, L663, N664, S666, S667, R669, D671, G672, T674, F675, D677, F678, K684, L685, Y688, I689, S690, N691, P692, N693, K695, V696, N697, V698, T702, T706, I707, N709, S711, E712, N713, G714, D715, T716, S717, T718, N719, G720, I721, K722, K723, L725, S728, K729, K730, G731, Y732, E733, I734 |
Cysteine mutants at the indicated residues are sorted according to their behavior in two successive toxicity assays fully described in Material and Methods. Mutants inactive in a first assay were subjected to a second one, and the expression level of mutants inactive in this second assay was assayed by Western blot. Some mutants (underlined residues) were directly tested in the second assay, either because they were only obtained as we were performing the second assay (A417, R468, Q541, A700, I708, and P710) or because the bacteria expressing them, for unknown reasons, reproducibly did not lyse in the presence of T7 phage (I289, S319, V655, K703, N705, and G735).