TY - JOUR
T1 - A monoclonal antibody that blocks adhesion of chlamydomonas mt+ gametes
AU - Snell, W. J.
AU - Kosfiszer, M. G.
AU - Clausell, A.
AU - Perillo, N.
AU - Imam, S.
AU - Hunnicutt, G.
PY - 1986/12/1
Y1 - 1986/12/1
N2 - During the mating reaction (fertilization) in the biflagellated alga, Chlamydomonas reinhardtii, m+ and mt− gametes adhere to each other via their flagella and subsequently fuse to form quadriflagellated zygotes. In the studies reported here, we describe a monoclonal antibody directed against an mt + flagellar surface molecule. The antibody blocks the adhesiveness of mt + gametes, isolated mt+ flagella, and detergent extracts thereof. It has no effect on mt− gametes. Cyanogen bromide-activated Sepharose beads derivatized with the antibody bind only mt+ gametes; mt− gametes and mt+ and mt− vegetative cells are unreactive with the derivatized beads. The interaction of mt+ gametes with the beads is dynamic and cells continuously bind, detach, and rebind to the beads. Surprisingly, antibody-derivatized beads that have been incubated with mt+ gametes acquire the ability to bind mt− gametes. Moreover, extraction of the preincubated beads with detergents releases active mt+ adhesion molecules. The evidence suggests that binding of the antibody to the flagellar surface adhesion molecules causes their release from the flagellar surface, possibly mimicking the normal mechanism of flagellar de-adhesion.
AB - During the mating reaction (fertilization) in the biflagellated alga, Chlamydomonas reinhardtii, m+ and mt− gametes adhere to each other via their flagella and subsequently fuse to form quadriflagellated zygotes. In the studies reported here, we describe a monoclonal antibody directed against an mt + flagellar surface molecule. The antibody blocks the adhesiveness of mt + gametes, isolated mt+ flagella, and detergent extracts thereof. It has no effect on mt− gametes. Cyanogen bromide-activated Sepharose beads derivatized with the antibody bind only mt+ gametes; mt− gametes and mt+ and mt− vegetative cells are unreactive with the derivatized beads. The interaction of mt+ gametes with the beads is dynamic and cells continuously bind, detach, and rebind to the beads. Surprisingly, antibody-derivatized beads that have been incubated with mt+ gametes acquire the ability to bind mt− gametes. Moreover, extraction of the preincubated beads with detergents releases active mt+ adhesion molecules. The evidence suggests that binding of the antibody to the flagellar surface adhesion molecules causes their release from the flagellar surface, possibly mimicking the normal mechanism of flagellar de-adhesion.
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U2 - 10.1083/jcb.103.6.2449
DO - 10.1083/jcb.103.6.2449
M3 - Article
C2 - 3782303
AN - SCOPUS:0022976860
SN - 0021-9525
VL - 103
SP - 2449
EP - 2456
JO - Journal of Cell Biology
JF - Journal of Cell Biology
IS - 6
ER -