Functional properties of plant membrane transport
proteins (ion channels, carriers and pumps) and their role in signal transduction
and nutrition; calcium and pH homeostasis.
Involvement in teaching graduate level courses on membrane
transport and signal transduction (University of York, UK; NCSU); NSCORT
teacher training workshop; training and supervision of undergraduate,
graduate and postdoctoral students.
Johannes, E. & Felle, H. (1987) Implications
for cytoplasmic pH, proton motive force, and amino-acid transport across
the plasmalemma of Riccia fluitans. Planta 172: 53-59.
Johannes, E. & Felle, H. (1990) Proton gradient across the
tonoplast of Riccia fluitans as a result of the joint action of two electroenzymes.
Plant Physiol. 93: 412-417.
Johannes, E., Brosnan, J. M. & Sanders, D. (1992) Parallel pathways
for intracellular Ca2+ release from the vacuole of higher plants. Plant
J. 2: 97-102.
Johannes, E. & Sanders, D. (1995) Lumenal calcium modulates
unitary conductance and gating of a plant vacuolar calcium-release channel.
J. Membr. Biol. 146: 211-224.
Johannes, E., Crofts, A. & Sanders, D. (1998) Control of Cl-
efflux in Chara chorallina by cytosolic pH, free Ca2+, and phosphorylation
indicates a role of plasma membrane anion channels in cytoplasmic pH regulation.
Plant Physiol. 118:173-181.
Moyen, C., Hammock-Kosack, K.E., Jones J., Knight, M. & Johannes,
E. (1998) Systemin triggers an increase of cytoplasmic calcium in
tomato mesophyll cells: Ca2+ mobilization from intra-and extracellular
compartments. Plant Cell Environ. 21:1101-1111.
BBSRC (Biological and Biotechnological Sciences Research Council) Research
Fellow at the University of York, UK (1992-1997)
Dr. rer. nat.,
University of Giessen, Germany, 1989
Biology Diploma - University of Giessen, Germany, 1985
Telephone: (919) 515 3525
Fax: (919) 515 3436