  We propose a tight-binding model to investigate electronic transport
properties of single helical protein molecules incorporating both the helical
symmetry and the possibility of multiple charge transfer pathways. Our study
reveals that due to existence of both the multiple charge transfer pathways and
helical symmetry, the transport properties are quite rigid under influence of
envi- ronmental fluctuations which indicates that these biomolecules can serve
as better alternatives in nanoelectronic devices than its other biological
counterparts e.g., single-stranded DNA.
