Individual differences | Methods | Statistics | Clinical |
Educational | Industrial | Professional items | World psychology
| A membrane protein is a protein molecule that is attached to,
or associated with the membrane of a cell or an organelle. More
than half of all proteins interact with membranes. Membrane
proteins can be classified into two groups, based on the
strength of their association with the membrane. Integral
membrane proteins are permanently attached to the membrane. They
can be defined as those proteins which require a detergent (such
as SDS or Triton X-100) or some other apolar solvent to be
displaced. They can be classified according to their
relationship with the bilayer: - Transmembrane proteins span the
entire membrane. The transmembrane regions of the proteins are
either beta-barrels or alpha-helical. The alpha-helical domains
are present in all types of biological membranes including outer
membranes. The beta-barrels were found only in outer membranes
of Gram-negative bacteria, cell wal