PROTIEN FUNCTION
Protein molecules that assist in the proper folding of other protein
The cap attaches, causing the cylinder to change shape which creates a hydrophilic environment for the polypeptide to fold.
The cap comes off and the properly folded protein is released
An unfolded polypeptide enters the cylinder from one end
STRUCTURAL PROTIEN
cytoskeleton and collagen
used in building structures in an organism
identifies cell shape and locomotion-
plays role in cell division-
movement of vesicles and organelles-from place to place
consists of 3 distinct cytoplasmic filament networks
MICROFILAMENTS (ACTIN FILAMENTS)
Cells are anchored to the extracellular matrix via trans-membrane- protein such as integrins
helps in Muscle contraction & cell locomotion-
INTERMEDITE FILAMENTS
-fine fiber lies between thin & thick muscle filaments
-Consist of α-helical rod & non-helical head & tail
2 basic type of anchoring junction
adherens junctions the cell adhesion molecules are linked to actin microfilaments by linking protein such as catenin-
In desmosomes cell adhesion molecules linked to intermediate filaments(cardiac tissues, epithelial cells)-
Microtubules
protein filaments constituting an integral part of the cytoskeleton of
form mitotic spindles (cell division)
helps in cell motility
principal component is the protein subunit Tubulin (composed of non identical alpha and beta subunits)
Structural function
collagen
insoluble fibrous protein in the extracellular matrix and in
16 types of collagen
consists of type I, II, III and IV
the structure helps tissues withstand stretching
builds keratin for hair and fingernails
produce collagen for skin
builds myosin for muscle development
Chemical function
red blood cells: protein carries oxygen
white blood cells: develop antibodies
hydrogen sulphide: kills bacteria
Energy storage function
-proteins can be degraded into acetyl-CoAand "cycle" the Krebs cycle
Transportation function
membrane channels
respiratory pigments
Informative function
Membrane receptors
-hormones and neuro transmitters
Intracellular signalers
-hunger
Enzymatic function
-synthesis function
Endocrine integration function
-hormone regulation