Protein Functions

Defends against invaders,

prevent or minimize damage subsequent to injuries.

antibodies or immunoglobulin (glycoprotein), fibrinogen and thrombin,

antiviral agents such as interferon & tumor necrosis factor (TNF).

Contractile or Motor Function

actin and myosin, kinesin and tubulin

Enzymes

fatty acid synthetase, lactate dehydrogenase, sucrase

Hormonal Proteins

insulin, oxytocin, & somatotropin

support and shape

keratin, collagen, cellulose, fibrin & elastin.

Signalling

GTPases

Facilitates Transport of ions or molecules

cytochrome C

haemoglobin

myoglobin

serum albumin

Provides a reservoir of nitrogen and other nutrients

Ferritin, Ovalbumin, Casein

Control and coordination of functions and activities

insulin, transmission of hereditary characteristics (nucleoproteins)