Clinical Chem Enzymology

Enzymes are biological catalyst that increases the rate of a biochemical reaction

What are enzymes?

No

Do enzymes undergo permanent changes or be consumed after a reaction? Yes/No

proteins

Most enzymes are ______ or conjugated ______

specific

Enzymes are extremely s______

temperature, pH, enzyme concentration, substrate concentration

Name four enzyme reaction conditions

40C

Optimal temperature for most enzymes are under ___

affect, inactivate

change in pH affects the ionisation state of acidic or basic amino acids
This changes the structure and shape of enzyme → ______ or _____ enzyme activity

active sites

Increasing enzyme substrate means an increase in __________ to convert substrate molecules into products
However, limiting point might reach so theres needs to have an excess of substrate

product

An increase in substrate concentration means an increased rate of _____ formation, at a constant enzyme concentration

limiting point

rate of product formation is linear & proportional to the substrate concentration, until a __________ is reached

glycoprotein

Alkaline Phosphatase is membrane-bound ________ on the outer layer of cell
membrane

membranes and cell surfaces of small intestine, kidneys, liver, bone & placenta

Where is Alkaline Phosphatase found on?

Any of three:
catalyses the hydrolysis of phosphate monoesters at alkaline pH

releases inorganic phosphate from the substrate

requires divalent cations as cofactors

only found in the tissues under normal physiological condition

increased production under specific condition may release it into circulation

Name 3 functions of alkaline phosphatase

alkaline phosphatase

hepatobiliary disorders: ___________ + other markers of hepatic function

bone isoenzyme

elevated serum level is common in osteoblast-related disorders

liver isoenzyme

primary or metastatic cancer with local bile duct obstruction & increasing leakage of _________

oxidoreductase, anaerobic

Lactate Dehydrogenase is an _________ important in ________ metabolic pathway

almost all tissue, but significant level in heart, skeletal muscle, liver & kidneys

Where is Lactate Dehydrogenase present in?

cytoplasm

Lactate Dehydrogenase has higher concentration in the ________ than serum

involved in the anaerobic metabolism of glucose when there is an absence or limited supply of oxygen in tissues

catalyses the reversible conversion of pyruvate to lactate, with the use of NADH

lactate is transported to the liver
reversibly converting lactate to pyruvate

Functions of Lactate Dehydrogenase