## What does a low Km mean enzyme?

It indicates the affinity of an enzyme for a given substrate: the lower the KM value, the higher the affinity of the enzyme for the substrate.

### Is low Km good enzyme?

That’s sort of how enzymes work. The less substrate they need to reach half of their maximum speed, the more efficient they are. So if the Km is low, you have a really efficient enzyme. If the Km is high, the enzyme is much less efficient.

#### What are Vmax and Km for the enzyme?

Vmax is the maximum rate of an enzyme catalysed reaction i.e. when the enzyme is saturated by the substrate. Km is measure of how easily the enzyme can be saturated by the substrate. Km and Vmax are constant for a given temperature and pH and are used to characterise enzymes.

What does high Km mean?

low affinity
An enzyme with a high Km has a low affinity for its substrate, and requires a greater concentration of substrate to achieve Vmax.”

What is a good Km value?

For most enzymes, KM lies between 10^-1 and 10^-7 M. The KM value for an enzyme depends on the particular substrate and on environmental conditions such as pH, temperature, and ionic strength.

## What does a high Michaelis constant mean?

The value of the Michaelis constant is numerically equal to the at which the reaction rate is at half-maximum, and is a measure of the substrate’s affinity for the enzymeâ€”a small indicates high affinity, meaning that the rate will approach with lower than those reactions with a larger .

### What does Vmax tell us about an enzyme?

Vmax is the reaction rate when the enzyme is fully saturated by substrate, indicating that all the binding sites are being constantly reoccupied.

#### What is a high Km value?

The value of KM is inversely related to the affinity of the enzyme for its substrate. High values of KM correspond to low enzyme affinity for substrate (it takes more substrate to get to Vmax ). Low KM values for an enzyme correspond to high affinity for substrate.

How does enzyme concentration affect Km?

If the enzyme concentration is too high, these conditions may be violated. Km is the concentration of substrate at which the enzyme will be running at “half speed”. If you doubled the amount of enzyme, sure the Vmax is going to increase. If you doubled the amount of enzyme, sure the Vmax is going to increase.

What does a higher Km value mean?

low enzyme affinity for substrate
The value of KM is inversely related to the affinity of the enzyme for its substrate. High values of KM correspond to low enzyme affinity for substrate (it takes more substrate to get to Vmax ). Low KM values for an enzyme correspond to high affinity for substrate.

## What does high km mean?

low enzyme affinity for