What is the function of cyclophilin a?

What is the function of cyclophilin a?

Cyclophilins (CYPs) are a family of proteins named after their ability to bind to ciclosporin (cyclosporin A), an immunosuppressant which is usually used to suppress rejection after internal organ transplants. They are found in all domains of life.

Where is cyclophilin found?

The 18-kDa archetypal cyclophilin CypA is cytosolic and found in all tissues in mammals, whereas other cyclophilins, whether they have a CLD alone or in combination with other domains, are found in the endoplasmic reticulum (ER), the mitochondria, or the nucleus.

What does FK506 mean?


FKBP-type peptidyl-prolyl cis-trans isomerase
The human protein FKBP12 bound to FK506 (tacrolimus). The protein surface is colored by hydrophobicity; the deep cleft in which the ligand is bound is hydrophobic.
Symbol FKBP_C
Pfam PF00254

What is the mechanism of action of cyclosporine?

Cyclosporine is a potent immunomodulatory agent with an increasing number of clinical applications. Its major mode of action is inhibition of the production of cytokines involved in the regulation of T-cell activation. In particular, cyclosporine inhibits the transcription of interleukin 2.

Is cyclophilin an enzyme?

Cyclophilins are folding helper enzymes of the class of peptidyl prolyl cis/trans isomerases (PPIases) able to catalyze the cis/trans isomerization of peptide bonds N-terminal to proline [8].

What does Fkbp stand for?

Abstract. FK506 binding proteins (FKBPs) are a family of highly conserved proteins in eukaryotes. The prototype of this protein family, FKBP12, is the binding partner for immunosuppressive drugs FK506 and rapamycin.

How does cyclosporine suppress the immune system?

Cyclosporine inhibits immune system function. Specifically, it temporarily reduces the activity of cells in the immune system called lymphocytes, such as T helper cells and T suppressor cells. Cyclosporine also reduces how much enzyme interleukin-2 (IL-2) the body produces. IL-2 regulates white blood cell activity.

Is cyclosporine A the same as cyclosporine?

Ciclosporin is the INN and the British Approved Name (BAN), while cyclosporine is the United States Adopted Name (USAN) and cyclosporin is a former BAN.

How is isomerase used in industry?

Glucose isomerase is an industrially important enzyme due to its application in the production of high-fructose corn syrup, as well as in the fructose production by isomerization of glucose to fructose, which is applied as an alternative to cane sugar (Bhosale et al., 1996; Olsen, 2002).

What does FKBP12 stand for?

Abstract. The FK506-binding protein 12 (FKBP12) is a cytoplasmic protein and has been reported to possess multiple functions in signaling transduction based on its interaction with different cellular targets.

What is FK in Fkbp?

INTRODUCTION. FK506 binding proteins (FKBPs) are a large family of proteins that possess peptidyl prolyl cis/trans isomerase (PPIase) domains.

What are cyclophilins?

Cyclophilins constitute a subgroup of large family of proteins called immunophilins, which also include FKBPs and Parvulins. They are remarkably conserved in all genera, highlighting their pivotal role in important cellular processes.

Why are cyclophilins considered chaperones?

Most cyclophilins display PPIase enzymatic activity, multiplicity, diverse cellular locations and active role in protein folding which render them to be included in the class of diverse set of proteins called molecular chaperones.

Where is cyclophilin found in the cell membrane?

The protein belongs to a family of isozymes, including cyclophilins B and C, and natural killer cell cyclophilin-related protein. Major isoforms have been found within single cells, including inside the Endoplasmic reticulum, and some are even secreted .

Do all cyclophilins have PPIase activity?

Not all cyclophilin proteins possess PPIase activity, indicating a loss of their PPIase activity during the course of evolution and gain of function independent of their PPIase activity. The PPIase function of cyclophilins is also compensated by their functional homologs, like FKBPs.