Sequence-Specific and Phosphorylation-Dependent Proline Isomerization: A Potential Mitotic Regulatory Mechanism

Author:

Yaffe Michael B.12345,Schutkowski Mike12345,Shen Minhui12345,Zhou Xiao Zhen12345,Stukenberg P. Todd12345,Rahfeld Jens-Ulrich12345,Xu Jian12345,Kuang Jian12345,Kirschner Marc W.12345,Fischer Gunter12345,Cantley Lewis C.12345,Lu Kun Ping12345

Affiliation:

1. M. B. Yaffe, Division of Signal Transduction, Department of Medicine and Department of Surgery, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA.

2. M. Schutkowski, J.-U. Rahfeld, G. Fischer, Max-Planck Research Unit on Enzymology of Protein Folding, Kurth-Mothes Strasse 3, 06120 Halle, Germany.

3. M. Shen and X. Z. Zhou, Cancer Biology Program, Division of Hematology and Oncology, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA.

4. P. T. Stukenberg and M. W. Kirschner, Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.

5. J. Xu, Division of Signal Transduction, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA.

Abstract

Pin1 is an essential and conserved mitotic peptidyl-prolyl isomerase (PPIase) that is distinct from members of two other families of conventional PPIases, cyclophilins and FKBPs (FK-506 binding proteins). In response to their phosphorylation during mitosis, Pin1 binds and regulates members of a highly conserved set of proteins that overlaps with antigens recognized by the mitosis-specific monoclonal antibody MPM-2. Pin1 is here shown to be a phosphorylation-dependent PPIase that specifically recognizes the phosphoserine-proline or phosphothreonine-proline bonds present in mitotic phosphoproteins. Both Pin1 and MPM-2 selected similar phosphorylated serine-proline–containing peptides, providing the basis for the specific interaction between Pin1 and MPM-2 antigens. Pin1 preferentially isomerized proline residues preceded by phosphorylated serine or threonine with up to 1300-fold selectivity compared with unphosphorylated peptides. Pin1 may thus regulate mitotic progression by catalyzing sequence-specific and phosphorylation-dependent proline isomerization.

Publisher

American Association for the Advancement of Science (AAAS)

Subject

Multidisciplinary

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