Unknown

Dataset Information

0

ATP?S competes with ATP for binding at Domain 1 but not Domain 2 during ClpA catalyzed polypeptide translocation.


ABSTRACT: ClpAP is an ATP-dependent protease that assembles through the association of hexameric rings of ClpA with the cylindrically-shaped protease ClpP. ClpA contains two nucleotide binding domains, termed Domain 1 (D1) or 2 (D2). We have proposed that D1 or D2 limits the rate of ClpA catalyzed polypeptide translocation when ClpP is either absent or present, respectively. Here we show that the rate of ClpA catalyzed polypeptide translocation depends on [ATP?S] in the absence of ClpP, but not in the presence of ClpP. We observe that ATP?S non-cooperatively binds to ClpA during polypeptide translocation with an apparent affinity of ~6 ?M, but that introduction of ClpP shifts this affinity such that translocation is not affected. Interpreting these data with our proposed model for translocation catalyzed by ClpA vs. ClpAP suggests that ATP?S competes for binding at D1 but not at D2.

SUBMITTER: Miller JM 

PROVIDER: S-EPMC3966025 | BioStudies | 2014-01-01

REPOSITORIES: biostudies

Similar Datasets

2013-01-01 | S-EPMC3918674 | BioStudies
2010-01-01 | S-EPMC2871031 | BioStudies
2020-01-01 | S-EPMC7568338 | BioStudies
2019-01-01 | S-EPMC6567684 | BioStudies
2009-01-01 | S-EPMC2781540 | BioStudies
2001-01-01 | S-EPMC31834 | BioStudies
2008-01-01 | S-EPMC4234636 | BioStudies
2001-01-01 | S-EPMC31127 | BioStudies
2020-01-01 | S-EPMC7529148 | BioStudies
2020-01-01 | S-EPMC7707817 | BioStudies