On 2016 Jan 05, Morten Oksvold commented:

Please not that this article contains fraudulent data, which was concluded from an investigation by the University of Alabama at Birmingham in 2009 (!):

http://www.uab.edu/reporterarchive/71570-uab-statement-on-protein-data-bank-issues

The case was recently discussed at Retraction Watch: http://retractionwatch.com/2016/01/04/nature-retracts-paper-six-years-after-it-was-flagged-for-fraud/

PNAS was informed about this case in 2009, but as far as I can see there has still not been published any retraction.

On 2016 Jan 05, Morten Oksvold commented:

Please not that this article contains fraudulent data, which was concluded from an investigation by the University of Alabama at Birmingham in 2009 (!):

http://www.uab.edu/reporterarchive/71570-uab-statement-on-protein-data-bank-issues

The case was recently discussed at Retraction Watch: http://retractionwatch.com/2016/01/04/nature-retracts-paper-six-years-after-it-was-flagged-for-fraud/

PNAS was informed about this case in 2009, but as far as I can see there has still not been published any retraction.