In Spain a "procurador" is a court representative; "court agent" is also a possible translation. However, in Peru a "procurador público" is really the same thing as an "abogado del estado": a lawyer or attorney who acts for the state or for state institutions:

"El Procurador Público es un funcionario que por mandato constitucional, en el artículo ejerce la defensa de los intereses del Estado, Gobiernos Regionales, Organismos Constitucionales autónomos y demás dependencias del Estado. Resulta siendo el Abogado del Estado y defiende a las entidades del Estado en los Juicios que ellas promueven contra terceros o que se promueven contra este."
http://www.monografias.com/trabajos16/procuradores-publicos-...

Note "o que se promueven contra este": the procurador público is not a prosecutor; he/she also defends the state and its institutions in court. The term means a government attorney or state attorney. In the UK the equivalent term would be "treasury counsel": a barrister who acts for the government. In this previous question on "abogado del estado" (which is really the same thing, as the text quoted above indicates), "state lawyer" was the accepted answer, and this would be OK, but I think "attorney" would be better than "lawyer", which is a very general term.
http://www.proz.com/kudoz/spanish_to_english/law_general/349...

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Note added at 1 hr (2012-11-05 22:39:49 GMT)
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"Peru’s state attorney for counter-terrorism, Julio Galindo, appealed Berenson's parole"
http://en.wikipedia.org/wiki/Lori_Berenson

"El procurador público para delitos de terrorismo Julio Galindo criticó duramente al Poder Judicial por facilitar la salida del país de la emerretista Lori Berenson"
http://www.facebook.com/AbrelosOjosFL/posts/266795126710605?...

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Note added at 13 hrs (2012-11-06 10:34:08 GMT)
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There is a distinction between a public prosecutor and a state or government attorney (although in some US states a public prosecutor is called a state attorney). The former works for the public prosecutor's office and conducts the prosecution, on behalf of the state, in criminal cases. In England a public prosecutor is called a crown prosecutor and works for the Crown Prosecution Service, headed by the Director of Public Prosecutions. In the US a number of terms are used in different states, but the most familiar is District Attorney. The equivalent term in Peru (as in Spain) is fiscal, and the state prosecution service is called the Ministerio Público Fiscalía de la Nación.
http://www.peru.gob.pe/directorio/pep_directorio_detalle_ins...

However, a "procurador público" is different, and corresponds, as I have said (and my first source states) to an "abogado del estado", which is not the same as a "fiscal".

An alternative term to "state attorney" or "government attorney" might by "public attorney", which is used in this US site on the Peruvian legal system. The distinction outlined above is also made here:

"Several other judicial functions are worthy of note. The public prosecutor's office was appointed by the president and was responsible for overseeing the independence of judges and the administration of justice, representing the community at trials, and defending people before the public administration. Public attorneys, who are also appointed by the president, defend the interests of the state. The office of the Public Ministry was made up of the attorney general and attorneys before the Supreme Court of Justice, Superior Courts, and the Courts of First Instance. Public attorneys defended the rights of citizens in the public interest against encroachment by public officials."
http://countrystudies.us/peru/74.htm



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Note added at 13 hrs (2012-11-06 10:39:53 GMT)
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The functions of a Peruvian procurador público are roughly similar to those of the UK's Treasury Solicitor's Department. Interestingly, the Treasury Solicitor is also known as the Procurator General:
http://en.wikipedia.org/wiki/Treasury_Solicitor's_Department

The UK government is represented in court by Treasury Counsel, as I have said. These are not public prosecutors.