UPDATE 4-BES shareholder seeks creditor protection, woes spill to Angolan unit
* Espirito Santo family holding can't pay debts, wants controlled assets sale
* Angola central bank says BES's Angola unit needs capital increase
* Says unit needs capital to address 'bad' credit operations
* Portugal central bank says private investors could help BES (Recasts with filing for creditor protection)
By Shrikesh Laxmidas and Andrei Khalip
LISBON, July 18 (Reuters) - One of the holding companies of Portugal's Espirito Santo banking clan filed for creditor protection in Luxembourg on Friday and the business empire's problems also spilled over to Angola where the central bank said the local unit of Banco Espirito Santo would need more capital to deal with bad loans.
Banco Espirito Santo (BES), Portugal's largest-listed lender, is under scrutiny from investors and regulators after disclosures of financial irregularities at Espirito Santo International, or ESI, the entity that sought creditor protection.
Its problems have raised the possibility of destabilising losses at the bank. ESI, which is registered in Luxembourg, indirectly holds the largest stake in BES, at 20.1 percent.
ESI said it is "currently not able to meet its debt obligations, a material portion of which have matured". Continuación...